China Cr4W2mov - Spring steel - Shanghai Zhilian steel trade

Cr4W2MoV Cr4W2MoV is a new type of alloy steel, cold work tool steel, the performance is stable over the life of the mold Cr12, Cr12MoV steel is greatly improved. Cr4W2MoV steel main characteristics of eutectic carbides small, evenly distributed, with high hardenability and hardenability, and has good wear resistance and dimensional stability. The narrow temperature range of thermal processing of steel, the deformation resistance larger. The actual performance proved Cr4W2MoV steel is a good cold-working die steel used to manufacture a variety of dies, cold heading die, blanking die, cold extrusion die and mold work fell silk panels.

Cr4W2MoV steel chemical composition shown in Table 2-6-1.

Table 2-6-1 Cr4W2MoV chemical composition of steel (GB / T 1299-2000) ω /%

C	Si	Mn	Cr	W	Mo	V	P	S
1.12~ 1.25	0.40~ 0.70	≤0.40	3.50~ 4.00	1.90~ 2.00	0.80~ 1.20	0.80~ 1.10	≤0.030	≤0.030

　More difficult to soften the steel annealing, the general isothermal annealing of the ball.
Annealing process:
Heating temperature of 850 ~ 870 degrees, heat 4 ~ 6H, isothermal temperature of 760 degrees, heat 6 ~ 8H, furnace cool to 600 degrees below baked cooled, hardness 229HBW.
Quenching temperature of 960 ~ 980 degrees, oil-cooling or air-cooled, hardness 62HRC; tempering temperature of 280 to 300 degrees, tempering 3 times, each time 1H. Tempering hardness 60 ~ 62HRC.
High-temperature quenching, tempering temperature (1030 degrees quenching, tempering 520 degrees three times) of the die steel with high wear resistance and hot hardness. A lower temperature quenching, low temperature tempering (900 ~ 980 degrees quenching, tempering 200 ~ 290 degrees) of the mold has good strength and toughness.

Cr4W2MoV critical temperature of steel are shown in Table 2-6-2. Table 2-6-2 Cr4W2MoV critical temperature of steel

Critical point	Ac1	Acm	Ar1	Ms
Temperature (approximate) / ℃	795	900	760	142