Steel pipe can be manufactured by two processes: cold rolling and hot rolling.
- Cold Rolling Process
Cold rolling refers to the process of pressing metal materials at unconventional hot rolling temperatures to achieve the required specifications. Cold rolling is carried out at room temperature and is suitable for steel pipe manufacturing that requires high surface accuracy, dimensional accuracy and material strength.
- Cold rolling process
Cold rolling process includes important steps such as annealing, pickling, cold rolling, pickling and quenching. Among them, the annealing of steel is to eliminate the internal stress of steel, easy to realize the purpose of cold working. Pickling, on the other hand, is to remove the steel surface oxides and improve the surface quality. After these pre-treatments, the steel is pressed into steel tubes of specified sizes in the cold rolling mill.
- Advantages and disadvantages of the cold rolling process
Advantages of the cold rolling process is to produce a smooth surface, high dimensional accuracy, high strength, suitable for the manufacture of machinery manufacturing, automotive parts and other high-precision industrial products. The disadvantage of cold rolling process is that the production efficiency is low, high cost.
Second, hot rolling process
Hot rolling refers to the process of rolling metal materials at high temperatures to create the required specifications. Hot rolling is suitable for the manufacture of relatively thick steel pipe, for the need for high strength, high toughness steel also has certain advantages.
- Hot rolling process
Hot rolling process includes pickling, hot rolling, pickling, water cooling, deacidification, roll cleaning, roll collection and other steps. Among them, the pretreatment steps such as pickling and deacidification can remove the oxides on the steel surface and improve the surface quality.
- Advantages and disadvantages of hot rolling process
The advantages of the hot rolling process lie in the high production efficiency and relatively low cost, which is suitable for the production of large-scale and large production volume of steel pipe products. In addition, the hot rolling process can make the steel pipe has a better plastic deformation capacity and toughness, improve the service life of the steel pipe. The disadvantage of the hot rolling process is that the surface accuracy is limited and the dimensional accuracy is low.
[Conclusion
In the manufacturing process of steel pipe, the commonly used rolling processes are cold rolling and hot rolling, and both processes have their own advantages and disadvantages. For the manufacture of steel pipes of different properties and different uses, different rolling processes are selected to better meet the needs of steel pipe use.