Deng Xiangyang, Lin Jun, Li Shichao, Pang Zhuochun, Li Daming

is concluded in this research that strength and toughness of steel can be significantly improved by precipitation strengthening and fine-grained strengthening after adding trace alloying elements of V, Nb and Ti in steel and combining with C and N in steel. Based on the thermodynamic calculation software, the V, Nb and Ti composite microalloying design of non-quenched & tempered 46MNVS6 steel was realized. At the same time, the rolling heating process dissolved the liquid phase of the large particles and realized the high strength design of the material. In addition, the special slag system of non- quenched & tempered steel with low and medium basicity was developed through the simulation calculation of refining slag system, which ensured the precise control of S element in the refining process. The results show that non- metallic inclusions control in non- quenched & tempered steel and the sulfide morphology are optimized, and cutting performance of the material is improved.

Abstract：it Key words: Fine grain size strengthening, Strong toughness, Slag system, Cutting performance

42CRMOA

不少零件重新启用了性能更优的 调质

900 MPA

钢，但是国外已经研发出屈服强度高于 、

1 100 MPA

抗拉强度高于 的非调质钢，因此，国内钢厂急需研发出强度等级更高的非调质钢以适应新形势要求。

钢中各元素的作用

在微合金非调质钢中，V、NB、TI等微合金元

作者简介：邓向阳（1982—），男，高级工程师，硕士学位，主要研究方向为汽车用钢的研发。

参考文献引用格式：邓向阳, 林俊, 李仕超, 等.

（Zenith Steel Group Co., Ltd., Changzhou 213011）

2

一种高强度汽车胀断连杆用非调质钢的研发[J]. 2024(3): 40-46.

DENG X Y, LIN J, LI S C, et al. Research of A High Strength Non-quenched and Tempered Steel for Fracture Splitting Connecting Rod of Automo⁃ bile[j]. Automobile Technology & Material, 2024(3): 40-46.

汽车工艺与材料,