汽车转向横拉杆用钢的研究及应用进展

Research and Application Progress of Steel for Automobile Steering Tie Rod

叙述了国内外常用冷挤压成型工艺的转向横拉杆用钢的应用现状及加工工艺,介绍了横拉杆用普通调质钢、预调质钢及非调质冷镦钢产品的主要技术指标和对应生产的零件性能。生产实践表明,相比普通调质钢MI40Cr和预调质钢ESW90,非调质冷镦钢30MnVS6生产的汽车转向横拉杆强度和塑性可达同等水平,但冲击韧性明显偏低;从化学成分、显微组织、非金属夹杂物及偏析四方面探讨了提升非调质冷镦钢强韧性的研究进展情况,通过正火处理30MnVS6钢的KV2冲击功由热轧态6267 J提高至108115 J。

The application status and processing technology of cold extrusion forming steel for steering tie rod at home and abroad are described.The main technical indicators and the performance of the corresponding parts of ordinary quenched and tempered steel,pre-quenched and tempered steel and non-quenched and tempered cold heading steel for steering tie rod are introduced.Production practice shows that compared with ordinary quenched and tempered steel ML40 Cr and pre-quenched and tempered steel ESW90,the strength and plasticity of automobile steering tie rods produced by non-quenched and tempered cold heading steel 30 MnVS6 can reach the same level,but the impact toughness is significantly lower.The research progress of improving the strength and toughness of non-quenched and tempered cold heading steel is discussed from the four aspects of chemical composition,microstructure,non-metallic inclusion and segregation.By normalizing treatment the impact energy KV2 of steel 30 MnVS6 increases from hot-rolled status 6267 J to 108115 J.