动车12.9级螺栓用SCM435钢的热处理及其性能

doi:10.13251/j.issn.0254-6051.2025.04.027

金属热处理 ›› 2025, Vol. 50 ›› Issue (4): 187-192.DOI: 10.13251/j.issn.0254-6051.2025.04.027

动车12.9级螺栓用SCM435钢的热处理及其性能

齐程^1,2, 王啸宇^1,2, 马金锁³, 谢家成³, 王加杰³, 杨益春³, 吴萌^1,2, 毛向阳^1,2

1.南京工程学院材料科学与工程学院, 江苏南京 211167;
2.江苏省先进结构材料与应用技术重点实验室, 江苏南京 211167;
3.南京福贝尔五金制品有限公司, 江苏南京 211111

收稿日期:2024-11-04 修回日期:2025-02-18 发布日期:2025-06-13
通讯作者: 毛向阳,教授,博士,E-mail: xiangyang@njit.edu.cn
作者简介:齐程(1999—),男,硕士研究生,主要研究方向为机械工程材料,E-mail: 1243879272@qq.com。
基金资助:
南京工程学院研究生科技创新基金(TB202417002)

Heat treatment and properties of SCM435 steel for 12.9 grade bolts used in high-speed trains

Qi Cheng^1,2, Wang Xiaoyu^1,2, Ma Jinsuo³, Xie Jiacheng³, Wang Jiajie³, Yang Yichun³, Wu Meng^1,2, Mao Xiangyang^1,2

1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing Jiangsu 211167, China;
2. Jiangsu Key Laboratory of Advanced Structural Materials and Applied Technology, Nanjing Jiangsu 211167, China;
3. Nanjing Fuberier Metal Products Co., Ltd., Nanjing Jiangsu 211111, China

Received:2024-11-04 Revised:2025-02-18 Published:2025-06-13

摘要/Abstract

摘要： 针对12.9级高强度动车用螺栓,研究了螺栓用SCM435钢的热处理工艺及其力学性能、耐延迟断裂性能和高周疲劳性能。结果表明,SCM435钢的最佳淬回火工艺为880 ℃×30 min淬火+500 ℃×60 min回火,该工艺处理试样的性能达到12.9级螺栓的强塑性要求。最佳热处理工艺下,螺栓钢试样延迟断裂强度比DFSR为0.69;经拉-拉疲劳试验测得,应力级别为3级,拉-拉疲劳强度为(756±441) MPa。

关键词: SCM435钢, 12.9级螺栓, 热处理, 力学性能, 耐延迟断裂性能, 高周疲劳性能

Abstract: For 12.9 grade high strength bolts used in high-speed trains, the heat treatment process of SCM435 steel for the bolts and its mechanical properties, delayed-fracture resistance, and high-cycle fatigue property were studied. The results show that the optimal quenching and tempering process for the SCM435 steel is quenching at 880 ℃ for 30 min followed by tempering at 500 ℃ for 60 min. The properties of the specimens treated by the process meet the strength and plasticity requirements of 12.9 grade bolts. Under the optimal heat treatment process, the delayed-fracture strength ratio (DFSR) of the bolt steel specimens is 0.69. Through the tension-tension fatigue test, the stress level is grade 3, and the tension-tension fatigue strength is (756 ± 441) MPa.

Key words: SCM435 steel, 12.9 grade bolts, heat treatment, mechanical properties, delayed-fracture resistance, high-cycle fatigue property

中图分类号:

TG142.4

齐程, 王啸宇, 马金锁, 谢家成, 王加杰, 杨益春, 吴萌, 毛向阳. 动车12.9级螺栓用SCM435钢的热处理及其性能[J]. 金属热处理, 2025, 50(4): 187-192.

Qi Cheng, Wang Xiaoyu, Ma Jinsuo, Xie Jiacheng, Wang Jiajie, Yang Yichun, Wu Meng, Mao Xiangyang. Heat treatment and properties of SCM435 steel for 12.9 grade bolts used in high-speed trains[J]. Heat Treatment of Metals, 2025, 50(4): 187-192.

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动车12.9级螺栓用SCM435钢的热处理及其性能

Heat treatment and properties of SCM435 steel for 12.9 grade bolts used in high-speed trains

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