The Methods to Distinguish Fake and Shoddy Posted Sides Seamless Steel Pipe
Fake and shoddy posted sides seamless steel pipe always has puckering. The puckering means the fold lines on the surface of the seamless steel pipe, and this disfigurement run through the portrait of the product. It is caused by the large rolling reduction which produces wulst formed ring. In the next rolling process, the puckering appears. The seamless steel pipe with puckering may craze while being bended, and has reduction in its intensity.

The surface of fake and shoddy posted sides seamless steel pipe is always rough. The striated surface  of the seamless steel pipe is mainly because of the badly worn riefe. The manufacturers are profit seeking, so the rolling riefe is always exceed standard.

The surface of fake and shoddy posted sides seamless steel pipe always has scar. There are two reasons. First, the material of the seamless steel pipe is asymmetry and has lots of impurity in it. Second, the guide and protect equipment is quite simple and crude, the steel may easily stick to it, and has scar after rolling.
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