FTSR产线快冷模式下薄规格高强钢扁卷原因分析及控制  

Cause analysis and control of high strength and thin gauge strip coil oval deformation under fast cooling condition of FTSR line

作　　者：张星[1] 栗建辉[1] 侯明山[1] 邢天庆 ZHANG Xing;LI Jianhui;HOU Mingshan;XING Tianqing(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063016,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063016

出　　处：《轧钢》2021年第1期31-35,共5页Steel Rolling

摘　　要：配置短距离、快速冷却层流系统的FTSR生产线具备较好的控轧控冷条件,可充分利用细晶强化生产高强度低合金热轧带钢,但薄规格钢卷普遍出现扁卷缺陷,影响后续加工。为探究扁卷机理,计算了试验钢的连续冷却转变曲线,并通过热模拟试验,研究了试验带钢轧后冷却的相变行为。结果表明,短距离快冷模式下热轧带钢在层冷线上相变孕育期缩短,相变提前结束,轧后高温奥氏体相变并非是钢卷扁卷的原因,其真正原因是卷取机设备能力的限制。为此,进行了钢卷延迟卸卷和减小卷重试验,结果表明热轧批量生产的较薄规格钢卷应延迟100s卸卷,并控制钢卷目标卷重在18t以内,能够有效解决薄规格高强钢卷扁卷问题。TMCP process for high strength low alloy steel strip is well applied on FTSR line based on short distance and fast cooling laminar cooling line,which can be effectively used grain refining strengthening,but the coil oval deformation generally appears during the thin gauge strip production,which affect subsequent processing.In order to find out the causes of coil oval deformation,CCT curve of tested steel was calculated and phase transformation behaviors after finishing rolling and continuously cooling were also simulated.The result shows that due to fast cooling,phase transformation will finish earlier before coiling,and will not affect coil shape.Therefore,the main cause of coil oval deformation is the coiler capacity limitation.The production practice of delaying coil stripping and reducing weight of coils indicates that when delaying 100safter coiling as well as controlling max 18t coil weight could effectively improve coil oval deformation of the thin gauge strip.

关 键 词：FTSR产线 高强钢 扁卷 快冷 相变 延迟卸卷 减小卷重 

分 类 号：TG335[金属学及工艺—金属压力加工]