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引言 低碳马氏体型超高强度钢是综合了国内低碳马氏体钢的高韧性和国外超高强度钢的高强度特点而发展的新型钢种。从目前试验得出的结果来看,研制中的Si-Mn-Cr-Ni系低碳马氏体钢具有性能好、成本低和结合我国资源的优点。为了获得比较理想的强韧配合,试验钢的合金元素配比、热处理工艺和钢的组织必须满足一定的要求。本文所采用的25Si2Mn2NiMoVNb钢和25SiMn2CrNiMoV钢的成分已由回归分析设计确定。这里仅对其热处理工艺及组织与强韧性的关系进行详细说明。
Introduction Low-carbon martensitic ultra-high strength steel is a new type of steel developed by combining the high toughness of domestic low-carbon martensitic steel and the high strength of ultra-high strength steel abroad. Judging from the results of the current tests, the developed Si-Mn-Cr-Ni low-carbon martensitic steel has the advantages of good performance, low cost and combination of resources in our country. In order to obtain the ideal tough combination, the alloying elements of the test steel, heat treatment process and the organization of the steel must meet certain requirements. The composition of 25Si2Mn2NiMoVNb steel and 25SiMn2CrNiMoV steel used in this paper has been determined by regression analysis design. Here only the heat treatment process and the relationship between strength and toughness are described in detail.