【摘要】 针对当前生产的SWRH82B盘条通条性能不佳、存在较高级别网状渗碳体和马氏体等异常组织以及索氏体化率低且不均匀等问题，本文基于某钢厂高速线材生产线，利用DEFORM-3D软件对SWRH82B盘条轧制全过程温度场进行了有限元模拟计算，分析了轧制过程中轧件的塑性变形对其表面和芯部热交换的影响。同时，研究了水冷工艺的优化。结果表明：在粗轧阶段，轧件表面的温度呈现逐渐下降的趋势，芯部温度下降缓慢；中轧阶段轧件表面温度呈现上升趋势，同时芯部温度下降较明显。轧件在预精轧阶段截面积逐渐减小，整个截面由于塑性变形生热而升温，使轧件表面和芯部温度均升高。在精轧和减定径阶段轧制时，轧制速度较快，轧件表面和芯部温度在短暂提升后经过水冷快速降低，随后经过芯部返温使表面温度升高。当1号～4号水冷箱和5号水冷箱对应的对流换热系数为400 W/(m~2·℃)和300 W/(m~2·℃)时，盘条在吐丝时的表面平均温度约为919℃,芯部温度约为939℃。经优化水冷工艺后，轧件断面温度均匀，模拟温度与实测温基本吻合，误差在±10℃以内；同时，盘条芯部马氏体组织显著减少，盘条抗拉强度相比水冷参数优化前提升约40 MPa,断面收缩率提升约8%。更多还原

【Abstract】 Aiming at the problems in the current production of SWRH82B wire rods, including poor overall performance along the entire length, abnormal structures(such as high-level network cementite and martensite), low and uneven sorbitization rate, this paper conducted a finite element simulation calculation of the temperature field throughout the entire rolling process of SWRH82B wire rods using DEFORM-3D software, based on a high-speed wire rod production line of a steel plant. The influence of plastic deformation of the workpiece on heat exchange between its surface and core during rolling was analyzed. Meanwhile, the optimization of water cooling processes was investigated.The results show that: In the roughing stage, the surface temperature of the workpiece shows a gradual decreasing trend, while the core temperature decreases slowly; in the intermediate rolling stage, the surface temperature rises, and the core temperature decreases more significantly. During the pre-finishing stage, the cross-sectional area of the workpiece gradually decreases, and the entire section heats up due to heat generation from plastic deformation, leading to increased temperatures in both the surface and core. In the finishing and reducing-sizing stages, with higher rolling speeds, the surface and core temperatures of the workpiece briefly increase, then rapidly decrease after water cooling, followed by a rise in surface temperature due to core reheating. When the convective heat transfer coefficients of No.1 to No.4 water cooling boxes and No.5 water cooling box are 400 W/(m~2·℃) and 300 W/(m~2·℃), respectively, the average surface temperature of the wire rod at the laying head is approximately 919 ℃, and the core temperature is about 939 ℃.After optimizing the water cooling process, the cross-sectional temperature of the workpiece becomes uniform, with the simulated temperatures basically agreeing with the measured ones(error within ±10 ℃). Meanwhile, the martensitic structure in the core of the wire rod is significantly reduced. Compared to before optimization, the tensile strength of the wire rod increases by approximately 40 MPa, and the reduction of area increases by about 8%.更多还原