Steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. according to the pipe material (ie steel type). Carbon tubes can be divided into ordinary carbon steel tubes and high-quality carbon structural tubes. Alloy pipes can be divided into: low alloy pipes, alloy structural pipes, high alloy pipes, and high strength pipes. Bearing tubes, heat-resistant and acid-resistant stainless tubes, precision alloy (such as Kovar alloy) tubes and high-temperature alloy tubes, etc.