30CrNi3Mo is an alloy structural steel. The 30CrNi3Mo steel plate is heat treated by high temperature tempering.

Alloy structural steel 30CrNi3Mo plate heat treatment specification and metallographic structure:
Heat treatment specification: 840-860℃ oil quenching + 520～590℃ tempering, oil cooling.
Metallographic structure: 1) Martensite after quenching;
2) After quenching and high temperature tempering, it becomes tempered sorbite.

30CrNi3Mo steel chemical composition:

C	Si	Mn	S	P	Cr	Ni	Mo
0.30-0.40	0.17-0.37	0.50-0.80	≤0.020	≤0.025	1.10-1.70	2.75-3.25	0.25-0.40

30CrNi3Mo steel mechanical properties:

Tensile strength	Yield Strength	Elongation	Rate of reduction in area	Impact toughness value	Hardness
755-900	590-785	12-14	32-40	32-55	241-341HB

30CrNi3Mo steel has high hardenability. After quenching and high temperature tempering, uniform strength, high plasticity, toughness, fatigue strength, low cold brittle transition temperature and notch sensitivity can be obtained on a large section.

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