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METHOD FOR PRODUCING TOOL STEEL AND PLASTIC-MOLDING DIE STEEL 发明申请

2023-05-20 2540 58K 0

专利信息

申请日期 2025-07-11 申请号 JP2003404705
公开(公告)号 JP2005163123A 公开(公告)日 2005-06-23
公开国别 JP 申请人省市代码 全国
申请人 DAIDO STEEL CO LTD
简介 PROBLEM TO BE SOLVED : To provide a producing method which can obtain a blank (ordinarily, a flat blank or a bar wire rod) in which the crystal grain at the completing time of austenizing is made finer than heretofore and the growth of this fine austenitic crystal grain is slow and is hardly coarsened in the heat treatment step after hot-working in the case of producing the blank for manufacturing a finish-product from a tool steel and a plastic-molding die steel. SOLUTION : A steel having a structure consisting of martensite (M) or the martensite (M) and bainite (B) by cooling after hot-working is hot-worked in the austenite (γ) single phase (1), is successively hot-worked to hinder the re-crystallization of γ-structure (2), is cooled at once to obtain the fine structure having ≤30μm average crystal grain diameter (3), is subjected to re-quenching treatment or solution heat treatment and then cooled to obtain the structure mainly consisting of the martensite (M) or the bainite (B) (4), and is subjected to heat treatment (tempering or aging treatment) (5).


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