热轧钢板桩SY390BZ的低温冲击韧性  

Low Temperature Impact Toughness of Hot Rolled Steel Sheet Pile SY390BZ

作　　者：任安超[1,2] 桂美文[2] 周桂峰[1,2] 袁泽喜[1] 吉玉[2] 朱敏[2] 周剑华[2] 

机构地区：[1]武汉科技大学材料与冶金学院,武汉430081 [2]武汉钢铁(集团)公司研究院,武汉430080

出　　处：《特殊钢》2011年第1期55-57,共3页Special Steel

基　　金：武汉市科技计划项目资助(20061002085)

摘　　要：试验用热轧钢板桩SY390BZ材料(%:0.23C、0.44Si、0.91Mn、0.06V、0.010P、0.002S)用55 kg真空感应炉冶炼并铸成Φ170 mm圆锭,轧成12 mm板,平轧最后一道次的压下量为20%,终轧温度880～900℃,空冷。测定了该钢的韧脆性转变温度,采用Quanta 400型扫描电镜和Olympus GX71型光学显微镜观察20～-60℃低温冲击断口和组织形貌。结果表明,室温时断口为大而多的等轴韧窝,具有较高的韧性(130 J);-40℃时,断口形貌韧窝比较小,而且非常浅,其韧性降低至30 J;用能量法计算得出其脆性转变温度为-30℃;钢中出现了带状组织以及Al_2O_3夹杂导致冲击韧性较低。Material for test of hot rolled steel sheet pile SY390BZ（%：0.23C,0.44Si,0.91 Mn,0.06V,0.010P 0.002S） is melted by a 55 kg vacuum induction furnace,cast toΦ170 mm round ingot,rolled to 12 mm sheet with 20% reduction in last flat pass and finishing rolling at 880～900℃,air cooling.The tough-brittle transition temperature of test steel is measured and the morphology of low temperature impact fracture and structure of steel at 20℃to - 60℃is observed by using scanning electro-microscope Quanta 400 and optical microscope Olympus GX71.Results show that there are a lot of large equiaxial dimples in fracture at ambient temperature and the steel has higher impact energy（130 J）,while there are smaller shallow dimples in fracture at -40℃and the impact energy of steel decreases to 30 J.The tough-brittle transition temperature of the steel calculated by using energy calculation method is - 30℃.The banded structure with Al_2O_3 inclusion occurs in steel led to lower impact toughness.

关 键 词：热轧钢板桩SY390BZ 低温冲击韧性 带状组织 

分 类 号：TG335.11[金属学及工艺—金属压力加工]