How does the hot-rolled steel pipe process affect the quality of steel pipes

The impact of hot-rolled steel pipe technology on steel pipe quality is mainly reflected in the following aspects:
1. Rolling temperature: Rolling temperature is one of the most important parameters in the hot rolling process. If the temperature is too high, the steel may overheat, oxidize, or even melt, resulting in a rough surface of the steel pipe and defects such as bubbles; if the temperature is too low, the steel may not be able to fully plastically deform, resulting in cracks and other defects. Therefore, choosing the appropriate rolling temperature is an important prerequisite for ensuring the quality of steel pipes.

2. Rolling speed: The rolling speed determines the deformation of the steel pipe during the rolling process. Too high a rolling speed may lead to inconsistent temperatures between the inner and outer walls of the steel pipe, resulting in thickness deviations or uneven texture; too low a rolling speed may cause insufficient plastic deformation of the steel pipe, resulting in surface roughness, cracks, and other defects. Therefore, reasonable selection of rolling speed is also an important factor affecting the quality of steel pipes.

3. Degree of deformation: During the hot rolling process, the steel pipe is subjected to the compression and extension of the rollers, causing plastic deformation. The degree of deformation directly affects the structure and performance of the steel pipe. The appropriate degree of deformation can make the steel pipe structure more fine and uniform, and improve its mechanical properties; while excessive deformation may cause defects such as cracks and folds in the steel pipe, affecting its quality and service life.

4. Cooling rate: Hot-rolled steel pipes need to be cooled to obtain the required structure and properties. Different cooling rates will have an impact on the organizational structure and mechanical properties of the steel pipe. Choosing an appropriate cooling rate can effectively control the phase transformation and structural transformation of the steel pipe, thereby improving its quality and performance.

In short, factors such as rolling temperature, rolling speed, degree of deformation, and cooling rate in the hot-rolled steel pipe process will all affect the quality of the steel pipe. Through reasonable selection and control of process parameters, the quality and performance of hot-rolled steel pipes can be effectively improved.