Alloy steel pipe plant: P22 alloy pipe material properties The chemical composition of the most commonly used alloy heat-resistant steel, durable plastic is good, when the elongation reaches 3% -5% only began to creep the third stage. Widely used in thermal power, nuclear power, petrochemical heating surface pipes. application: Superheater tubes with a wall temperature below 580°C and headers and steam pipes with a wall temperature below 570°C. Related standards: US T22 ASTM213/233, P22 ASTM A335 Germany DIN17175-79 China GB5310-95 GB6479-2000 Japan JIS3462-88 JIS3467-88 JIS3458-88