Rust of Inferior Thick-walled Seamless Steel Pipe

1, the low quality thick wall seamless steel pipe is easy to fold. Folding is the surface of thick walled seamless steel tubes, which is formed by various fold lines. This defect often runs through the vertical direction of the product. The cause of folding is due to the high efficiency of the poor quality manufacturers, the pressure is too large, leading to the ear rolling in the next fold, after the folding of the product will break, thick wall seamless steel pipe strength decline.


2. the surface of seamless steel tube is thick with surface appearance. Pockmark is due to the serious wear of trenches, resulting in irregular irregular surface defects of thick walled seamless steel tubes. Due to the pursuit of profit loss for thick walled seamless steel tube manufacturers, rolling trench rolling is often the most extreme.


The surface of 3. thick wall seamless steel tube is easy to produce scar. There are two reasons: 1. The fake thick wall seamless steel tube has uneven material and many impurities. 2., inferior material manufacturers are bad at guiding equipment and easy to stick steel. These impurities bitten the roller and produce scar easily.