摘要
试验钢SCM435（／％：0．33—0．38C，0．15—0．35Si，0．60～0．85Mn，≤0．025P，≤0．025S，0．90～1．20Cr，0．15～0．30Mo）盘条的生产流程为80tBOF—LF-280mm×325mm铸坯-160mm×160mm热轧坯-热连轧成qbl6mm盘条。试验研究了160mm×160mm热轧坯由常规轧制工艺（开轧1060℃，精轧930～950℃，吐丝860～900℃，冷却速度0．5～0．6℃／s）和控轧控冷工艺（开轧1060℃，精轧820～850℃，吐丝780～820℃，冷却速度0．4～0．5℃／s）对SCM435钢热轧盘条组织和力学性能的影响。结果表明，随着精轧温度的降低和冷却速度的减小，钢热轧盘条的组织得到改善，抗拉强度明显降低；常规工艺轧制SCM435钢热轧盘条的抗拉强度平均952MPa，组织为铁素体＋珠光体＋贝氏体＋马氏体，控轧控冷工艺轧制的SCM435钢热轧盘条的抗拉强度平均817MPa，组织为均匀的铁素体＋珠光体。结合控轧控冷工艺原理对钢的组织和性能变化进行了分析。
The production flowsheet of test steel SCM435 rod coil （/% ： 0. 33 -0. 38C, 0. 15 - 0. 35Si, 0. 60 0. 85Mn, ≤0. 025P, ≤0. 025S, 0. 90 - 1.20Cr, 0. 15 -0. 30Mo） is 80 t BOF-LF-280 mm ×325 mm casting bloom-160 mmx 160 mm hot-rolled billet-hot continuous rolling to q516 mm rod coil. The effect of 160 mmx 160 mm hot-rolled billet rolling to rod coil processes by normal rolling （beginning rolling at 1 060 ℃, finishing rolling at 930 - 950 ℃, finishing exit temperature 860 -900 ℃, cooling rate 0. 5 -0. 6 ℃/s） and eontrol-rolling-eooling （beginning rolling at 1 060 ℃, finishing rolling at 820 - 850 ℃, finishing exit temperature 780 - 820 ℃, cooling rate 0. 4 - 0. 5 ℃/s） on structure and mechanical properties of steel SCM435 hot-rolled rod coil has been tested and studied. Results show that with decreasing the finishing temperature and cooling rate, the structure of steel hot-rolled rod coil is improved and the tensile strength of steel decreases obviously, that is the average tensile strength of steel SCM435 hot-rolled rod coil rolled by normal rolling process is 952 MPa with structure of ferrite ＋ pearlite ＋ bainite ＋ martensite, while the average tensile strength of SCM435 hot-rolled rod coil roiled by control rolling-cooling process is 817 MPa with structure of ferrite ＋ pearlite. Based on the principle of control-rolling-cooling the analysis on change of structure and properties of steel has been carried out.
出处
《特殊钢》
北大核心
2016年第5期45-47,共3页
Special Steel
关键词
SCM435钢
Ф16
mm盘条
控轧控冷
组织
力学性能
Steel SCM435, Ф16 mm Rod Coil, Control-Rolling-Cooling, Structure, Mechanical Properties
