30CrMo steel, a type of alloy steel in China, 30 refers to the carbon content. It is used to make high-strength bolts of 10.9s 8.8s. However, before use, it must be tested to confirm its composition content before it can be used safely. Chinese brand
30CrMo is equivalent to Japanese SCM430.
30CrMo steel 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 steel Physical properties
Sample blank size (mm) : 25
Heat treatment:
First quenching temperature (℃) : 880; Coolant: water, oil
The second quenching temperature (℃) : -
Tempering temperature (℃) : 540; Coolant: water, oil
Sigma b/MPa: ≥930
Sigma /MPa: ≥785
Elongation after breaking (5/%) : ≥12
A reduction of area (bits / %) : 50 or more
Shock absorption work (Aku2/J) : ≥63
Brinell hardness (hbs100/3000) (annealed or tempered at high temperature) ≤229
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