微铌510MPa级热轧汽车板的成分与轧制工艺研究.pdfVIP

微铌 510MPa 级热轧汽车板的成分与轧制工艺研究 罗石念 孔祥胜 邹 阳 （宁波钢铁有限公司制造管理部，宁波 315807 ） 摘 要 本文采用低锰、微铌合金化及优化碳含量与终轧温度、低温卷取工艺，控制热轧带钢带状组织与珠光体组 织，并通过生产实践，根据宁钢公司装备条件，在全国产化的 1780 机组上成功开发出一种微铌 510MPa 级热轧汽 车板，铌含量比现有 510MPa 级热轧板约降低 2/3，强塑积达到 17GPa%以上；用户厂家的实际应用结果表明，其 强度与塑、韧性等综合力学性能优异，使用良好。 关键词 铌合金化 高强度 强塑积 大梁 汽车板 Study on Composition and Processing Parameters of Micro-Nb Alloyed Automobile Beam Steel 510L Luo Shinian Kong Xiangsheng Zou Yang (Making and Managing Department of Ningbo Iron Steel Co., Ltd., Ningbo, 315807) Abstract In this thesis, by adopting low Manganese, micro-Nb alloyed, optimized carbon finish rolling temperature and low-temperature-coiled process, low ribbon and low percentage pearlite of hot bands were obtained in practical mass production. In the condition of localization 1780mm hot rolling mill of Ningbo iron steel Company, a kind of micro-Nb alloyed automobile beam steel 510L were developed. The niobium content of micro-Nb alloyed steel 510L with strength elongation product above 17GPa% was reduced by 2/3 as compared with previous 510L auto sheets. The practical application of the micro-Nb alloyed steel 510L sheet are also introduced, which are popular with users due to the excellent plasticity and strength properties. 1 Key words Nb alloyed, higher strength, the product of strength and elongation, beam, auto sheet 根据国际汽车工业的发展趋势，随着各国现代化建设进程的加快及高速公路飞速发展，各类载重车、大 型客货车的更新及减重节能的需求也迫在眉睫[1]，对大梁钢板的强度要求也越来越高。国内汽车大梁钢的主 要强度级别为 510MPa，此外还有440MPa 、590MPa、610MPa 几个品种也在不同车型上使用。 近年来，国内某大型汽车部件制造公司提出宁钢供货的 510L 大梁板在满足抗拉强度指标前提下，延伸 率值不低于 30%，这意味着其强塑积（抗拉强度×延伸率值）至少要达到 15.3GPa%，而这一点在现有的大 梁板研究文献中尚未见提及。为满足用户汽车用材高强塑积的实物性能要求，宁钢结合自身的冶炼、轧钢设 备实际状况，研究试制微铌 510MPa 级汽车大梁板，通过优化设