Heat treatment method for high-nitrogen corrosion resistant plastic die steel
A technology of plastic mold steel and heat treatment method, applied in the field of heat treatment of mold steel, can solve the problems of severe band segregation, uneven distribution of carbides, inability to obtain excellent comprehensive mechanical properties and corrosion resistance, etc., and achieves low equipment requirements and cost. The effect of low, excellent quenching and tempering structure
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Embodiment 1
[0034] Select a steel ingot of 100mm × 100mm × 500mm, wherein the chemical element composition of the steel ingot includes: 0.54% C, 0.42% Si, 0.46% Mn, 16.91% Cr, 1.02% Mo, 0.10% Mo V, 0.24% N, the balance being Fe and unavoidable impurities.
[0035] Heat treatment is carried out in the following steps:
[0036] (1) High temperature diffusion annealing. After the anti-oxidation coating sprayed on the surface is naturally dried, install a furnace at 300°C, raise the temperature to 900°C at a rate of 60°C / h and keep it for 3 hours, then heat it to 1240°C at a rate of 100°C / h and keep it for 6 hours;
[0037] (2) Forging. Cool the steel ingot obtained through step (1) to 1130°C in the furnace at 40°C / h and then start forging. Spray water to cool to 450°C, and then air cool to obtain forgings;
[0038] (3) Spheroidizing annealing. Furnace the forging obtained in step (2) at 230°C, raise the temperature at 60°C / h to 880°C, keep it for 5 hours, then cool it down to 710°C at a r...
Embodiment 2
[0043] A steel ingot of 200mm×200mm×400mm was selected, the chemical element composition of which was the same as that of Example 1, and the following process was adopted for heat treatment.
[0044] (1) After the anti-oxidation coating sprayed on the surface is naturally dried, install a furnace at 350°C, raise the temperature to 950°C at a rate of 80°C / h and keep it for 5 hours, and then heat it to 1280°C at a rate of 120°C / h for 8 hours;
[0045] (2) Start forging by cooling at 60°C / h to 1150°C. The forging adopts the method of two piers and two pullouts, and the forging ratio is 4; the final forging temperature is 970°C. After forging, spray water to cool to 500°C, and then air cool , get forgings;
[0046] (3) Furnace the forging at 280°C, raise the temperature at 70°C / h to 900°C, hold for 5 hours, then cool down to 730°C at a rate of 35°C / h and hold for 5 hours, and finally continue to cool at a rate of 40°C / h to Out of the furnace at 600°C, air-cooled to room temperatu...
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