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结合宝钢生产工艺设备通过特殊的化学成分设计和热轧工艺制度成功开发出80 kg高扩孔钢产品。该材料不仅拉伸力学性能及扩孔率较好,满足汽车成型要求,而且在-40℃依然保持较好的冲击韧性,较好地满足了零部件的服役要求。通过组织分析发现,这与扩孔实验开裂与13.5 mm和25 mm的TiN颗粒在翻边过程形成的空隙相关。同时在材料中发现50~500 nm及小于50 nm的(Nb、Ti)C复合强化析出物是提高材料强度的主要原因。目前该材料已成功应用于汽车控制臂等零件,成为汽车应用的新材料。
In combination with Baosteel’s production process equipment, 80kg high reamed steel products have been successfully developed through special chemical composition design and hot rolling process system. The material not only tensile mechanical properties and hole expansion rate is better to meet the requirements of automotive molding, but also maintain good impact toughness at -40 ℃, better meet the service requirements of parts and components. Through tissue analysis, it was found that this was related to the cracking of the reaming test and to the voids formed by flanging during the 13.5 mm and 25 mm TiN particles. At the same time, it is found that (Nb, Ti) C composite strengthening precipitates of 50-500 nm and less than 50 nm in the material are the main reasons for increasing the material strength. At present, the material has been successfully used in automotive control arm and other parts, a new material for automotive applications.