NB47027 bolt alloy structural steel
NB47027 bolt alloy structural steel has high static strength, impact toughness, and fatigue limit. Its hardenability is higher than 40Cr, and it has high 35CrMo creep strength and endurance strength at high temperatures. Its long-term working temperature can reach 500 ℃; During cold deformation, the plasticity is moderate and the weldability is poor. Used as important structural components for working under high loads, such as transmission components for vehicles and engines; The rotor, main shaft, heavy-duty transmission shaft, and large cross-section components of a steam turbine generator
Chemical composition of NB47027 bolt:
Carbon C: 0.32~0.40
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: 0.15~0.25
Mechanical properties of NB47027 bolt:
Tensile strength σ b (MPa): ≥ 985 (100)
Yield strength σ s (MPa): ≥ 835 (85)
Elongation rate δ 5 (%): ≥ 12
Shrinkage rate of cross-section (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value α kv (J/cm2): ≥ 78 (8)
Hardness: ≤ 229HB
Sample size: The sample blank size is 25mm
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