As the cooling hardening less used as a gas turbine compressor blades, box annealing, quenching station racks. Parts used in the manufacture of boilers, turbines, power machinery, industrial furnace and aviation, petrochemical and other industrial sectors to work at high temperatures. In addition to these components requires high temperature strength and high temperature oxidation corrosion, according to different purposes also requires a sufficient toughness, good processability and welding, as well as certain organizational stability. Chinese production of heat-resistant steel since 1952. After the development of some new low-alloy heat resistant steel, so that pearlite heat resistant steel operating temperature up to 600 ~ 620 ℃; In addition, the development of some new low-chromium-nickel steels antioxidant. Chemical Composition: Carbon C: ≤0.08 Si Si: ≤1.00 Mn Mn: ≤1.00 sulfur S: ≤0.030 phosphorus P: ≤0.040 chromium Cr: 11.50 ~ 14.50 Mechanical Properties: Tensile strength σb (MPa): ≥410 Conditions yield strength σ0.2 (MPa): ≥177 Elongation δ5 (%): ≥20 section shrinkage ψ (%): ≥60 Hardness: ≥183HB heat treatment and microstructure specifications: Heat Specifications: annealing 780 ~ 830 ℃ air-cooled or slow cooling. Microstructure: Organizing for the ferrite.