1. False and inferior seamless steel pipes are easy to scratch, because the fake and inferior seamless steel pipe manufacturer's equipment is simple, easy to produce burrs, scratch the steel surface. Deep scratch reduces the strength of steel.
2. The fake and inferior seamless steel pipe has no metallic luster and is light red or similar to pig iron.
3. The transverse bars of fake and inferior seamless steel tubes are thin and low, and the phenomenon of filling is often unsatisfactory. The reason is that in order to achieve a large negative tolerance, the manufacturer has a large reduction in the first several passes of the finished products, a small iron shape and a unsatisfactory filling of the passes.
4. The cross-section of the fake and inferior seamless steel tube is elliptical, because in order to save material, the reduction of the first two rolls of the finished product is too large. The strength of this kind of seamless steel tube decreases greatly, and it does not conform to the standard of the shape and size of the seamless steel tube.