Softening treatment of moderate alloy nickle serial cold working mold steel
A technology of cold working die steel and softening treatment, which is applied in the field of softening treatment of die steel in the metallurgical industry. It can solve the problems of low production efficiency, high metallurgical manufacturing cost, and long softening treatment time, so as to achieve high productivity, reduce metallurgical manufacturing cost, Simple and reasonable softening effect
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[0013] A certain iron and steel company implements the patent of the invention, and softens the forging material of medium-alloy nickel-based cold work die steel, and uses 4% Ni-Cr forging material (the chemical composition of the die steel is: carbon 0.40%-0.50%; silicon 0.10% -0.40%; manganese 0.15%-0.45%; chromium 1.20%-1.50%; molybdenum 0.15%-0.35%; nickel 3.80%-4.30%; phosphorus ≤ 0.030%; When hot-working finished products, the final forging temperature is controlled at 870-890°C; secondly, the forged hot-processed die steel forgings are naturally cooled to room temperature in the air, and placed for 3-4 hours; thirdly, the forgings are moved into In the heating furnace, heat at a heating rate of 90°C / h to a temperature of 660-680°C for 30 hours; fourth, remove the material from the furnace and air-cool to room temperature. For the softened 4% Ni-Cr forging material, the time is shortened by 50%, and the physical hardness test (see T...
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