About Grades: 1Cr5Mo Standard: GB / T 1221-1992 Features and Scope 1Cr5Mo heat-resisting steel resistant to corrosion cracking of oil generated in the process, 1Cr5Mo then superheated steam is used as heat-resistant steel pipe, oil cracking pipe, hangers boiler, steam turbine cylinder liner, pump parts, valves, piston, high-pressure hydrogenation equipment parts, fasteners. ● Chemical Composition: Carbon C: ≤0.15 Si Si: ≤0.50 Mn Mn: ≤0.60 sulfur S: ≤0.030 phosphorus P: ≤0.035 chromium Cr: 4.00 ~ 6.00 Ni-Ni: ≤0.60 Mo Mo: 0.45 ~ 0.60 Mechanical Properties Tensile strength σb (MPa): quenching and tempering, ≥590 Conditions yield strength σ0.2 (MPa): quenching and tempering, ≥390 Elongation δ5 (%): quenching and tempering, ≥18 Hardness: annealing, ≤200HB treatment specifications heat treatment and microstructure specifications: 1) quenching, 900 ~ 950 ℃ oil cooling; 2) tempering, 600 ~ 700 ℃ air cooling. Microstructure: Organizing for the martensitic. Delivery status generally regulate heat treatment delivery, the treatment types specified in the contract; not indicated, by not heat treatment delivery.