ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2011, Vol. 32 ›› Issue (1): 55-57.

• 组织和性能 • 上一篇    下一篇

温热轧钢板桩SY390BZ的低冲击韧性

任安超1,2, 杜美文2,周桂峰1,2,袁泽喜1,吉玉2,朱敏2,周剑华2   

  1. 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
  • 收稿日期:2010-06-21 出版日期:2011-02-01 发布日期:2022-09-28
  • 作者简介:任安超(1976-),男,工程师,博士生,高性能型钢研究。

Low Temperature Impact Toughness of Hot Rolled Steel Sheet Pile SY390BZ

Ren Anchao1,2, Gui Meiwen2,Zhou Guifeng1,2, Yuan Zexi1, Ji Yu2,Zhu Min2, Zhou Jianhua2   

  1. 1 School of Material Science and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081 ;
    2 Research and Development Institute, Wuhan Iron and Steel (Group) Corp, Wuhan 430080)
  • Received:2010-06-21 Published:2011-02-01 Online:2022-09-28
  • Supported by:
    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Al2O3夹杂导致冲击韧性较低。

关键词: 热轧钢板桩SY390BZ, 低温冲击韧性, 带状组织

Abstract: Material for test of hot rolled steel sheet pile SY390BZ (% : 0. 23C, 0.44Si, 0.91Mn, 0.06V, 0.010P 0. 002S) is melted by a 55 kg vacuum induction furnace, cast to Φ170 mm round ingot, rolled to 12 mm sheet with 20% reduction in last flat pass and finishing rolling at 880 〜900 °C, 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 °C to - 60 °C 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 °C 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 °C。 The banded structure with A12O3 inclusion occurs in steel led to lower impact toughness.