Alloy Steel: 15CrMo
Standard: GB / T 3077-1988
● Features and application:
Good welding process performance and performance in the 500 ~ 550 ℃ under high rupture strength. Temperature exceeds 550 ℃, deterioration of oxidation resistance, creep strength significantly reduced. Long period of 500 ~ 550 ℃, the strength of steel to reduce heat, lower intensity. 510 ℃ for the manufacture of high-, medium-pressure steam pipe, collection boxes and wall temperature of 550 ℃ superheater and forgings.
● Chemical Composition:
Carbon C: 0.12 ~ 0.18
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.40 ~ 0.70
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.80 ~ 1.10
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.40 ~ 0.55
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 440 (45)
Yield strength σs (MPa): ≥ 295 (30)
Elongation δ5 (%): ≥ 22
Reduction of area ψ (%): ≥ 60
Impact energy Akv (J): ≥ 94
Impact toughness αkv (J/cm2): ≥ 118 (12)
Hardness: ≤ 179HB
Sample size: sample blank size of 30mm
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 900 ℃, air-cooled; tempering 650 ℃, air-cooled.
Microstructure: ferrite + pearlite + small amount of bainite
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.