锻压技术

抗氧化免镀层热成形钢扭力梁高温气胀成形工艺

英文标题：High-temperature gas bulging process of anti-oxidant and coating-free hot forming steel torsion beam

单位：1. 本钢集团有限公司技术中心先进汽车用钢开发与应用技术国家地方联合工程实验室 2. 哈尔滨工业大学（威海）材料科学与工程学院 3. 本钢板材股份有限公司

分类号：TG306

出版年,卷(期):页码：2025,50(8):113-122

摘要：

为解决传统22MnB5钢扭力梁构件气胀热成形过程中对模具冷却能力要求高，但由于材料抗高温氧化性能较差，致使气胀成形后管件内壁氧化铁皮难以去除的应用痛点，使用本钢集团有限公司抗氧化免镀层热成形钢，应用两种工艺方案进行扭力梁样件试制。结果分析表明：采用预成形+气胀整形方案的样件的截面形状及尺寸精度较高，扭力梁样件的微观组织可实现完全马氏体化，且样件的拉伸屈服强度和抗拉强度分别达到1300和1700 MPa以上，伸长率大于7%。此外，成品表面富Cr、Si的氧化层厚度小于1 μm，附着性极佳。

In order to solve the application pain points that the traditional torsion beam components of 22MnB5 steel had stringent requirements on die cooling capacity during the gas bulging hot forming process, and the material had poor resistance to high-temperature oxidation, which made it difficult to remove the oxide scale on the inner wall of pipe after gas bulging, two process schemes were applied for the torsion beam sample trial manufacturing asing the anti-oxidation and coating-free hot-formed steel of Bensteel Group Co., Ltd. The result analysis shows that the cross-sectional shape and dimensional accuracy of the samples produced by the preforming + gas bulging shaping process are relatively high, the microstructure of the torsion beam samples can be completely martensitic, and the tensile yield strength and tensile strength of the samples reach more than 1300 and 1700 MPa respectively, with the elongation exceeding 7%. In addition, the thickness of Cr- and Si-rich oxide layer on the surface of the finished product is less than 1 μm, and the adhesion is excellent.

基金项目：

国家自然科学基金资助项目（52275319）；山东省重大科技创新工程项目（2021SFGC0902）

作者简介：王飞（1981-），男，硕士，高级工程师 E-mail：ekin55@126.com 通信作者：姚圣杰（1982-），男，博士，教授 E-mail：shj_yao@163.com

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