The cross section of the fake and shoddy posted sides seamless steel pipe is oval. The reason is that the producer have to save the raw material. These screw-threaded steel always have reduction in strength and fall short of the standard of size and shape.

High quality posted sides seamless steel pipe is uniform composition. The tonnage of the cold shears is very large, and the crop end edge is smooth. The crop end edge of fake and shoddy posted sides seamless steel pipe is always uneven because of the low quality material and also with no metallic luster.

The inside diameter of the fake and shoddy posted sides seamless steel pipe varies a lot. There are three reasons. First, the temperature of the steel is unstable. Second, the composition of the steel is asymmetric. Third, the rolling mill bounces because of the simple and crude equipment and the low intension of the groundsill. This may cause the inside diameter of the same circle varies a lot. These kinds of steel pipe may easily rupture due to the asymmetric pressure.