15CrMo steel is alloy structural steel with high thermal strength (δb≥440MPa) and oxidation resistance at high temperature, and has a certain resistance to hydrogen corrosive ability. The executive standard of 15CrMo steel is GB/T 3077-2006. Due to the high content of Cr, C and other alloying elements in the steel, the hardening tendency of the steel is obvious and the weldability is poor.
Chemical composition of 15CrMo steel :
Carbon C: 0.12～0.18
Silicon Si: 0.17～0.37
Manganese Mn: 0.40～0.70
Sulfur S: allowable residual content ≤0.035
Phosphorus P: Allowable residual content≤0.035
Chromium Cr: 0.80～1.10
Nickel Ni: allowable residual content ≤0.030
Copper Cu: allowable residual content ≤0.030
Molybdenum Mo: 0.40～0.55
Mechanical properties of 15CrMo steel:
Tensile strength σb (MPa): ≥440(45)
Yield strength σs (MPa): ≥295(30)
Elongation δ5 (%): ≥22
Area shrinkage ψ(%): ≥60
Impact energy Akv (J): ≥94
Impact toughness value αkv (J/cm2): ≥118(12)
Hardness: ≤179HB Sample size: sample blank size is 30mm
Application examples
15CrMo steel is widely used in petroleum, petrochemical, high-pressure boilers, etc., special-purpose seamless pipes include seamless pipes for boilers, seamless steel pipes for geological use, and seamless pipes for petroleum.
