超高强度悬架弹簧用钢55SiCrNb的工业试制

doi:10.13251/j.issn.0254-6051.2022.09.036

摘要/Abstract

摘要： 研究了过冷奥氏体连续冷却相变行为,探索了冷却速率对组织的影响,在工业生产线试制出直径ϕ16 mm热轧盘条。通过拉拔和感应热处理试制出直径ϕ14.8 mm钢丝,钢丝组织为回火屈氏体+少量回火马氏体+少量残留奥氏体,抗拉强度大于2160 MPa,断面收缩率大于44%,可用于制造强度等级为2100 MPa的弹簧。

关键词: 悬架弹簧钢, 回火屈氏体, 抗拉强度, 断面收缩率

Abstract: Continuous cooling transformation behavior of the supercooled austenite test 55SiCrNb steel was studied, and the effect of cooling rate on microstructure was clarified, and wire with a diameter of 16 mm was hot rolled via industrial production line. A strong steel wire with a diameter of 14.8 mm was fabricated through drawing and on-line induction heat treatment. The microstructure of steel wire consists of tempered troostite, a few tempered martensite and retained austenite, and exhibits tensile strength higher than 2160 MPa, and reduction of area larger than 44%, which is qualified for making springs with a strength level of 2100 MPa.

Key words: suspension spring steel, tempered troostite, tensile strength, percentage reduction of area

中图分类号:

TG142.4

陈焕德, 麻晗, 孙国才, 张宇. 超高强度悬架弹簧用钢55SiCrNb的工业试制[J]. 金属热处理, 2022, 47(9): 208-213.

Chen Huande, Ma Han, Sun Guocai, Zhang Yu. Industrial trial manufacture of 55SiCrNb steel for ultra high strength suspension spring[J]. Heat Treatment of Metals, 2022, 47(9): 208-213.

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