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12CrNi3 steel is alloyed with carbon steel, which has a higher quenching property than 12CrNi2A steel. Therefore, it can be used to manufacture parts that are slightly larger than the 12CrNi2A steel. The hardened steel tempered at low temperature or high temperature tempering after has good comprehensive mechanical properties and good low temperature toughness of the steel, the small notch sensitivity, good cutting properties. When the hardness is HB260 to 320, relative machinability is 60% ~ 70 also low hardness of steel after annealing, good plasticity. Thus, the utility model can by cutting machining method to manufacture the mold, can also be used in cold extrusion molding method for manufacturing mold. In order to improve the wear resistance of the mold cavity, the mold needs for carburization, and then quenched and tempered at low temperature, so as to ensure the mold surface with high hardness, high wear resistance and heart department has a very good toughness, the steel suitable large and medium-sized plastic mold manufacturing. But the steel temper brittleness tendency and the formation of white spots.
Characteristic and applicable scope
It is widely used in high - carbon steel, compared with 15Cr and 20Cr steel, the strength, plasticity and quenching of the high - carbon steel are high. Mainly used to produce high strength requirements under the condition of heavy load, high hardness and high toughness of spindle and center toughness is high or under impact load, surface abrasion resistance, heat treatment deformation small shaft, rod and under high speed and impact load of various transmission gear, adjusting screw, a cam shaft
Chemical composition
Silicon Si:0.17 ~ 0.37
Mn Mn:0.30 ~ 0.60
S: allow residual sulfur content less than 0.035
P P: allow residual content less than 0.035
Chrome Cr:0.60 ~ 0.90
Nickel Ni:2.75 ~ 3.15
Cu: allow residual copper content is less than 0.030
Mechanical properties
The ultimate tensile strength of B (MPa): 930 (95)
Yield strength s (MPa): 685 (70)
5 elongation (%): 11
Section shrinkage (%): 50 psi
The impact of Akv (J): 71
The impact toughness value of alpha kV (J/cm2): 88 (9)
Hardness: 217HB
Sample size: the sample size is 15mm
The specification of heat treatment and microstructure:
Heat treatment specification: quenching: the first 860, 780 second, oil cooling, tempering 200, water cooling, air cooling.
] delivery status: to heat treatment (normalizing, annealing or tempering) with or without heat treatment delivery, delivery status should be indicated in the contract.

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