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Material Name: Alloy Steel Grade: 20MnTiB Standard: GB / T 3077-1988 ● Chemical Composition: Carbon C: 0.17 ~ 0.24 Si Si: 0.17 ~ 0.37 Manganese Mn: 1.30 ~ 1.60 Sulfur S: to allow the residual content of ≤ 0.035 Phosphorus P: allow the residual content ≤ 0.035 Chromium Cr: allow the residual content ≤ 0.030 Ni: to allow the residual content of ≤ 0.030 Copper Cu: to allow the residual content ≤ 0.030 Ti Ti: 0.04 ~ 0.10 Boron B: 0.0005 ~ 0.0035 ● Mechanical Properties: Tensile strength σb (MPa): ≥ 1130 (115) Yield strength σs (MPa): ≥ 930 (95) Elongation δ5 (%): ≥ 10 Reduction of area ψ (%): ≥ 45 Impact energy Akv (J): ≥ 55 Impact toughness αkv (J/cm2): ≥ 69 (7) Hardness: ≤ 187HB Sample size: Sample size is 15mm rough ● Heat treatment and microstructure specifications: Standard heat treatment: quenching 860 ℃, oil cooling; tempering 200 ℃, water, air-cooled. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. |
