30CrMo steel with high strength and toughness, high hardenability, quenching in the oil critical diameter of 15 ~ 70mm; steel thermal strength is better, below 500 ℃ with sufficient high temperature strength, but 550 ℃ when its The strength is decreased significantly; when the 30CrMo alloy elements in the lower limit of welding is quite good, but close to the upper limit of welding medium, and to be preheated to more than 175 ℃; 30CrMo steel can be machinable, cold deformation of plastic medium; In the heat treatment, there is a first type of temper brittleness in the range of 300 to 350 ° C.
30CrMo Chemical composition:
C：0.26～0.34
Si：0.17～0.37
Mn：0.40～0.70
Cr：0.80～1.10
Mo：0.15～0.25
P：≤0.035
S：≤0.035
Ni：≤0.030
Cu：≤0.030
30CrMo Heat treatment [Sample blank size (mm): 25]:
The first quenching heating temperature (℃): 880; Coolant: water, oil
Second quenching heating temperature (℃): -
Tempering heating temperature (℃): 540; Coolant: water, oil
Tensile strength (σb / MPa): ≥930
Yield point (σs / MPa): ≥785
Elongation at break (δ5 /%): ≥12
Section shrinkage (ψ /%): ≥50
Impact absorption work (Aku2 / J): ≥63
Brinell hardness (HBS100 / 3000) (annealing or high temperature tempering state) ≤ 229
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