Manufacturing technology of black steel pipes
1. Forging
Forging is the process of heating steel to the thermoplastic temperature and then deforming it into the desired shape by hammering or pressure. Forging can improve the mechanical properties of steel and improve the uniformity and density of steel. However, the forging process is relatively complicated and the production efficiency is low.
2. Hot rolling
Hot rolling is to heat the steel billet to a certain temperature and then transform it into a steel coil of the required thickness and width by roller rolling. Hot rolling can improve the mechanical properties and surface quality of steel at the same time. However, the hot rolling process requires a high temperature environment, consumes a lot of energy and pollutes the environment. In addition, since the surface of the hot-rolled steel coil is relatively rough, subsequent processing is required.
3. Cold drawing
Cold drawing is to pass the hot-rolled steel coil through a cold drawing machine to transform it into a steel pipe of the required thickness and width at room temperature. Cold drawing can improve the surface quality and dimensional accuracy of steel, as well as the mechanical properties of steel. The cold drawing process is relatively simple and has high production efficiency.
4. Cold rolling
Cold rolling is to heat the steel billet to the appropriate temperature, and then transform it into a steel coil of the required thickness and width through roller rolling. Cold rolling can improve the surface quality and dimensional accuracy of the steel coil, and can also improve the mechanical properties of the steel. The cold rolling process consumes less energy and has less environmental pollution.
5. Welding
Welding is the process of connecting two or more steel plates into a whole. Welding can achieve seamless connection of steel and improve the strength and stability of steel. The welding process requires a high temperature environment, consumes a lot of energy and pollutes the environment. For some special shapes of steel pipes, special welding processes are required.
In short, the manufacturing process of black steel pipes includes multiple steps such as forging, hot rolling, cold drawing, cold rolling, and welding. Each process has its characteristics and scope of application. When selecting steel pipes, the appropriate process should be selected according to the specific situation.
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