高品质Mn-Cr系汽车齿轮钢质量稳定性研究-中国材料进展

文章信息/Info

Title:: Study on Quality Stability of High-Quality Mn-Cr Automotive Gear Steel

作者:: 何肖飞; 郭涛; 孙鸿平; 陈武; 曹红福; 1. 钢铁研究总院有限公司特殊钢研究院，北京 100081 2. 江阴兴澄特种钢铁有限公司研究院，江苏江阴 214429 3. 钢研纳克检测技术股份有限公司，北京 100081

Author(s):: HE Xiaofei; GUO Tao; SUN Hongping; CHEN Wu; CAO Hongfu; 1. Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China 2. Research Institute, Jiangyin Xingcheng Special Steel Works Co., Ltd., Jiangyin 214429, China 3. NCS Testing Technology Co., Ltd., Beijing 100081, China

Keywords:: gear steel; quality stability; component; hardenability; banded structure

摘要:: 齿轮作为变速箱核心零件，需要具备高质量性能稳定性，以避免因个别齿轮提前失效导致整个变速箱损坏。而质量稳定性齿轮的制造，关键是要有高质量稳定性齿轮钢材料的供应。以上百炉次Mn-Cr系汽车齿轮钢为研究对象，通过对其冶炼成分、成品材C波动、淬透性、带状组织等进行统计和分析，研究了国内Mn-Cr系汽车齿轮钢质量稳定性控制水平和技术。结果显示，通过工艺技术参数优化，国内Mn-Cr系汽车齿轮钢可以实现冶炼终点C偏差稳定≤±0.01%，Mn，Cr偏差稳定≤±0.05%，成品材截面C波动≤0.02%的比例达95%以上，而淬透性带宽稳定≤4HRC、带状组织稳定≤2.0级。通过大批量生产和实践，国内Mn-Cr系汽车齿轮钢能在达到高性能的同时，还具备高的质量稳定性，这有益于加速推进我国高等级变速器的开发和应用。

Abstract:: As the core part of gearbox, the performance of all gears in gearbox should be stable and consistent to avoid damage to the entire gearbox due to premature failure of individual gears. The key to the manufacturing of quality stability gears is the supply of high-quality stability gear steel materials. In this paper, the Mn-Cr automotive gear steels more than 100 heats are taken as the research object. Through the statistics and analysis of the smelting composition, C fluctuation of rolled bar, hardenability and banded structure, the research on the advanced quality stability control level and technology of domestic Mn-Cr automotive gear steel is completed. The results show that through the optimization of process parameters, the C deviation of smelting end is stably controlled ≤±0.01%, the Mn and Cr deviation are stably controlled ≤±0.05% and the proportion of C fluctuation ≤0.02% of rolled bar cross section is controlled over 95% for Mn-Cr automotive gear steel. Also, the hardenability bandwidth can be controlled ≤4HRC and the banded structure can be controlled ≤2.0 stably. According to the mass production and practice, domestic Mn-Cr gear steel has achieved high performance and high-quality stability, which will be beneficial to accelerating the development and application of advanced transmissions in China.