Classification of stainless steel pipes: stainless steel seamless steel pipes and stainless steel welded steel pipes (slotted steel pipes) are basically two categories. According to the outer diameter of the steel pipe, it can be divided into round pipes and special-shaped pipes. Round steel pipes are widely used, but there are some special-shaped steel pipes such as square, rectangular, semi-circular, hexagonal, equilateral triangle, and octagonal.
For steel pipes subjected to fluid pressure, hydraulic tests and radiographic inspections must be performed to check their pressure resistance and quality. It is qualified that no leakage, soaking or expansion occurs under the specified pressure. Some steel pipes must also be tested according to standards or the requirements of the buyer. Hemming test, flare test, flattening test, etc.
Seamless stainless steel pipe is also called stainless steel seamless pipe. It is made of steel ingots or solid pipe blanks through perforation to make capillary, and then made by hot rolling, cold rolling or cold drawing. The specifications of seamless steel pipes are expressed in millimeters of outer diameter * wall thickness.
