胀断连杆用中碳微合金非调质钢的表面脱碳规律

doi:10.13251/j.issn.0254-6051.2025.03.036

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 227-231.DOI: 10.13251/j.issn.0254-6051.2025.03.036

胀断连杆用中碳微合金非调质钢的表面脱碳规律

安金敏¹, 张永奇², 雷三祥¹, 王军¹, 屈小波¹, 张朝磊²

1.江苏永钢集团有限公司, 江苏张家港 215628;
2.北京科技大学碳中和研究院, 北京 100083

收稿日期:2024-11-30 修回日期:2025-01-27 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 张朝磊,副教授,博士,E-mail:zhangchaolei@ustb.edu.cn
作者简介:安金敏(1979—),男,高级工程师,主要研究方向为钢铁生产工艺优化、汽车用钢制造等,E-mail:anjinmin@yong-gang.com。

Surface decarburization behavior in microalloyed medium carbon steel for fractured splitting connecting rod

An Jinmin¹, Zhang Yongqi², Lei Sanxiang¹, Wang Jun¹, Qu Xiaobo¹, Zhang Chaolei²

1. Jiangsu Yonggang Group Co., Ltd., Zhangjiagang Jiangsu 215628, China;
2. Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China

Received:2024-11-30 Revised:2025-01-27 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 通过金相组织观察和脱碳层定量分析,研究了胀断连杆用36MnVS4和46MnVS5中碳非调质钢的表面脱碳规律。结果表明,36MnVS4和46MnVS5钢在700~1250 ℃加热60 min时表面脱碳规律是相似的,脱碳层厚度随加热温度的升高呈现先上升再下降的趋势,并均在1200 ℃时达到峰值,分别为795.4 μm和898.3 μm。与46MnVS5钢相比,36MnVS4钢的C含量低0.08%,V含量高0.128%,脱碳敏感性降低了5%~25%。可通过提高加热及冷却速度的方法,或选择远离脱碳敏感温度进行热锻,避免在脱碳敏感区停留,可有效控制脱碳层的形成。轧钢过程中的钢坯加热与连杆锻造过程,应避开峰值温度,减少停留时间。

关键词: 非调质钢, 表面脱碳, 胀断连杆, 控锻控冷

Abstract: The surface decarburization behavior of 36MnVS4 and 46MnVS5 microalloyed medium carbon steels for fractured splitting connecting rod was carried out by observing metallographic structure and quantitative analyzing decarburized layer. The results show that the surface decarburization behavior of the 36MnVS4 and 46MnVS5 steels heated at 700-1250 ℃ for 60 min is the same. The decarburized layer increases first and then decreases with the increase of heating temperature, with the maximum of 795.4 μm and 898.3 μm at 1200 ℃, respectively. Compared to the 46MnVS5 steel, the 36MnVS4 steel has a lower C content of 0.08% and a higher V content of 0.128%, and the decarbonization sensitivity decreases by 5%-25%. By accelerating the heating speed and cooling speed, or hot forging at the temperature away from the decarbonizing sensitive temperature, the decarburization can be controlled. During heating billets in rolling and forging connecting rod, it's necessary to avoid peak temperatures and reduce residence time.

Key words: microalloyed medium carbon steel, surface decarburization, fractured splitting connecting rod, thermomechanical control process

中图分类号:

TG142.1

安金敏, 张永奇, 雷三祥, 王军, 屈小波, 张朝磊. 胀断连杆用中碳微合金非调质钢的表面脱碳规律[J]. 金属热处理, 2025, 50(3): 227-231.

An Jinmin, Zhang Yongqi, Lei Sanxiang, Wang Jun, Qu Xiaobo, Zhang Chaolei. Surface decarburization behavior in microalloyed medium carbon steel for fractured splitting connecting rod[J]. Heat Treatment of Metals, 2025, 50(3): 227-231.

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胀断连杆用中碳微合金非调质钢的表面脱碳规律

Surface decarburization behavior in microalloyed medium carbon steel for fractured splitting connecting rod

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