How to distinguish the authenticity of thick-walled seamless pipes

First, the surface of fake and shoddy materials is prone to cracks, because the billet is adobe, which has many pores, and the adobe is cracked by the thermal stress during cooling, and cracks appear after rolling.


Second, poor quality thick-walled seamless pipes are prone to breakage. Folds are various folding lines formed on the surface of thick-walled seamless tubes, and these folding lines often span the longitudinal direction of the product. The reason why the folding type is because the inferior manufacturers pursue high efficiency, the crushing amount is too large, and ears are generated. During the next rolling, folding occurs, and the folded product bends and cracks, and the strength of the thick-walled seamless pipe is greatly reduced. .


Third, the surface of inferior thick-walled seamless steel pipes is prone to scarring. There are two reasons for this: ① Inferior thick-walled seamless pipes have uneven materials and many impurities. ② The guide equipment of the fake and shoddy material manufacturers is simple and easy to stick to steel. These impurities are easy to produce scars when they bite into the roll.


Fourth, pitting often occurs on the surface of inferior thick-walled seamless steel pipes. The matte surface is caused by the severe wear of the grooves and the irregular wear of the surface of the thick-walled seamless steel pipe. In order to pursue profits, inferior thick-wall thick-wall seamless steel pipe manufacturers often have the most rolling grooves.


5. The high-quality thick-walled seamless pipe has a uniform composition, a high tonnage of the cold shearing machine, and a smooth and neat cutting head end face. Fake and shoddy materials are often of poor quality.