冷却模式对SPHC冷轧基板加工硬化的影响  

Effect of cooling mode on work hardening of SPHC cold rolled substrate

作　　者：刘冠华 贾军艳[1] 马春红[1] 许可 龙标 王浩 LIU Guanhua;JIA Junyan;MA Chunhong;XU Ke;LONG Biao;WANG Hao(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》2023年第5期120-123,128,共5页Steel Rolling

摘　　要：为减少SPHC热轧钢卷在冷轧压下率为90%时因加工硬化现象造成的成品厚度波动超差问题,结合某热轧产线层冷段布局情况,提出在终轧温度和卷取温度不变的情况下,热轧冷却段采取以稀疏冷却模式代替集中冷却的方式,对比分析了两种冷却模式下热卷的组织性能及冷轧成品厚度超差降判率。结果表明:在卷取温度为680℃时,稀疏冷却模式下SPHC热卷抗拉强度较集中冷却模式降低5 MPa,屈服强度降低35 MPa,两种冷却模式下SPHC带钢晶粒度均为8.5级,稀疏冷却有助于降低SPHC热轧钢卷的加工硬化;冷轧成品厚度超差降判率由集中冷却模式下的0.41%降至稀疏冷却模式下的0.21%,相比于集中冷却模式,采用稀疏冷却模式后SPHC热卷的厚度超差问题明显改善,达到了客户预期。In order to reduce the oversize thickness fluctuation of finished products caused by work hardening phenomenon when the cold rolling reduction rate of SPHC hot rolled coil is 90%,combined with the layout of the laminar cooling section of a hot rolling production line,it is proposed to adopt a sparse cooling mode instead of centralized cooling in the hot rolling cooling section,while the final rolling temperature and coiling temperature remain unchanged.The microstructure and properties of the hot coil and the reduction rate of oversize thickness of cold rolled product under two cooling modes were compared and analyzed.The results show that when the coiling temperature is 680℃,the tensile strength and yield strength of SPHC hot rolled coils under sparse cooling mode decrease by 5 MPa and 35 MPa compared with those under central cooling mode.The grain size of SPHC steel under both cooling modes is 8.5,and sparse cooling is helpful to reduce the work hardening of SPHC hot rolled coils.The reduction rate of oversize thickness of cold rolled finished products decreased from 0.41%under the centralized cooling mode to 0.21%under the sparse cooling mode.Compared with the centralized cooling mode,the oversize thickness problem of SPHC hot coil was significantly improved after using the sparse cooling mode,which reached the customer's expectation.

关 键 词：SPHC热轧钢卷 加工硬化 集中冷却 稀疏冷却 厚度超差 组织性能 

分 类 号：TG335.12[金属学及工艺—金属压力加工]