Seamless Steel pipes can be divided into general-purpose seamless steel pipes and special-purpose seamless steel pipes. General purpose seamless steel pipes are often divided into three categories according to their uses:
1. Seamless steel pipes classified according to chemical composition and mechanical properties. This kind of seamless steel pipes need to meet the chemical composition requirements, but also to ensure the mechanical properties of the seamless steel pipes, all must meet the requirements of relevant regulations.
2. Seamless steel pipes classified by mechanical properties. This kind of seamless steel pipe is a steel pipe rolled with ordinary carbon steel, which needs to meet the mechanical performance requirements of Class A steel, and it is also necessary to ensure that the content of sulfur and phosphorus in the steel is below the prescribed limit.
3. Seamless steel pipes classified by hydraulic test. This type of steel pipe is generally used as a variety of steel pipes to withstand fluid pressure. The chemical composition and mechanical properties of this type of seamless steel pipe are not specified, but they need to pass the water pressure test specified by YB231-70 and must be qualified.
According to the special purpose, seamless steel pipes are divided into seamless steel pipes for boilers, high-pressure seamless steel pipes for boilers, seamless steel pipes for geological drilling, seamless steel pipes for petroleum cracking, and stainless and acid-resistant seamless steel pipes. In addition to ensuring the chemical composition and mechanical properties of steel pipes, they also need to ensure some special performance indicators, such as heat treatment and metal internal organization.
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