The seamless steel pipe material used for steam piping usually depends on the pressure and temperature of the steam. The following are several seamless steel pipe materials commonly used according to different pressure and temperature conditions:
Low pressure steam pipe(Pressure 2.0 MPa or less):
20#seamless steel pipe: This is a carbon structural steel with good comprehensive mechanical properties, suitable for low pressure steam system.
Medium pressure steam pipe(pressure 2.0 MPa to 4.0 MPa):
20G seamless steel pipe: It is also a carbon structural steel, but has better heat resistance than 20#steel.
15CrMo seamless steel pipe: This is a low alloy steel, containing chromium and molybdenum elements, with good high temperature strength and oxidation resistance.
High pressure steam pipeline(Pressure 4.0 MPa or more):
Chrome molybdenum steel seamless steel pipe: For example, P11, P22, etc. This type of steel contains a higher proportion of chromium and molybdenum, which can withstand higher temperatures and pressures.
Stainless steel seamless steel pipe: Such as 304 or 316 stainless steel, suitable for high pressure and high temperature environment, with excellent corrosion resistance.
In addition to the above materials, there are certain standards of steel tubing, such as A213 tubing under the ASTM standard, which covers a wide range of seamless ferritic and austenitic stainless steel tubing for high temperature services.
It should be noted that when choosing steam pipe materials, the operating temperature of the pipe should also be considered, and if the temperature is below 450 degrees Celsius, 20-gauge steel may be sufficient. Pressure affects the thickness of the tube wall more than the material itself. At the same time, the external protection of the pipe and the choice of insulation materials are also important to ensure the thermal efficiency and safety of the pipe.
In the specific project, the final material selection should be determined with reference to relevant engineering standards and design specifications, such as ASME, DIN, GB, etc., and the requirements of local technical supervision bureaus.