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 ›› 2013, Vol. 34 ›› Issue (5): 54-56.

• 工艺技术 • 上一篇    下一篇

Q345E低合金高强度钢Φ600 mm连铸圆坯的生产实践

王社教1,2,倪红卫1,尹修刚2,陈宏豫2,成日金1   

  1. 1. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉 430081;
    2. 承德建龙特殊钢有限公司,承德 067201 ;
  • 收稿日期:2013-05-06 出版日期:2013-10-01 发布日期:2022-09-22
  • 作者简介:王社教(1966-),男,高级工程师,1989年武汉科技大学毕业

Production Practice of Φ600 mm Round Bloom of HSLA Steel Q345E

Wang Shejiao1,2 , Ni Hongwei1 , Yin Xiugang2 , Chen Hongyu2 , Cheng Rijin1   

  1. 1. Key Laboratory for Ferrous Metallurgy and Resources UtiEzation of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081 ;
    2. Chengde Jianlong Special Steel Co Ltd, Chengde 067201 ;
  • Received:2013-05-06 Published:2013-10-01 Online:2022-09-22

摘要: Q345E钢(/%:0.14~0.17C、0.20~0.30Si、1.28~1.38Mn、≤0.011P、≤0.005S、0.015~0.030Al、0.032~0.045V)大圆坯的生产流程为65 t LD-LF-VD-Φ600 mm圆坯CC工艺。通过出钢时滑板挡渣,加入预熔合成渣(/%:40~50CaO、≤9SiO2、30~40Al2O3~7MgO、8~10Al)、钢芯铝、脱氧剂和合金,控制拉速0.22 m/min,32 t中间包钢水过热度(25±5)℃,恒液面900 mm,全程保护浇铸和电磁搅拌等措施,试生产法兰用Q345E钢Φ600mm连铸圆坯。生产结果表明,铸坯表面无可见冷疤、鼓肚等缺陷,中心缩孔0.5级,中心疏松1.0级,碳偏析≤1.09,-50℃低温冲击功超过100 J,完全满足标准要求。

关键词: Q345E低合金高强度钢, 65 t LD-LF-VD-CC流程, Φ600 mm连铸圆坯, 法兰用钢, 生产实践

Abstract: The production flow sheet for heavy bloom of steel Q345E (/% : 0.14-0.17C, 0.20-0.30Si, 1.28-1.38Mn, ≤0.011P, ≤0.005S, 0.015-0.030A1, 0.032-0.045V) is 65 t LD-LF-VD-Φ600 mm round bloom CC process. With the measures including using sliding plate to stop slag in tapping , and adding pre-melted synthetic slag (/% : 40-50CaO, ≤9SiO2,30-40Al2O3, 3-7MgO, 8-10A1), steel-clad aluminium, deoxidizer and alloys, controlling casting speed 0.22 m/min, overheating extent of liquid (25 ± 5)℃ and constant liquid level 900 mm in 32 t tundish, whole process shield casting and electromagnetic stirring, the Φ600 mm casting round bloom of steel Q345E for flange is pilot-produced. The production results show that there is no visible surface defect such as scab and bulging, the rating of center line shrinkage is 0.5, the center porosity 1.0 and the carbon segregation ≤1.09, and the impact energy of steel at -50 ℃ is more than 100 J, all meet the requirement.

Key words: HSLA Steel Q345E, 65 t LD-LF-VD-CC Flow Sheet, Φ600 mm Cast Round Bioom, Steel for Flange, Production Practice