30Mn2, alloy structural steel.
During cold deformation, the plasticity is moderate, and the machinability and weldability are still acceptable, but the parts need to be preheated to above 200 ℃ before welding. The wire drawing, cold heading, and heat treatment processes have good performance and high hardenability. The critical hardenability diameter in oil is 6.5-18mm, and the quenching deformation is small, but there are overheating, decarburization sensitivity, and tempering brittleness. This steel has high strength, toughness, and wear resistance after quenching and tempering, and also has good static strength and fatigue strength.
Standard: GB/T 3077-1988
Chemical composition:
Carbon C: 0.27-0.34
Silicon Si: 0.17-0.37
Manganese Mn: 1.40-1.80
Sulfur S: allowable residual content ≤ 0.35
Phosphorus P: allowable residual content ≤ 0.35
Chromium Cr: allowable residual content ≤ 0.30
Nickel Ni: allowable residual content ≤ 0.30
Copper Cu: allowable residual content ≤ 0.30
Mechanical properties:
Tensile strength σ b (MPa): ≥ 785 (80)
Yield strength σ s (MPa): ≥ 635 (65)
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)
Brinell hardness (HBS100/3000) (annealed or high-temperature tempered state): ≤ 207
Sample blank size (mm): 25
Heat treatment:
Heating temperature for secondary quenching (℃): 840; Coolant: Water
Second quenching heating temperature (℃):-
Tempering heating temperature (℃): 500; Coolant: Water
Delivery status: Delivery shall be made in a heat-treated (normalizing, annealing or high-temperature tempering) or non heat-treated state, and the delivery status shall be specified in the contract.
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