Highly-polished prehardened die steel, and preparation method thereof
A preparation process and pre-hardening technology, which is applied in the field of alloy steel, can solve the problems of strict polishing process requirements, many mold manufacturing processes, and increased manufacturing costs, and achieve high polishing performance, good polishing performance, and the effect of improving grain refinement
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[0025] Example
[0026] In this embodiment, the composition and mass percentages of the high-polished pre-hardened die steel are as follows: C0.25%, Si 0.15%, Mn 1.60%, Cr 1.70%, Ni 0.90%, Mo 0.50%, V 0.07%, P 0.012%, S 0.002%, Nb 0.03%, Fe balance.
[0027] The process and steps of using the materials in this embodiment to produce high-polished pre-hardened die steel are as follows:
[0028] (1) Smelting: according to the composition of high-polished pre-hardened die steel and its mass percentage, do the batching, electric arc furnace smelting and refining, then vacuum degassing and casting, and finally demoulding and hot delivery to the forging furnace;
[0029] (2) High temperature diffusion heat treatment: The steel ingot is heated in a forging furnace in stages, namely at 600℃, 800℃, and 1100℃ respectively, and finally heated to 1180~1250℃, and the holding time is 10~20h after the temperature is uniform. ;
[0030] (3) Forging hot processing: the steel ingot after high temperatur...
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