When the tempering temperature is lower than 450 °C, cementite is precipitated in the GB/T 3077 12Cr1MoV alloy steel sheet; the cementite is dissolved above 450 °C, and the dispersion-stabilized refractory carbides Mo2C, W2C, VC, etc. are precipitated in the 12Cr1MoV steel to make the hardness Re-raised, called precipitation hardening. Secondary quenching of residual austenite to martensite during cooling during tempering of GB/T 3077 12Cr1MoV steel plate can also cause secondary hardening. The reason for the secondary hardening effect is the transformation of the retained austenite of the alloying elements and the precipitation hardening in the 12Cr1MoV steel plate. These conditions are only effective in the presence of high levels of other alloying elements due to the formation of diffusely distributed intermetallic compounds.
The GB/T 3077 12Cr1MoV steel plate mechanical properties
|
Grade |
Tensile strength σb/MPa |
Yield strength σ 0.2 ≥/MPa |
Elongation δ5≥(%) |
HBS |
HRC |
|
12Cr1MoV |
231 |
154 |
56 |
235-268 |
30 |
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