Steel pipes are used for conveying fluids and powdery solids, exchanging heat energy, manufacturing mechanical parts and containers, and are also an economic steel material. There are seamless steel pipes and seam steel pipes, which are also divided into straight seam steel pipes and spiral seam welded pipes. While the rapid development of the market has brought us convenience, if you lack a pair of insight when purchasing Yantai steel pipes, you are likely to purchase inferior products. Today, we will introduce the methods for identifying steel pipes.
1. Fake and inferior steel pipes are prone to folding, which is a variety of creases formed on the surface of the steel pipe, and this defect often runs through the longitudinal direction of the entire product. The reason for folding is due to the pursuit of production by fake and inferior manufacturers, which leads to the generation of ears. Folding occurs during the next rolling process, and the folded product will crack after bending, resulting in a decrease in the strength of the steel.
2. The surface of fake and inferior steel pipes is prone to scabbing, but it should be noted that the material is uneven and there are many impurities; The equipment is simple and easy to stick steel, and these impurities can easily cause scarring after biting the rolling roller.
3. Poor materials are prone to cracks on the surface because their billets are made of adobe, which has many pores. During the cooling process, the adobe undergoes cracks due to thermal stress, which can occur after rolling.
4. The appearance of fake and inferior steel pipes often has pitted surfaces. Pitted surface is a defect caused by severe wear and tear on the rolling groove, which leads to irregular unevenness on the steel surface and is also prone to scratches.