Surface defects of seamless steel pipes and their causes

The causes of surface defects of seamless steel pipes are intricate. There are hundreds of influencing factors listed, and sometimes there are dozens of factors for the same defect, and the occurrence 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 several aspects:

1. Raw materials:

Poor internal structure will cause internal folding, cracks in the pipe wall, delamination, etc.; poor surface quality of raw materials will cause external folding;

2. Process operation:

Improper heating will cause inner folding, outer folding, cracks in the pipe wall, separation layer, uneven wall thickness, etc. Improper tooling and mold processing, materials, adjustment, use, etc. will cause inner and outer folding, uneven wall thickness, internal and external threads, and pits Wait

3. Equipment

In terms of equipment, it is mainly due to internal folding, external folding, uneven wall thickness, internal and external threads, and scratches caused by poor equipment performance, looseness, and scratches. In daily life, you can analyze the causes by checking the specific defects and production process of steel pipes, and then judge the specific reasons based on the production site.