Views: 1 Author: Site Editor Publish Time: 2022-04-28 Origin: Site
Fake and inferior steel pipes are prone to folding. Folds are various fold lines formed on the surface of the steel pipe, and this defect often runs through the longitudinal direction of the entire product. The reason for the folding is that the counterfeit and inferior manufacturers pursue high efficiency and the reduction amount is too large, which leads to problems with the tube body. Folding occurs during the next rolling, and the folded product will crack after bending, and the strength of the steel tube will be greatly reduced.
Fake and inferior steel pipes often have pockmarked surfaces. A pockmarked surface is a defect of irregular unevenness on the surface of the steel pipe due to serious wear of the rolling groove. Due to the pursuit of profit by the manufacturers of fake and shoddy steel pipes, the rolling of the grooves often exceeds the standard.
The surface of fake and inferior steel pipes is prone to scarring. There are two reasons: 1. The material of fake and inferior steel pipes is uneven and there are many impurities. 2. Fake and inferior material manufacturers have simple guide equipment, which is easy to stick to steel, and these impurities are prone to scarring after rolling.
The surface of the fake and inferior material is prone to cracks. The reason is that its blank is adobe, and the adobe has many pores. During the cooling process, the adobe is subjected to thermal stress, resulting in cracks. After rolling, there are cracks.
Fake and inferior steel pipes have no metallic luster and are light red or similar to pig iron for two reasons. Its blank is adobe. 2. The rolling temperature of fake and inferior materials is not standard, and their steel temperature is measured visually so that the rolling can not be carried out according to the specified austenite area, and the performance of the steel pipe will naturally fail to meet the standard.
The horizontal bars of the fake and inferior steel pipes are thin and low, and there is often a phenomenon of unsatisfactory filling. The reason is that to achieve a large negative tolerance, the reduction amount of the first few passes of the finished product is too large, the iron shape is too small, and the hole shape is unsatisfactory.