表层超细晶粒普碳钢中厚板的工业试制  

Trial Production of Plain Low Carbon Steel Plates With Ultrafine Grained Ferrite in Surface Layers

作　　者：范建文[1] 谢瑞萍[1] 张维旭[1] 王彦锋[1] 阎智平[2] 

机构地区：[1]首钢集团总公司技术研究院,北京100041 [2]首钢中厚板轧钢厂,北京100041

出　　处：《钢铁》2006年第4期40-46,55,共8页Iron and Steel

基　　金：北京市科技新星计划资助项目(H013610320111)

摘　　要：以充分挖掘材料潜力提高中厚板质量为目标,开展了普碳钢中厚板表层组织超细化轧制工艺研究.单向压缩热模拟试验结果表明,在适当条件下,化学成分为ω（C）0.16%、ω（Si）0.19%、ω（Mn）0.56%的普碳钢,可发生形变诱导奥氏体-铁素体相变并获得超细晶粒铁素体.实验室轧制9 mm钢板的铁素体晶粒度达到11级（约7μm）,与热模拟试验的结果相一致,屈服强度达到350 MPa.在首钢3 500 mm轧机上,采用化学成分为ω（C）0.13%～0.16%、ω（Si）0.20%～0.25%、ω（Mn）0.5%～0.7%、ω（P）0.01%～0.02%、ω（S）0.005%～0.010%的连铸坯进行工业试制.28 mm厚钢板的表层铁素体晶粒度达到12级,屈服强度达到310～321 MPa,抗拉强度达到440～450 MPa,同时保持34%左右的伸长率.The rolling process was studied to produce the plain low carbon steel plates with ultra fine grained ferrite in surface layers. The results of hot simulation tests by the compression of cylindrical specimens show that for plain low carbon steel （ω（C） 0.16%, w（Si） 0.19%, w（Mn） 0.56%）, under the suitable conditions, the strain induced ferrite transformation occurs and the ultra-fine ferrite can be obtained. Then, the test in the laboratory shows that the ferrite grains of the 9 mm thick, air cooled plate can be refined to about 7 μm （ASTM E112 No. 11）, which is similar to that of hot-simulation specimens, and that the yield strength of the plates is up to 350 MPa. Finally, trialproduction was carried out with continuously casting slabs with 0.13%-0. 16% C, 0.20%-0. 25% Si, 0. 5%-0.7% Mn, 0. 01%-0. 02% P, 0. 005%-0.01% S in wt% on 3500 mm mill of Shougang in China. The plain carbon steel plates of 28 mm in thickness are characterized by ultra-fine grained ferrite of 5 μm （ASTM Ell2 No. 12） in the sur face layers. The yield strength is in the range of 310-321 MPa,and the tensile strength is in the range of 440-450 MPa with 34% elongation.

关 键 词：普碳钢中厚板 铁素体晶粒超细化 工业试制 

分 类 号：TG335.5[金属学及工艺—金属压力加工]