On the issue of Cr4W2MoV heat treatment specification, Longtuo Metal Technology Department will start this today. The main content of this paper will involve the performance of Cr4W2MoV material, Cr4W2MoV heat treatment specification process and points for attention.
Cr4W2MoV die steel is a high alloy tool steel and good wear-resistant, micro-deformed cold working die steel, which is a new type of alloy cold working die steel developed by our country. The steel is a substitute steel developed for the shortcomings of Cr12 die steel, which has good wear resistance and second hardening ability. The eutectic carbide of the steel has fine particles, uniform distribution, high hardenability and good dimensional stability of wear resistance. However, the hot working temperature range of steel is narrow and the deformation resistance is large.
Hot working specification
The starting temperature is 1050 ° C and the ending temperature is 850 ° C.
Specification for isothermal spheroidizing annealing of blank
(900±10) ℃×3~4h, furnace cooling, (740±760) ℃×6~8h, oven air cooling, hardness ≤255HBW, eutectic carbide grade ≤2.
Standard for ordinary isothermal annealing
Annealing temperature (850±10) ℃, isothermal temperature (750±10) ℃, air cooling.
General quenching, tempering specification
Preheating temperature 960~980℃, quenching temperature 1020~1040℃, oil cold, hardness 60HRC, tempering temperature 280~300℃ or 500~540℃.
Single hardening specification
Quenching temperature (970±10) ℃, oil cold, tempering temperature 200℃/500℃, hardness 58~62HRC.
Secondary hardening specification
Quenching temperature (1030±10) ℃, oil cold, tempering temperature 500~520℃, hardness 61HRC.
High temperature quenching + high temperature tempering process
1020~1040℃ quenching, 500~540℃×1h×3 times tempering. It has good wear resistance, good thermal rigidity, good dimensional stability and is conducive to chemical heat treatment.
Fractional quenching specification
960~980℃ quenching, fractional cooling, 280~320℃×1h×2 times tempering. It is suitable for die steel requiring good strength and toughness and strict deformation requirements.
