Process for producing thick plate of plastic die steel

Abstract

The invention discloses a process for producing a thick plate of plastic die steel. The thick plate of the plastic die steel is obtained by the following steps of: pouring by using an open-close type water-cooled die casting machine, performing reasonable heating system, rolling and normalizing and annealing after rolling. Low temperature pouring and a pouring process of feeding on bottom pouring are performed, so molten steel is quickly solidified by forced cooling of circulating water; the molten steel is not born any shrinkage resistance so as to ensure that a wide surface of the die casting blank does not have any crack; the heating temperature of a steel ingot does not exceed 1,280 DEG C, so that alloy elements are fully dissolved; the rough rolling temperature is 1,100 to 1,200 DEG C, and a rough rolling stage is performed at the high temperature under high pressure; after a fine rolling stage is performed at the temperature of 950 DEG C, the finishing temperature is greater than or equal to 920 DEG C; the discharging temperature after rolling is 750 to 830 DEG C, and the steel plate is cooled in pile for 72 hours after rolling; the steel plate is normalized and annealed; and the solution temperature is about 870 DEG C, and the aging temperature is 500 to 550 DEG C, so that the thick age-hardened plastic die steel plate is obtained. After flaw detection, each performance index of the plastic die steel produced by the invention meets the requirement.

Description

technical field [0001] The invention relates to a process for preparing a thick plate of aging hardened steel, in particular to a process for producing a thick plate of plastic mold steel. Background technique [0002] With the continuous development of the manufacturing industry, the demand for thick-gauge alloy steel is increasing. The age-hardening plastic mold steel P80A has a low carbon content and a high alloy degree. Vacuum smelting and electroslag remelting processes are often used in production. It is a Ni-Cu-Al precipitation hardening high-grade mirror surface die steel, which has good cold and hot processing performance and comprehensive mechanical properties, simple heat treatment process, small deformation and high hardenability. The NAK80 die steel developed by the patent No. 200510027393.6 adopts the three-step process of "thermal forging forming + quenching + tempering". The steel ingot is obtained by the traditional die casting method, and the forging press...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of imperfect process, large investment, low plate thickness specification and high cost in the production process of plastic mold steel thick plate in the prior art, the purpose of the present invention is to provide a thick plate production process of plastic mold steel. The technology adopts split-type water-cooled die-casting machine for pouring, through reasonable heating system and rolling process, normalizing and tempering production, the plastic mold steel thick plate obtained can pass the flaw detection inspection, and all performance indicators meet the requirements

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