Surface defects of seamless steel pipes and their causes

The causes of surface defects of seamless steel pipes are intricate and complicated. There are hundreds of influencing factors listed. Sometimes there are dozens of factors for the same defect, and the generation of defects has a great relationship with the steel type. This is why the production of seamless steel pipes is complicated.

Generally speaking, it is caused by the following aspects:

1. In terms of raw materials:
The poor internal organization will cause internal folding, cracks in the tube wall, delamination, etc.; poor surface quality of raw materials will cause external folding;

2. Process operation:
Improper heating will cause internal folding, external folding, cracks in the pipe wall, delamination, uneven wall thickness, etc. Improper processing of mold processing, materials, adjustment, use, etc. will cause internal and external folding, uneven wall thickness, internal and external threads, and pits Wait

3. Equipment
In terms of equipment, it is mainly caused by internal folding, external folding, uneven wall thickness, internal and external threads, and scratches caused by poor equipment performance, looseness, and scratches.

In daily life, we can analyze the factors by checking the specific defects and production process of steel pipes and then judge the specific reasons in combination with the production site.