Stainless Steel Seamless Pipe is one of our more common seamless pipes, so where is the stainless steel seamless pipe used? What is the performance?
In the building water supply piping system, as the galvanized steel pipe has ended a hundred years of glorious history, various new plastic pipes and composite pipes have been developed rapidly, but various pipes still have some shortcomings to varying degrees, which are far from being fully adapted to water supply pipe Department’s needs and the country’s requirements for drinking water and related water quality. Therefore, relevant experts predict: Building water supply pipes will eventually return to the era of metal pipes. According to foreign application experience, a thin-walled stainless steel pipe is recognized as one of the pipes with the best comprehensive performance among the metal pipes.
As the stainless steel seamless pipe is used as a reprocessing device, to control the chromium-carbon compound in the welding affected part as much as possible, the carbon content is reduced, or the content of silicon and phosphorus is limited in 310Nb steel. In addition, in 304ULC steel, to improve the corrosion resistance in nitric acid, the steel industry with a phosphorus content of 0.015% or less is strongly restricted. After repeated 20 times of 65% boiling nitric acid corrosion test, it is found that if the corrosion rate of the solution-treated material is below 0.1mm/a, the sensitized material at 650℃×2h is below 0.2mm/a. , Has excellent corrosiveness. yintuosteel.com
In the building water supply piping system, as the galvanized steel pipe has ended a hundred years of glorious history, various new plastic pipes and composite pipes have been developed rapidly, but various pipes still have some shortcomings to varying degrees, which are far from being fully adapted to water supply pipe Department’s needs and the country’s requirements for drinking water and related water quality. Therefore, relevant experts predict: Building water supply pipes will eventually return to the era of metal pipes. According to foreign application experience, a thin-walled stainless steel pipe is recognized as one of the pipes with the best comprehensive performance among the metal pipes.
As the stainless steel seamless pipe is used as a reprocessing device, to control the chromium-carbon compound in the welding affected part as much as possible, the carbon content is reduced, or the content of silicon and phosphorus is limited in 310Nb steel. In addition, in 304ULC steel, to improve the corrosion resistance in nitric acid, the steel industry with a phosphorus content of 0.015% or less is strongly restricted. After repeated 20 times of 65% boiling nitric acid corrosion test, it is found that if the corrosion rate of the solution-treated material is below 0.1mm/a, the sensitized material at 650℃×2h is below 0.2mm/a. , Has excellent corrosiveness. yintuosteel.com
In many house decoration or construction sites, we can see a variety of Seamless Pipe Manufacturers products.
The seamless pipe can be made into ring parts, which makes the material usage more fully, and the production process becomes simpler, thus shortening the production time, and it is also effective in the production of weapons, such as guns, and steel pipes are indispensable.
The seamless pipe can be divided into two types: round and special-shaped according to the hollow cross-section in the middle. When the circumference is the same, the circular transport liquid is more, and the internal force of the pipe is more balanced. Therefore, we need to use the steel pipe according to the Features used in the appropriate field.
Seamless pipe sees two types of processes, cold rolling, and hot rolling. Cold-rolled steel pipes are more complicated to process than hot-rolled. Normally, the steel pipes need to be three-rolled continuous, and then the pressing method is determined. After processing, It is also necessary to ensure that the outer layer has no cracks before cutting.
There are many uses for seamless pipes. We have to figure out the characteristics of different seamless pipes in actual applications, and then use them in the right place to maximize their effectiveness. yintuosteel.com
The seamless pipe can be made into ring parts, which makes the material usage more fully, and the production process becomes simpler, thus shortening the production time, and it is also effective in the production of weapons, such as guns, and steel pipes are indispensable.
The seamless pipe can be divided into two types: round and special-shaped according to the hollow cross-section in the middle. When the circumference is the same, the circular transport liquid is more, and the internal force of the pipe is more balanced. Therefore, we need to use the steel pipe according to the Features used in the appropriate field.
Seamless pipe sees two types of processes, cold rolling, and hot rolling. Cold-rolled steel pipes are more complicated to process than hot-rolled. Normally, the steel pipes need to be three-rolled continuous, and then the pressing method is determined. After processing, It is also necessary to ensure that the outer layer has no cracks before cutting.
There are many uses for seamless pipes. We have to figure out the characteristics of different seamless pipes in actual applications, and then use them in the right place to maximize their effectiveness. yintuosteel.com
A seamless pipe is long steel with a hollow section and no joints on the periphery. So today we will take a look at the product features and cold rolling process of Seamless Pipe Manufacturers .
First of all, the thicker the wall thickness of a seamless pipe, the more economical and practical it is. The thinner the wall thickness, its processing cost will rise significantly; secondly, the process of the product determines its limited performance. The seamless steel pipe has low precision: uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pits and black spots on the inside and outside that are not easy to remove; finally, its detection and shaping must be processed offline. Therefore, it embodies its superiority in terms of high-pressure, high-strength, and mechanical structural materials.
The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than that of hot-rolled (extruded seamless steel pipe). The first three steps of their production process are the same. The difference starts from the fourth step. After the round tube blank is emptied, it needs to be headed and annealed. After annealing, use a special acid liquid for pickling. After pickling, apply oil. Then it is followed by multiple passes of cold drawing (cold rolling) and then billeting, and special heat treatment. After heat treatment, it will be straightened. yintuosteel.com
First of all, the thicker the wall thickness of a seamless pipe, the more economical and practical it is. The thinner the wall thickness, its processing cost will rise significantly; secondly, the process of the product determines its limited performance. The seamless steel pipe has low precision: uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pits and black spots on the inside and outside that are not easy to remove; finally, its detection and shaping must be processed offline. Therefore, it embodies its superiority in terms of high-pressure, high-strength, and mechanical structural materials.
The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than that of hot-rolled (extruded seamless steel pipe). The first three steps of their production process are the same. The difference starts from the fourth step. After the round tube blank is emptied, it needs to be headed and annealed. After annealing, use a special acid liquid for pickling. After pickling, apply oil. Then it is followed by multiple passes of cold drawing (cold rolling) and then billeting, and special heat treatment. After heat treatment, it will be straightened. yintuosteel.com
Super Austenitic Stainless Steel Seamless Pipe and Tube are hot-rolled and cold-rolled seamless steel pipes made of stainless steel for corrosion-resistant pipes and structural parts and parts. They are widely used in chemical, petroleum, textile, medical, food, machinery, and other industries.
Due to the oxidation resistance of stainless steel, there is less iron scale when heated. However, the iron oxide scale contains chromium and nickel oxides, and it is very dense, and it is difficult to pickle during cold working.
Ferritic, austenitic-ferritic, and austenitic stainless steels tend to stick to the rolls during the rolling process, which reduces the surface quality of the steel pipe. Cast iron rolls used in hot rolling finishing mills can reduce roll sticking. In addition, it is also very important to use cooling water to cool the roll reasonably.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is committed to producing high-quality Austenitic Stainless Steel Seamless Pipe such as pipes. For more information, please consult us. yintuosteel.com
Due to the oxidation resistance of stainless steel, there is less iron scale when heated. However, the iron oxide scale contains chromium and nickel oxides, and it is very dense, and it is difficult to pickle during cold working.
Ferritic, austenitic-ferritic, and austenitic stainless steels tend to stick to the rolls during the rolling process, which reduces the surface quality of the steel pipe. Cast iron rolls used in hot rolling finishing mills can reduce roll sticking. In addition, it is also very important to use cooling water to cool the roll reasonably.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is committed to producing high-quality Austenitic Stainless Steel Seamless Pipe such as pipes. For more information, please consult us. yintuosteel.com
With the continuous improvement of the understanding of Duplex Stainless Steel Pipe and the continuous improvement of production level, China’s duplex stainless steel pipe has made great progress and progress in terms of output, steel type and variety in recent years.
China’s duplex stainless steel pipes have gotten rid of the situation of small output and single variety around 2000. While the output continues to increase, the varieties are gradually diversified.
On this basis, the market expansion of China’s duplex stainless steel pipes has also made significant development. China’s duplex stainless steel pipes have moved away from being mainly used in petrochemical and other single industries and gradually expanded to petrochemical, chemical transportation, nuclear power, marine and other applications In addition, China’s duplex stainless steel pipes are also constantly going out of China to open up overseas markets.
Combining with the development of duplex stainless steel pipes in the world and in China, according to the actual situation in China, we will discuss several future development directions:
1) High-quality, continuously improving market competitiveness by improving steel purity and product quality.
2) Low cost, through process optimization and fine control of ingredients, cost control and market competitiveness are improved.
3) Multi-alloying and customization of steel design.
4) The research is more in-depth and refined. On the basis of the previous research, a more in-depth study on the precipitation and control of the second phase was carried out, and the fine control of the phase ratio and morphology was gradually realized.
5) According to the national strategy, continue to expand the application of duplex stainless steel in China.
As a stainless steel seamless pipe manufacturers, Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. will also continue to develop to provide customers with higher quality stainless steel seamless pipes. For more details, please contact us: https://www.yintuosteel.com/product/ferritic-austenitic-duplex/duplex-stainless-steel-seamless-pipe-and-tube.html
China’s duplex stainless steel pipes have gotten rid of the situation of small output and single variety around 2000. While the output continues to increase, the varieties are gradually diversified.
On this basis, the market expansion of China’s duplex stainless steel pipes has also made significant development. China’s duplex stainless steel pipes have moved away from being mainly used in petrochemical and other single industries and gradually expanded to petrochemical, chemical transportation, nuclear power, marine and other applications In addition, China’s duplex stainless steel pipes are also constantly going out of China to open up overseas markets.
Combining with the development of duplex stainless steel pipes in the world and in China, according to the actual situation in China, we will discuss several future development directions:
1) High-quality, continuously improving market competitiveness by improving steel purity and product quality.
2) Low cost, through process optimization and fine control of ingredients, cost control and market competitiveness are improved.
3) Multi-alloying and customization of steel design.
4) The research is more in-depth and refined. On the basis of the previous research, a more in-depth study on the precipitation and control of the second phase was carried out, and the fine control of the phase ratio and morphology was gradually realized.
5) According to the national strategy, continue to expand the application of duplex stainless steel in China.
As a stainless steel seamless pipe manufacturers, Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. will also continue to develop to provide customers with higher quality stainless steel seamless pipes. For more details, please contact us: https://www.yintuosteel.com/product/ferritic-austenitic-duplex/duplex-stainless-steel-seamless-pipe-and-tube.html
How to classify stainless steel pipes?
2021年4月29日 日常1. Stainless steel pipes can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series) and precipitation hardening series (600 series) according to their composition.
2. Stainless steel pipes are divided into seamless pipes and welded pipes according to the production method. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold-drawn and cold-rolled pipes are steel pipes. Secondary processing; welded pipes are divided into straight seam welded pipes and spiral welded pipes.
3. Stainless steel pipes can be divided into round pipes and special-shaped pipes according to the cross-sectional shape. Special-shaped tubes include rectangular tubes, rhombus tubes, oval tubes, hexagonal tubes, octagonal tubes, and various asymmetrical cross-section tubes. Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to the shape of the longitudinal section. Variable section tubes include tapered tubes, stepped tubes and periodic section tubes.
4. Stainless steel pipes can be divided into smooth pipes and threaded pipes (threaded steel pipes) according to the state of the pipe ends. The threaded pipe can be divided into the ordinary threaded pipe (pipes for conveying water, gas and other low pressure, which are connected by ordinary cylindrical or tapered pipes) and special threaded pipes (pipes for petroleum and geological drilling. For important threaded pipes, use Special thread connection). For some special pipes, in order to compensate for the influence of the thread on the strength of the pipe end, the pipe end is usually thickened (internal thickening, external thickening or internal and external thickening) before turning the wire.
5. According to the purpose, it can be divided into oil well pipe (casing, oil pipe and drill pipe, etc.), line pipe, boiler pipe, mechanical structure pipe, hydraulic prop pipe, gas cylinder pipe, geological pipe, chemical pipe (high-pressure fertilizer pipe, petroleum Cracking pipe) and ship pipes.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd., as a seamless pipe manufacturer, has seamless pipes for sale. If you want to know more about seamless pipes, you can contact us: https://www.yintuosteel.com/
2. Stainless steel pipes are divided into seamless pipes and welded pipes according to the production method. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold-drawn and cold-rolled pipes are steel pipes. Secondary processing; welded pipes are divided into straight seam welded pipes and spiral welded pipes.
3. Stainless steel pipes can be divided into round pipes and special-shaped pipes according to the cross-sectional shape. Special-shaped tubes include rectangular tubes, rhombus tubes, oval tubes, hexagonal tubes, octagonal tubes, and various asymmetrical cross-section tubes. Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to the shape of the longitudinal section. Variable section tubes include tapered tubes, stepped tubes and periodic section tubes.
4. Stainless steel pipes can be divided into smooth pipes and threaded pipes (threaded steel pipes) according to the state of the pipe ends. The threaded pipe can be divided into the ordinary threaded pipe (pipes for conveying water, gas and other low pressure, which are connected by ordinary cylindrical or tapered pipes) and special threaded pipes (pipes for petroleum and geological drilling. For important threaded pipes, use Special thread connection). For some special pipes, in order to compensate for the influence of the thread on the strength of the pipe end, the pipe end is usually thickened (internal thickening, external thickening or internal and external thickening) before turning the wire.
5. According to the purpose, it can be divided into oil well pipe (casing, oil pipe and drill pipe, etc.), line pipe, boiler pipe, mechanical structure pipe, hydraulic prop pipe, gas cylinder pipe, geological pipe, chemical pipe (high-pressure fertilizer pipe, petroleum Cracking pipe) and ship pipes.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd., as a seamless pipe manufacturer, has seamless pipes for sale. If you want to know more about seamless pipes, you can contact us: https://www.yintuosteel.com/
Stainless steel seamless pipe is an iron-based alloy with a mass fraction of 12% to more than 50% alloying elements. Alloying elements affect the stability of austenite, ferrite and martensite phases, thereby affecting the balance between the phases related to stability.
The elements added to the stainless steel tube can be divided into elements that form and stabilize ferrite and elements that form stable austenite. Martensite is a phase transformation product that is formed when austenite is cooled from high temperature to low temperature. If austenite is not formed at high temperatures, then martensite cannot be formed at low temperatures.
Austenitic stainless steel pipes contain high nickel content and other austenite-forming elements, which promote the formation of the austenite phase, making it stable at room temperature or even lower temperatures.
Ferritic stainless steel seamless pipes contain elements that weaken the formation of austenite, such as high chromium content, making ferrite the dominant phase component. The martensitic stainless steel tube is austenitic at high temperatures, but this austenite is suitably unstable and transforms when it is cooled. The microstructure of the stainless steel tube can be controlled by the balance between the austenite forming element and the ferrite forming element. The adjustment of the balance between the two elements plays an important role in the mechanical properties, corrosion resistance and weldability of stainless steel pipes.
The addition of aluminum, titanium, copper and molybdenum to the stainless steel seamless tube can promote the precipitation reaction and strengthen the steel. Austenitic stainless steel seamless tubes often contain titanium and aluminum to form nickel-titanium and nickel-aluminum precipitation phases, which are similar to precipitation strengthening phases in nickel-based superalloys. Aluminum is a ferrite-forming element in solid solution, while copper is a weak austenite-forming element. The precipitated phase with a composition close to pure copper can be used to strengthen martensitic steel.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. produces high-quality austenitic stainless steel seamless tubes. If you need to order seamless pipes and other products, we may be your good partner: https://www.yintuosteel.com/
The elements added to the stainless steel tube can be divided into elements that form and stabilize ferrite and elements that form stable austenite. Martensite is a phase transformation product that is formed when austenite is cooled from high temperature to low temperature. If austenite is not formed at high temperatures, then martensite cannot be formed at low temperatures.
Austenitic stainless steel pipes contain high nickel content and other austenite-forming elements, which promote the formation of the austenite phase, making it stable at room temperature or even lower temperatures.
Ferritic stainless steel seamless pipes contain elements that weaken the formation of austenite, such as high chromium content, making ferrite the dominant phase component. The martensitic stainless steel tube is austenitic at high temperatures, but this austenite is suitably unstable and transforms when it is cooled. The microstructure of the stainless steel tube can be controlled by the balance between the austenite forming element and the ferrite forming element. The adjustment of the balance between the two elements plays an important role in the mechanical properties, corrosion resistance and weldability of stainless steel pipes.
The addition of aluminum, titanium, copper and molybdenum to the stainless steel seamless tube can promote the precipitation reaction and strengthen the steel. Austenitic stainless steel seamless tubes often contain titanium and aluminum to form nickel-titanium and nickel-aluminum precipitation phases, which are similar to precipitation strengthening phases in nickel-based superalloys. Aluminum is a ferrite-forming element in solid solution, while copper is a weak austenite-forming element. The precipitated phase with a composition close to pure copper can be used to strengthen martensitic steel.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. produces high-quality austenitic stainless steel seamless tubes. If you need to order seamless pipes and other products, we may be your good partner: https://www.yintuosteel.com/
The petroleum and petrochemical industry is a pillar industry of the national economy, and it occupies a pivotal position in the national economy. In the past 20 years, the production technology level of stainless steel pipes, whether seamless pipes or welded pipes, has been greatly improved. The stainless steel pipes produced by some Chinese manufacturers have reached a level that can completely replace imported products, realizing the localization of steel pipes.
In the petroleum and petrochemical industry, stainless steel pipes are mainly used in pipeline transportation systems, including high-pressure furnace pipes, piping, petroleum cracking pipes, fluid transmission pipes, heat exchange pipes, etc. Stainless steel is required to perform well in wet and acid service conditions.
In order to adapt to the processing of low-quality crude oil and to meet the requirements of environmental protection, Chinese refining and chemical companies continue to optimize the processing structure of the refining unit and adjust the product structure. Among them, high-pressure hydrogenation units such as hydrocracking and hydroprocessing have developed rapidly in recent years. The processing capacity of the unit is It is also constantly improving.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. also keeps pace with the times and produces austenitic stainless steel seamless tube, ferritic stainless steel seamless pipe and tube and other kinds of seamless steel tubes. If you need to order our products, you can contact us: https://www.yintuosteel.com/product/austenitic/austenitic-stainless-steel-seamless-tube.html
In the petroleum and petrochemical industry, stainless steel pipes are mainly used in pipeline transportation systems, including high-pressure furnace pipes, piping, petroleum cracking pipes, fluid transmission pipes, heat exchange pipes, etc. Stainless steel is required to perform well in wet and acid service conditions.
In order to adapt to the processing of low-quality crude oil and to meet the requirements of environmental protection, Chinese refining and chemical companies continue to optimize the processing structure of the refining unit and adjust the product structure. Among them, high-pressure hydrogenation units such as hydrocracking and hydroprocessing have developed rapidly in recent years. The processing capacity of the unit is It is also constantly improving.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. also keeps pace with the times and produces austenitic stainless steel seamless tube, ferritic stainless steel seamless pipe and tube and other kinds of seamless steel tubes. If you need to order our products, you can contact us: https://www.yintuosteel.com/product/austenitic/austenitic-stainless-steel-seamless-tube.html
The method of using an acid solution to remove oxide scale and rust on the surface of the steel is called pickling. Iron oxides such as scale and rust react chemically with the acid solution to form salts which are dissolved in the acid solution and removed. Acids for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acids.
The dipping and pickling method is generally used, and the spray method can be used in mass production. Steel parts are generally pickled in a 10%-20% sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and the ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At room temperature, the steel is pickled with 20%-80% hydrochloric acid solution to prevent corrosion and hydrogen embrittlement.
Since acid has a great corrosion effect on metals, corrosion inhibitors should be added. After cleaning, the metal surface becomes silvery white, and the surface is passivated to improve the corrosion resistance of stainless steel. In order to eliminate the surface adsorption of the diatomaceous earth carrier and reduce the tailing of the chromatographic peak, the carrier needs to be acid washed or alkaline washed before use. Pickling is to soak the carrier with 6mol/L hydrochloric acid for 2 hours or heat and soak with concentrated hydrochloric acid for 30 minutes, filter, wash with water to neutrality, and dry. Pickling can remove iron, aluminum, calcium, and other impurities on the surface, but cannot remove silanol groups. The pickling carrier is suitable for the analysis of acidic samples.
Degrease and rust the surface of precision seamless steel pipes, and prepare for the next process. In the production process, the pickling process is to remove the surface oxide scale, after which it undergoes lubrication treatment, and then undergoes deep drawing processing. If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and the nuclear energy of the phosphating solution cannot remove them, and the quality of phosphating will be reduced.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is a manufacturer of alloy steel seamless pipe, dedicated to the production of nickel alloy seamless pipe and tube and other seamless pipes. If you need to buy, please contact us: https://www.yintuosteel.com/
The dipping and pickling method is generally used, and the spray method can be used in mass production. Steel parts are generally pickled in a 10%-20% sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and the ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At room temperature, the steel is pickled with 20%-80% hydrochloric acid solution to prevent corrosion and hydrogen embrittlement.
Since acid has a great corrosion effect on metals, corrosion inhibitors should be added. After cleaning, the metal surface becomes silvery white, and the surface is passivated to improve the corrosion resistance of stainless steel. In order to eliminate the surface adsorption of the diatomaceous earth carrier and reduce the tailing of the chromatographic peak, the carrier needs to be acid washed or alkaline washed before use. Pickling is to soak the carrier with 6mol/L hydrochloric acid for 2 hours or heat and soak with concentrated hydrochloric acid for 30 minutes, filter, wash with water to neutrality, and dry. Pickling can remove iron, aluminum, calcium, and other impurities on the surface, but cannot remove silanol groups. The pickling carrier is suitable for the analysis of acidic samples.
Degrease and rust the surface of precision seamless steel pipes, and prepare for the next process. In the production process, the pickling process is to remove the surface oxide scale, after which it undergoes lubrication treatment, and then undergoes deep drawing processing. If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and the nuclear energy of the phosphating solution cannot remove them, and the quality of phosphating will be reduced.
Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is a manufacturer of alloy steel seamless pipe, dedicated to the production of nickel alloy seamless pipe and tube and other seamless pipes. If you need to buy, please contact us: https://www.yintuosteel.com/
The production of seamless steel pipes has a history of nearly 100 years. The German Manismann brothers first invented the two-roll cross-rolling piercing machine in 1885 and invented the periodic tube rolling the machine in 1891. In 1903, the Swiss R Stiefel invented the automatic tube rolling machine. After that, the continuous tube rolling machine and the top machine appeared. Various extension machines such as pipe machines began to form the modern seamless steel pipe industry.
In the 1930s, the use of three-roll pipe rolling mills, extruders, and periodic cold rolling mills improved the variety and quality of steel pipes. In the 1960s, due to the improvement of the continuous tube mill, the emergence of the three-roll piercing machine, especially the success of the application of the tension reducer and the continuous casting billet, improved production efficiency and enhanced the ability of seamless pipes to compete with welded pipes. In the 1970s, seamless pipes and welded pipes went hand in hand, and the world’s steel pipe production increased at an annual rate of more than 5%.
After 1953, China attached great importance to the development of the seamless steel pipe industry and has initially formed a production system for rolling various large, medium and small pipes.
The stainless steel seamless pipe produced by Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. has been favored by a large number of customers because of its high quality and good service. If you need to purchase related seamless steel pipe products, please contact us: https://www.yintuosteel.com/product/austenitic/austenitic-stainless-steel-seamless-tube.html
In the 1930s, the use of three-roll pipe rolling mills, extruders, and periodic cold rolling mills improved the variety and quality of steel pipes. In the 1960s, due to the improvement of the continuous tube mill, the emergence of the three-roll piercing machine, especially the success of the application of the tension reducer and the continuous casting billet, improved production efficiency and enhanced the ability of seamless pipes to compete with welded pipes. In the 1970s, seamless pipes and welded pipes went hand in hand, and the world’s steel pipe production increased at an annual rate of more than 5%.
After 1953, China attached great importance to the development of the seamless steel pipe industry and has initially formed a production system for rolling various large, medium and small pipes.
The stainless steel seamless pipe produced by Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. has been favored by a large number of customers because of its high quality and good service. If you need to purchase related seamless steel pipe products, please contact us: https://www.yintuosteel.com/product/austenitic/austenitic-stainless-steel-seamless-tube.html
Seamless steel pipes are used in many industries in many regions, but for customers, they often do not have a deep understanding of how to purchase such pipes. Therefore, this article also briefly introduces what are the common problems in purchasing this type of steel pipe. First of all, when purchasing this kind of steel pipe, you must choose a large and medium-sized seamless steel pipe manufacturer to purchase. You must know that the steel pipe manufactured by such a steel pipe manufacturer is guaranteed in quality and can ensure that the customer does not use it after purchase. There will be too many problems. Secondly, when purchasing such steel pipes, the company that sells steel pipes should also be required to produce documents that certify the quality of the steel pipe products and the certificate number for the implementation of consumer consent management measures.
Perhaps such basic matters, many consumers will know when they choose seamless steel pipes, but consumers who don’t know about this type of steel pipes, apart from these very basic precautions, do they need to pay attention to them when buying. of? According to industry experts, in addition to the basic selection items, customers should also understand the process performance and labeling of steel pipes, because steel pipes should be rolled on the surface with model designation, company name and steel pipe diameter. The more important point is to pay attention to observation. The surface of the steel pipe is not allowed to have defects such as cracks, scabs, and expansion. If you find such problems as the steel pipe during the selection process, you should still pay attention to it.
All in all, the application of seamless steel pipes has become a very common thing. For many companies, it is very common to buy such steel pipes daily, so it is very necessary to pay more attention when purchasing. Using the stain resistance of seamless steel pipes, you can pour a small amount of ink or water on the surface of the steel pipe and let it rest for about three minutes when purchasing, then wash it or wipe it with a rag, and then check whether the remaining traces are obvious. . If only a small amount of traces are left, it proves that the steel pipe has strong antifouling properties and good physical properties. On the contrary, if there are obvious traces, it has been proved that the quality of the steel pipe is poor and the antifouling properties are not good. In addition, when choosing the steel pipe, you can also consider tapping the pipe body with your hands. If the sound is a silver bell-like sound, it proves that the steel pipe has a high density and good quality.
We are constantly moving forward, but we also see the stars and ambitious ambitions. For more information, please contact us: https://www.yintuosteel.com/ . Christmas time is here. I hope you have a wonderful New Year. May hold happy hours for you.
Into the world of stainless steel
2020年12月21日Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless pipe, nickel-nickel alloy and seamless pipe.
Stainless steel is that all metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide formed on ordinary carbon steel continues to oxidize, causing the corrosion to continue to expand and eventually forming holes. It is possible to use paint or oxidation-resistant metals (for example, zinc, nickel and chromium) for electroplating to protect the surface of carbon steel, but, as people know, this protection is only a thin film. If the protective layer is damaged, the steel below will begin to rust.
Chromium is the basic element for the corrosion resistance of stainless steel. When the chromium content in the steel reaches about 12%, the chromium interacts with the oxygen in the corrosive medium to form a very thin oxide film (self-passivation film) on the surface of the steel. , Can prevent further corrosion of the steel matrix. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and performance of stainless steel.
Stainless steel is usually divided into:
1. Ferritic stainless steel. Containing 12% to 30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is better than other types of stainless steel. .
2. Austenitic stainless steel. Containing more than 18% chromium, it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to corrosion by various media.
3. Austenitic-ferritic duplex stainless steel. It has the advantages of austenitic and ferritic stainless steel, and has superplasticity.
4. Martensitic stainless steel. High strength, but poor plasticity and weldability.
We are constantly moving forward, but we also see the stars and ambitious ambitions. For more information, please contact us: https://www.yintuosteel.com/. Christmas time is here. I hope you have a wonderful New Year. May hold happy hours for you.
Stainless steel is that all metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide formed on ordinary carbon steel continues to oxidize, causing the corrosion to continue to expand and eventually forming holes. It is possible to use paint or oxidation-resistant metals (for example, zinc, nickel and chromium) for electroplating to protect the surface of carbon steel, but, as people know, this protection is only a thin film. If the protective layer is damaged, the steel below will begin to rust.
Chromium is the basic element for the corrosion resistance of stainless steel. When the chromium content in the steel reaches about 12%, the chromium interacts with the oxygen in the corrosive medium to form a very thin oxide film (self-passivation film) on the surface of the steel. , Can prevent further corrosion of the steel matrix. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and performance of stainless steel.
Stainless steel is usually divided into:
1. Ferritic stainless steel. Containing 12% to 30% chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is better than other types of stainless steel. .
2. Austenitic stainless steel. Containing more than 18% chromium, it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to corrosion by various media.
3. Austenitic-ferritic duplex stainless steel. It has the advantages of austenitic and ferritic stainless steel, and has superplasticity.
4. Martensitic stainless steel. High strength, but poor plasticity and weldability.
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Structure and properties of alloy steel
2020年12月14日
There are many types of alloy steels, usually divided into low alloy steel according to the content of alloying elements; they are divided into high quality according to quality Alloy steel, special alloy steel; according to characteristics and uses, it is divided into alloy structural steel, stainless steel, acid-resistant steel, wear-resistant steel, heat-resistant steel, alloy tool steel, rolling bearing steel, alloy spring steel and special performance steel (such as soft magnetic steel) , Permanent magnet steel, non-magnet steel), etc.
Organization and performance
1. The content of nickel and molybdenum has a certain influence on the microstructure transformation of low-carbon high-alloy steel for liner. When the low-carbon high-alloy steel contains 1.0% Ni, 0.7% Mo, the annealed and quenched and tempered microstructures are both lath martensite; when it contains 1.0% Ni, 0.5% Mo and 0.8% Ni, 0.5% Mo When the annealing structure is a mechanical mixture of ferrite and alloy carbide Cr7C3, Mo2C, the quenched and tempered structure is mainly lath martensite.
2. With the decrease of nickel and molybdenum content, the structure of low-carbon high-alloy steel in the annealed state has changed, so that its hardness is reduced, but the impact toughness has been improved; The hardness of the martensite is maintained at about 50HRC; the corrosion resistance is slightly reduced, but it is still in one level, that is, the seventh level is still corrosion resistant. When the other components remain unchanged and the molybdenum content is reduced to 0.5%, the impact toughness of the sample is improved.
3. Low-carbon high-alloy steel containing 0.8% Ni and 0.5% Mo meets the requirements for the use of liners, which is more economical in terms of cost.
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Compared with carbon steel, alloy steel contains more other elements.
Alloy steel refers to steel containing silicon and manganese as alloying elements or deoxidizing elements, as well as other alloying elements, and some also containing certain non-metallic elements. According to the content of alloying elements in steel, it can be divided into low alloy steel, medium alloy steel and high alloy steel.
Carbon steel mainly refers to the steel whose mechanical properties depend on the carbon content in the steel, and generally do not add a large amount of alloying elements, sometimes also called normal carbon steel or carbon steel.
Carbon steel is also called carbon steel, an iron-carbon alloy with a carbon content of less than 2% WC. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur, and phosphorus. According to its purpose, carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free-cutting structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC0.25%-0.6%) and high carbon steel (WC>0.6%) [11]
Generally, the higher the carbon content of carbon steel, the higher the hardness and the higher the strength, but the lower the plasticity.
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The invention and use of stainless steel can be traced back to the First World War. British scientist Henry Brearley was commissioned by the British government’s military arsenal to study the improvement of weapons. At that time, the barrel of the rifle used by soldiers was very easy to wear, and Brearley wanted to invent an alloy steel that was not easy to wear.
The stainless steel invented by Blairley obtained a British patent in 1916 and began mass production. Since then, the stainless steel accidentally found in garbage dumps has become popular all over the world, and Henry Blairley is also known as the "father of stainless steel." During the First World War, British guns on the battlefield were always transported back to the rear because the barrel was worn out. The military production department ordered Blairley to develop high-strength wear-resistant alloy steel, specifically researching and solving the problem of gun bore wear. Blairley and his assistants collected various types of steels and alloy steels of different properties produced at home and abroad, performed performance experiments on machines of various properties, and then selected more suitable steels to make guns. One day, they experimented with a domestic alloy steel containing a lot of chromium. After a wear test, it was found that this alloy was not wear-resistant, indicating that it could not make guns. So they recorded the results of the experiment and threw them into the corner. thing. One day a few months later, an assistant rushed to Blairley with a piece of shiny steel and said: "Sir, this is the alloy steel from Mr. Mullah that I found when I was cleaning the warehouse. You Do you experiment to see what special effect it has!" "Okay!" Breerley said happily, looking at the dazzling steel.
The experimental results prove that it is a piece of stainless steel that is not afraid of acid, alkali, and salt. This stainless steel was invented by a German mullah in 1912, however, the mullah did not know what purpose this stainless steel had.
Blairley thought to himself: "This kind of non-wearing but corrosion-resistant steel can’t be used to make guns. Can it be used as tableware?" He just said it and made stainless steel fruit knives, forks, spoons, and fruit plates And folding knives, etc.
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In addition to corrosion resistance of oxidizing acid media, austenitic stainless steel seamless pipes can be resistant to corrosion by sulfuric acid, phosphoric acid, formic acid, acetic acid, urea, etc. if they contain Mo, Cu and other elements. If the carbon content of this type of steel is less than 0.03% or contains Ti and Ni, its resistance to intergranular corrosion can be significantly improved. High silicon austenitic stainless steel has good corrosion resistance to concentrated nitric acid. As austenitic stainless steel has comprehensive and good comprehensive properties, it has been widely used in various industries.
Austenitic stainless steel has a stable austenite structure at room temperature, high corrosion resistance, good cold workability and gcxxJ toughness, plasticity, weldability and non-magnetic properties. It has been widely used in heat exchanger condensers, evaporators and fluid transportation in chemical, oil refining, boilers, foxxJ and other industries.
Austenitic stainless steel can also produce castings. In order to improve the fluidity of molten steel and improve casting performance, the alloy composition of cast steel should be adjusted: increase the silicon content, widen the range of chromium and nickel content, and increase the upper limit of the impurity element sulfur.
Austenitic stainless steel should be solid-solution treated before use in order to maximize the solid solution of various precipitates such as carbides in the steel into the austenite matrix, while also homogenizing the structure and eliminating stress, so as to ensure excellent Corrosion resistance and mechanical properties. The correct solution treatment system is water cooling after heating at 1050～1150℃ (air cooling is also available for thin parts). The solution treatment temperature depends on the degree of alloying of the steel: molybdenum-free or low-molybdenum steel grades should be lower (≤1100℃), and higher alloyed grades such as 00Cr20Ni18Mo-6CuN, 00Cr25Ni22Mo2N, etc. should be higher (1080～1150) ℃).
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Stainless steel seamless pipe is a long strip of steel with a hollow section and no joints on the periphery. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, its processing cost will rise substantially. Seamless steel pipes are tubular sections or hollow cylinders, usually but not necessarily circular cross-sections, and are mainly used to transport flowable substances-liquids and gases (fluids), slurries, powders and small solids.
There are various methods of manufacturing and producing pipes. Welded type, seamless type and other types have different uses and have different mechanical properties. The absolute roughness of stainless steel seamless pipe is smaller; it means higher dimensional accuracy. This is useful in sensitive applications and does not require much processing after production. Seamless pipes are usually cold drawn, while stainless steel welded pipes are produced by welding. Stainless steel Erw tubes are resistance welded and are made by welding long metal bars into a cylindrical shape.
Seamless stainless steel pipes have been widely used in petrochemical, boiler, nuclear power, machinery, shipping, water conservancy and other industries.
Ferritic stainless steels are classified into the 400 series, with a chromium content of usually 10% to 30%, and are usually selected for their excellent corrosion resistance and high temperature oxidation resistance. Ferrite has higher strength than carbon steel and has advantages in many applications that require thinner materials and reduced weight (such as automotive emission control systems). They cannot be hardened by heat treatment and are always magnetic. Typical applications of ferritic stainless steel include petrochemicals, automotive exhaust systems and decorations, heat exchangers, furnaces, household appliances and food equipment.
If you are interested in buying ferritic stainless steel seamless pipes, please contact the appropriate supplier of the seamless pipe manufacturer: Huzhou Nanxun Yintuo Special Material Technology Co., Ltd.
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