Plastic mould steel and processing technology thereof
A plastic mold and processing technology, applied in the field of alloy steel processing, can solve the problems of high steel prices and increased manufacturing costs of automobile products, and achieve cost reduction, high polishing performance and processing performance, and uniform internal hardness and surface hardness Effect
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Embodiment 1
[0022] Embodiment 1, a kind of processing technique of plastic mold steel, this technique comprises the steps:
[0023] Step S1, smelting: batching, electric arc furnace smelting and refining according to the chemical composition and mass percentage of high-hardness and high-polish pre-hardened plastic mold steel;
[0024] Step S2, high-temperature diffusion heat treatment: the heating temperature is 1150-1250°C, and the holding time is 15-20h;
[0025] Step S3, forging thermal processing: cooling the steel ingot that has undergone high-temperature diffusion heat treatment to 950-1100°C, and performing multi-directional forging processing within this temperature range, adopting the two-upsetting and two-drawing forging method, the total forging compression ratio is ≥3, and the final forging temperature is ≥850℃;
[0026] Step S4, heat treatment after forging: air cooling after forging, and then normalizing treatment in a normalizing furnace, heating temperature 880-950°C, hea...
Embodiment 2
[0033] Embodiment 2, a processing technology of plastic mold steel, differs from Embodiment 1 in that the casting process is that the molten steel in the refining furnace is tapped out by crane ladle, and cast in a vacuum chamber for blowing. Argon, with a second vacuum treatment.
Embodiment 3
[0034] Embodiment 3, a processing technology of plastic mold steel, differs from Embodiment 1 in that in the step S7, after the hydrogen expansion annealing is completed, secondary normalizing is performed to further refine the grains.
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