1000MPa级高强汽车钢热轧原料卷性能均匀性的分析  

Analysis on property uniformity of hot-rolled coil of 1000MPa grade high strength automobile steel

作　　者：韩赟 阳锋 邱木生 邹英 韩龙帅 张士杰 HAN Yun;YANG Feng;QIU Mu-sheng;ZOU Ying;HAN Long-shuai;ZHANG Shi-jie(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]首钢京唐钢铁联合有限责任公司,河北唐山063200

出　　处：《中国冶金》2021年第12期89-95,共7页China Metallurgy

基　　金：河北省重点研发计划资助项目(20311004D)。

摘　　要：为研究和改善某牌号1 000 MPa级高强汽车钢热轧原料卷的性能均匀性,前后进行了4次工业试验。结果表明,卷取温度为620℃时,钢卷不同位置组织差异巨大,且性能波动显著。在带尾10 m处,边部组织由细小的铁素体和马氏体组成,而中部由粗大的铁素体和珠光体组成;在带尾100 m处,边部由细小的铁素体、回火马氏体和少量新鲜马氏体组成,而中部仍然由粗大的铁素体和珠光体组成。巨大的组织差异导致通卷抗拉强度的波动值高达552 MPa。入缓冷坑对钢卷的组织和性能均匀性无明显影响,但对提高卷取温度有明显改善。卷取温度提高至680℃后,不同位置处的边部和中部组织差异减轻,通卷抗拉强度的波动值降低至146 MPa。高卷取温度和边部遮挡工艺同时采用后,钢卷的性能均匀性得到进一步提高,通卷抗拉强度的波动值进一步降低至108 MPa。Four industrial tests were carried out to study and improve the property uniformity of hot-rolled coil for a 1 000 MPa grade high strength automobile steel.When the coiling temperature was 620 ℃,the microstructures at different positions of coil varied greatly,and the properties fluctuated significantly.At 10 m from the coil tail,the edge was composed by fine ferrite and martensite,while the middle part was composed by coarse ferrite and pearlite.At 100 m from the coil tail,the edge was composed by fine ferrite,tempered martensite and a small amount of fresh martensite,while the middle part was still composed by coarse ferrite and pearlite.The great difference of microstructure led to the remarkable fluctuation of tensile strength up to 552 MPa.The effect of entering slow cooling pit on microstructure and property uniformity of steel coil was not obvious,but the opposite was true for increasing the coiling temperature.When the coiling temperature was increased to 680 ℃,the organization difference of edge and middle part decreased,and the fluctuation value of tensile strength for entire coil decreased to 146 MPa.After applying the combination of high coiling temperature and edge-masking technology,the fluctuation value of tensile strength was further reduced to 108 MPa,and the uniform performance of coil was further improved.

关 键 词：高强钢 热轧 性能均匀性 层流冷却 卷取温度 

分 类 号：U465.11[一般工业技术—材料科学与工程] TG335.11[机械工程—车辆工程]