Thermal treatment method for high-nitrogen high-corrosion-resistance plastic mould steel
A technology of plastic mold steel and heat treatment method, applied in heat treatment equipment, manufacturing tools, quenching agent, etc., can solve the problems of high cost, unsatisfactory corrosion resistance, expensive alloy elements of plastic mold steel, etc., and achieve low production cost, durable The effect of excellent corrosion performance
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[0029] Example 1
[0030] The die steel in Example 1 is obtained by forging a steel ingot, with a cross-sectional size of 100mm (thickness) × 600mm (width), and the chemical composition of the die steel is C 0.37%, Si 0.32%, Mn 0.55%, Cr 13.3%, Ni 0.18% , Mo 0.06%, N0.07%, P 0.022%, S 0.004%, the rest is Fe.
[0031] (1) Spheroidizing annealing
[0032] Put the die steel into the annealing furnace from room temperature, heat it up to 960°C at a rate of 100°C / h, hold it for 10 hours, then cool it to 740°C at a cooling rate of 40°C / h, hold it for 7 hours, and finally, at 40°C / h The cooling rate is cooled to 500℃, and air-cooled to room temperature after exiting the furnace. The resulting metallographic structure is as figure 1 Shown.
[0033] (2) Salt bath quenching
[0034] Put the spheroidized annealed die steel obtained in step (1) into a quenching furnace at room temperature, and heat up to 750±10°C at a rate of 100°C / h. After holding for 3.5h, continue to press 100°C / h It is heate...
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[0038] Example 2
[0039] The die steel in Example 2 is obtained by forging a steel ingot, with a cross-sectional size of 100mm (thickness) × 600mm (width), and the chemical composition of the die steel is C 0.33%, Si 0.320%, Mn 0.52%, Cr 13.8%, Ni 0.16% , Mo 0.05%, N0.065%, P 0.022%, S 0.004%, the rest is Fe.
[0040] (1) Spheroidizing annealing
[0041] Put the die steel into the annealing furnace from room temperature, heat it up to 950℃ at a rate of 90℃ / h, keep it for 9h, then cool it to 740℃ at a cooling rate of 40℃ / h, keep it for 6h, and finally, at 40℃ / h The cooling rate is cooled to 500℃, and air-cooled to room temperature after exiting the furnace. The resulting metallographic structure is as figure 1 Shown.
[0042] (2) Salt bath quenching
[0043] Put the spheroidized and annealed die steel obtained in step (1) into a quenching furnace at room temperature, and heat it up to 750±10°C at a rate of 90°C / h. After holding for 3.5 hours, continue to press 90°C / h It is heated to ...
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