API 5L Seamless Steel Pipe surface defects and causes

　　The causes of surface defects in API 5L seamless steel pipes are complicated. If listed, there are hundreds of influencing factors. Sometimes there are dozens of factors causing the same defect, and the occurrence of defects is closely related to 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: poor internal structure will cause internal folding, cracks in the pipe wall, delamination, etc.; poor surface quality of the raw materials will cause external folding;

　　2. In terms of process operation: Improper heating will cause inner and outer folding, cracks in the pipe wall, separation layer, uneven wall thickness, etc. Improper tool and mold processing, materials, adjustment, use, etc. will cause inner and outer folding and uneven wall thickness. , internal and external threads, pits, etc.

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

　　In daily life, you can analyze the factors that occur by checking the specific defects of steel pipes and the production process, and then judge the specific causes based on the production site.

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