Seamless carbon steel pipes(cs seamless pipe)
Seamless carbon steel pipes are made of steel ingots or solid billets through perforation to make capillaries, and then hot-rolled, cold-rolled or cold-drawn.
Hot-rolled carbon seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (pulled) carbon steel seamless pipesIt also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipes can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipes can reach 5mm and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.
Classification of seamless pipes according to carbon content
1) General carbon content precision seamless pipe
Generally, steel with carbon content ≤ 0.25% is called high carbon steel. The quenching mechanism of high carbon steel is metallographic structure and a small amount of ferrite. Its compressive strength and strength are low, and its plastic deformation and ductility are good.It is convenient for drawing, stamping die, extrusion forming, forging and electric welding, among which 20Cr steel is mainly used. The steel has a certain compressive strength. After heat treatment and ultra-low temperature quenching, this type of steel has excellent comprehensive physical properties, excellent ultra-low temperature fracture toughness, and insignificant quenching ductility.
Main use: suitable for making electric welding parts and their parts that are not subjected to high ground stress by forging, hot stamping dies and machining in the machining industry.Water pipes, flanges, headers and various standard parts used in non-corrosive substances in the steam turbine generator and heating furnace processing industry;It is also suitable for the production of small, medium and small nitriding and carbonitriding parts in small cars, large tractors and general machining industries, such as brake shoes on cars, lever shafts, inner and outer shaft sleeves of balancers, etc.; In the small and medium machining industry, such as forged or restrained support rods, shackles, levers, sleeve specifications, tooling fixtures, etc.
2) High carbon steel precision seamless tube
Nitriding of high carbon steel: After the high carbon steel with carbon water content of about 0.15% is solved by carburizing and quenching and ultra-low temperature quenching,It is used to specify parts such as shafts, bushings, sprocket chains and some injection molds with high surface strength and good wear resistance.After carburizing and quenching and ultra-low temperature quenching, the high carbon steel has won the structure that the surface layer is high carbon steel austenite and the core is low carbon environmental austenite.This ensures that the surface layer has high toughness and high wear resistance and the core has very good compressive strength and ductility.Suitable for the production of brake shoes, lever shafts, transmission speed forks, transmission gears, and engine camshafts on large tractors, suspension balancer shafts, balancer inner and outer bushings, sleeve specifications, tooling fixtures and other parts.
3) Low carbon steel precision seamless tube
Low carbon steel: carbon structural steel with carbon content of 0.25% to 0.60%, 30, 35, 40, 45, 50, 55 and other models belong to low carbon steel,Due to the increase of ferrite water content in the steel, its compressive strength and strength are improved compared with the previous ones, and the strength after heat treatment can be significantly improved.Among them, 45 steel is more typical. 45 steel is a high-toughness medium-carbon quenched and tempered steel, with certain plastic deformation and ductility, and excellent machinability. It is used to manufacture parts with high compressive strength and medium ductility. Generally used in heat treatment or quenching conditions. In order to make the steel have the necessary ductility and remove its internal stress, the steel should be quenched into sorbite after heat treatment.
Seamless carbon steel pipes are made of steel ingots or solid billets through perforation to make capillaries, and then hot-rolled, cold-rolled or cold-drawn.
Hot-rolled carbon seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (pulled) carbon steel seamless pipesIt also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipes can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipes can reach 5mm and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.
Classification of seamless pipes according to carbon content
1) General carbon content precision seamless pipe
Generally, steel with carbon content ≤ 0.25% is called high carbon steel. The quenching mechanism of high carbon steel is metallographic structure and a small amount of ferrite. Its compressive strength and strength are low, and its plastic deformation and ductility are good.It is convenient for drawing, stamping die, extrusion forming, forging and electric welding, among which 20Cr steel is mainly used. The steel has a certain compressive strength. After heat treatment and ultra-low temperature quenching, this type of steel has excellent comprehensive physical properties, excellent ultra-low temperature fracture toughness, and insignificant quenching ductility.
Main use: suitable for making electric welding parts and their parts that are not subjected to high ground stress by forging, hot stamping dies and machining in the machining industry.Water pipes, flanges, headers and various standard parts used in non-corrosive substances in the steam turbine generator and heating furnace processing industry;It is also suitable for the production of small, medium and small nitriding and carbonitriding parts in small cars, large tractors and general machining industries, such as brake shoes on cars, lever shafts, inner and outer shaft sleeves of balancers, etc.; In the small and medium machining industry, such as forged or restrained support rods, shackles, levers, sleeve specifications, tooling fixtures, etc.
2) High carbon steel precision seamless tube
Nitriding of high carbon steel: After the high carbon steel with carbon water content of about 0.15% is solved by carburizing and quenching and ultra-low temperature quenching,It is used to specify parts such as shafts, bushings, sprocket chains and some injection molds with high surface strength and good wear resistance.After carburizing and quenching and ultra-low temperature quenching, the high carbon steel has won the structure that the surface layer is high carbon steel austenite and the core is low carbon environmental austenite.This ensures that the surface layer has high toughness and high wear resistance and the core has very good compressive strength and ductility.Suitable for the production of brake shoes, lever shafts, transmission speed forks, transmission gears, and engine camshafts on large tractors, suspension balancer shafts, balancer inner and outer bushings, sleeve specifications, tooling fixtures and other parts.
3) Low carbon steel precision seamless tube
Low carbon steel: carbon structural steel with carbon content of 0.25% to 0.60%, 30, 35, 40, 45, 50, 55 and other models belong to low carbon steel,Due to the increase of ferrite water content in the steel, its compressive strength and strength are improved compared with the previous ones, and the strength after heat treatment can be significantly improved.Among them, 45 steel is more typical. 45 steel is a high-toughness medium-carbon quenched and tempered steel, with certain plastic deformation and ductility, and excellent machinability. It is used to manufacture parts with high compressive strength and medium ductility. Generally used in heat treatment or quenching conditions. In order to make the steel have the necessary ductility and remove its internal stress, the steel should be quenched into sorbite after heat treatment.
