Material Name: Alloy structural steel
Grade: 20MnTiB
Standard: GB / T 3077-1988
● Chemical Composition:
Carbon C: 0.17 ~ 0.24
Si Si: 0.17 ~ 0.37
Mn Mn: 1.30 ~ 1.60
Sulfur S: to allow the residual content ≤0.035
Phosphorus P: to allow the residual content ≤0.035
Chromium Cr: to allow the residual content ≤0.030
Ni: to allow the residual content ≤0.030
Cu: to allow the residual content ≤0.030
Titanium 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 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:
Heat treatment specifications: quenching 860 ℃, oil cooling; tempering 200 ℃, water-cooled, air-cooled.
● Delivery status: to heat treatment (normalizing, annealing or tempering) or without heat treatment delivery, the delivery status should be specified in the contract. |
