Thick-walled spiral steel pipes are stronger and more durable than ordinary spiral steel pipes. So what impact does the hardness of thick-walled spiral steel pipes have on their quality?
When the billet is opened with a small deformation, the wall thickness deviation is small, and the surface roughness of the thick-walled spiral steel pipe gradually decreases; when the billet is opened with a large deformation, the wall thickness deviation is large, which will affect the wall thickness of the spiral steel pipe obtained by subsequent passes of rolling. deviation.
The researchers found that: when the total deformation is the same, the more rolling passes, the greater the elongation, hardness, and strength of the thick-walled spiral steel pipe. Good overall performance.
When rolling spiral steel pipes, the material flow is in the form of strips, and when rolling with small deformation, the material flow is in the form of bundles. When the heat treatment conditions between passes and the subsequent rolling process are the same, the structure of the pipe obtained by blanking with large deformation is The distortion is more severe.
Small deformation blanking has little effect on the anisotropy of thick-walled spiral steel pipes; there are certain fluctuations in the anisotropy of mechanical properties during multi-pass rolling.
