The A998/A998M-12 steel grade is a specification for seamless and electric fusion welded steel pipe that is used for high-temperature service. This steel grade is commonly used in applications such as petroleum refineries, power plants, and industrial furnaces.
The chemical composition of A998/A998M-12 steel grade includes elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, and copper. The carbon content ensures the strength of the steel, while other elements contribute to its corrosion resistance and ability to withstand high temperatures.
In terms of mechanical properties, A998/A998M-12 steel grade has a minimum yield strength of 30,000 psi (205 MPa) and a minimum tensile strength of 48,000 psi (330 MPa). It also has a minimum elongation of 35% and a minimum reduction of area of 40%.
The standard number for A998/A998M-12 steel grade is ASTM A998/A998M-12. This standard provides guidelines for the manufacturing and testing of seamless and electric fusion welded steel pipe for high-temperature service.
In summary, the A998/A998M-12 steel grade has specific chemical composition and mechanical properties that make it suitable for high-temperature applications. It is important to adhere to the ASTM standard when specifying, manufacturing, and testing this steel grade.