免酸洗汽车大梁用S510L热轧黑皮带钢的研发.pdfVIP

免酸洗汽车大梁用 S510L 热轧黑皮带钢的研发1 1 1 1 2 2 孟宪堂 于 洋 徐海卫 李瑞恒 赵 林 （1. 首钢技术研究院，北京 100043 ；2. 首钢迁安钢铁有限责任公司，迁安 064404 ） 摘 要 通过对热轧带钢的氧化层形成机制及氧化层转变CCT曲线的研究，确定了首钢汽车大梁用免酸洗热轧黑皮 带钢的成分及热轧工艺制度。采用金相组织观察、背散射SEM分析、XRD分析、力学性能测试等方法，分析了带钢 的力学性能、氧化层形貌和精细结构、物相组成。结果表明，首钢S510L热轧黑皮带钢氧化层与基体结合良好，厚 度小于10μm ；氧化层Fe3O4 比例达到75%-85%，与FeO 比例合理，可以实现免酸洗冲压的要求。 关键词 免酸洗 热轧 黑皮钢 氧化铁皮 Development of Hot-rolled No-pickling Black Surface S510L Beam Steel for Automobiles Meng Xiantang1 Yu Yang1 Xu Haiwei1 Li Ruiheng2 Zhao Lin2 (1. Shougang Research Institute of Technology, Beijing, 100043; 2. Shougang Qian’an Steel Company, Qian’an, 064404) Abstract The paper studied the forming principle of the oxide layer on the hot rolled strip and the CCT curve of the strip scale. On the basis of these studies, the composition and the hot rolling processes of the hot-rolled no-pickling black surface S510L beam steel for automobiles were determined. The mechanical properties of the strip and the characteristic of the scale were examined in detail with X-ray diffraction, back scattering SEM,etc. The results show the scale has an excellent adhesion with the matrix, and the thickness of the oxide layer is less than 10μm. In addition, the proportion of Fe O is about 3 4 75%～85%, which is of an appropriate ratio with FeO. The trial steel can meet the requirement of no-pickling stamp. Key words no-pickling, hot-rolled, black surface strip, scale 1 引言 随着我国国民经济的迅猛发展，我国钢铁工业在设备条件方面已达到国际先进水平。同时，国内众多大 型钢企也开展了大量针对产品外形、力学性能和使用寿命的攻关研究，使多数钢材产品的尺寸精度和性能质 量有的长足的进步[1] 。但是，随着热轧带钢更多采用热装和短时加热等节能技术，带钢表面的氧化铁皮的去 除更加困难，由此引发的表面质量问题