topper
The Heat Treatment Process of Cold Drawn Steel Pipes
Oct 17, 2021
da***********01
On this page
The cold drawn steel pipe is one of the most widely used steel pipes in daily life. It is a complete steel pipe produced by drawing, extrusion, perforation and other methods. There is no joint on the surface of the pipe, and it is a hollow section of the pipe with round, square and other shapes. It is made of steel ingot or solid billet by perforation into capillary, and then made by cold dial.
In addition to the general steel pipe, the low and medium pressure boiler steel pipe, the high pressure boiler steel pipe, the alloy steel pipe, the stainless steel pipe and the petroleum cracking pipe, the cold drawn steel pipe also includes the carbon thin-wall steel pipe, the alloy thin-wall steel pipe, the stainless steel pipe and the special-shaped steel pipe. The outer diameter of the hot-rolled seamless steel pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm. The inner diameter of the fine-drawn seamless steel pipe can be up to 6mm, and the wall thickness can be up to 0.25mm. The outer diameter of the thin-walled pipe can be up to 5mm, and the wall thickness is less than 0.25mm.
The general heat treatment equipment process of cold drawn steel pipes is as follows:
1. The quenching and tempering of cold-drawn steel pipes refers to the composite heat treatment process of quenching and tempering steel or steel parts. The steel used in quenching and tempering treatment is called quenching and tempering steel. It generally refers to medium carbon structural steel and medium carbon alloy structural steel.
2. The annealing of cold drawn steel pipes: the common annealing process: recrystallization annealing, stress relief annealing, spheroid zing annealing, complete annealing, etc. The purpose of annealing is mainly to reduce the hardness of metal materials, improve plasticity for cutting or pressure processing and reduce residual stress. It will improve the homogenization of the structure and composition, or you should prepare for the post-heat treatment.
3. The quenching of cold drawn steel pipes: the common quenching process: salt bath quenching, martensite quenching, bainite isothermal quenching, surface quenching and local quenching. The purpose of quenching is to obtain the required martensite structure of the steel, improve the hardness, strength and wear resistance of the work piece, and you should prepare the microstructure for the post-heat treatment.
4. The normalizing of cold drawn steel pipes: The purpose of normalizing is mainly to improve the mechanical properties of low carbon steel, improve the machinability, refine grains and eliminate organizational defects to prepare for the post-heat treatment.
5. The tempering of cold drawn steel pipes: common tempering process: low temperature tempering, medium temperature tempering, high temperature tempering and many-time tempering. The purpose of tempering is mainly to eliminate the stress produced by the steel during quenching so that the steel has high hardness and wear resistance, and it has the required plasticity and toughness.
In addition to the general steel pipe, the low and medium pressure boiler steel pipe, the high pressure boiler steel pipe, the alloy steel pipe, the stainless steel pipe and the petroleum cracking pipe, the cold drawn steel pipe also includes the carbon thin-wall steel pipe, the alloy thin-wall steel pipe, the stainless steel pipe and the special-shaped steel pipe. The outer diameter of the hot-rolled seamless steel pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm. The inner diameter of the fine-drawn seamless steel pipe can be up to 6mm, and the wall thickness can be up to 0.25mm. The outer diameter of the thin-walled pipe can be up to 5mm, and the wall thickness is less than 0.25mm.
The general heat treatment equipment process of cold drawn steel pipes is as follows:
1. The quenching and tempering of cold-drawn steel pipes refers to the composite heat treatment process of quenching and tempering steel or steel parts. The steel used in quenching and tempering treatment is called quenching and tempering steel. It generally refers to medium carbon structural steel and medium carbon alloy structural steel.
2. The annealing of cold drawn steel pipes: the common annealing process: recrystallization annealing, stress relief annealing, spheroid zing annealing, complete annealing, etc. The purpose of annealing is mainly to reduce the hardness of metal materials, improve plasticity for cutting or pressure processing and reduce residual stress. It will improve the homogenization of the structure and composition, or you should prepare for the post-heat treatment.
3. The quenching of cold drawn steel pipes: the common quenching process: salt bath quenching, martensite quenching, bainite isothermal quenching, surface quenching and local quenching. The purpose of quenching is to obtain the required martensite structure of the steel, improve the hardness, strength and wear resistance of the work piece, and you should prepare the microstructure for the post-heat treatment.
4. The normalizing of cold drawn steel pipes: The purpose of normalizing is mainly to improve the mechanical properties of low carbon steel, improve the machinability, refine grains and eliminate organizational defects to prepare for the post-heat treatment.
5. The tempering of cold drawn steel pipes: common tempering process: low temperature tempering, medium temperature tempering, high temperature tempering and many-time tempering. The purpose of tempering is mainly to eliminate the stress produced by the steel during quenching so that the steel has high hardness and wear resistance, and it has the required plasticity and toughness.
