Seamless pipe performance

3.1. Domestic seamless pipes supplied according to institutional performance, ordinary carbon steel shall be manufactured according to Class A steel in GB/T700-88 (but the sulfur content must not exceed 0.050% and the phosphorus content must not exceed 0.045%), and their mechanical properties shall comply with the values specified in the GB8162-87 table.
3.2. Domestic seamless pipes supplied according to the hydraulic test must ensure the hydraulic test specified in the standard.
3.3. The physical performance inspection of imported seamless pipes shall be carried out in accordance with the relevant standards specified in the contract.
2. Purpose 2.1. Seamless pipes have a wide range of applications. Seamless pipes for general purposes are rolled from ordinary carbon structural steel, low alloy structural steel, or alloy structural steel, with the highest yield and mainly used as pipelines or structural parts for conveying fluids.
2.2. Supply is divided into three categories based on different purposes: a. Supply is based on chemical composition and mechanical properties; b. Supplied according to mechanical properties; c. Supply according to hydraulic test. Steel pipes supplied in categories a and b, if used to withstand liquid pressure, must also undergo hydraulic testing.
2.3. There are various types of seamless pipes for specialized purposes, including seamless pipes for boilers, seamless pipes for geology, and seamless pipes for petroleum.
3. Category
3.1 Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc. according to different production methods.
3.2. There are circular pipes and irregular pipes classified according to their appearance. In addition to square tubes and rectangular tubes, special-shaped tubes also include elliptical tubes, semicircular tubes, triangular tubes, hexagonal tubes, convex tubes, Quincunx tubes, etc.
3.3. According to different materials, it can be divided into ordinary carbon structural pipes, low alloy structural pipes, high-quality carbon structural pipes, alloy structural pipes, stainless pipes, etc.
3.4. According to specific purposes, there are boiler pipes, geological pipes, petroleum pipes, etc.