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 (2): 41-44.

• 工艺技术 • 上一篇    下一篇

Q345钢250 mm x 2 000 mm板坯连铸凝固规律及工艺优化

成日金1，王志衡2，王洪富2，夏金魁2，曹龙琼2，张华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武汉钢铁集团鄂城钢铁有限责任公司炼钢厂，鄂州 436002 ；
  • 收稿日期:2012-10-22 出版日期:2013-04-01 发布日期:2022-10-08
  • 作者简介:成日金(1983-)，男，博士研究生，助理工程师,2007年武汉科技大学毕业。

Solidification Rule for Casting 250 mm x 2 000 mm Slab of Steel Q345 and Process Optimization

Cheng Rijin1，Wang Zhiheng2，Wang Hongfu2， Xia Jinkui2， Cao Longqiong2， Zhang Hua1   

  1. 1 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan Science and Technology University, Wuhan 430081 ；
    2 Steelmaking Plant,Echeng Iron & Steel Co Ltd, Wuhan Iron & Steel Group, Ezhou 436002 ；
  • Received:2012-10-22 Published:2013-04-01 Online:2022-10-08

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摘要： 针对Q345钢(/%:0.14～0.18C、0.20～0.50Si、1.30～1.50Mn、≤0.025P、≤0.025S、0.015～0.060Al)250 mm×2 000 mm板坯中心偏析质量问题,建立凝固传热数学模型,并经射钉试验验证及修正,研究二冷强度(弱冷、中冷、强冷)、连铸速度(0.80～1.10 m/s)对铸坯温度场和坯壳厚度的影响,同时优化轻压下工艺和相应的连铸参数。结果表明,在典型拉速0.95 m/min及弱冷制度下,板坯凝固末端23.43 m,两相区长度7.22 m;减弱冷却强度,凝固末端后移0.56～0.67 m,两相区长度变长0.25～0.29 m;拉速增大0.15 m/min,凝固末端后移3.45～3.90 m,两相区长度变长0.94～1.22 m;优化采用弱冷冷却制度,拉速为0.95 m/min,轻压下位置对应固相率fs=0.4～0.9,总压下量达6 mm时,Q345钢板坯中心偏析Ⅰ级内平均合格率由83.1%提高到98.0%。

关键词: Q345钢, 250 mm x 2 000 mm板坯, 连铸, 数学模型, 凝固末端, 中心偏析

Abstract: In according with issue of central segregation of 250 mm x 2 000 mm slab of steel Q345 (/% : 0.14-0.18C, 0.20-0.50Si, 1.30-1.50Mn, ≤ 0.025P, ≤ 0.025S, 0.015-0.060A), a solidification heat transfer mathematical model is established, and verified and modified by nail shooting test to study the effect of secondary cooling intensity (light, middle and strong) and casting speed (0.80-1.10 m/min) on casting slab temperature field and shell thickness, and optimize the soft reduction process and correspondent casting parameters. Results show that with typical casting speed 0. 95 m/min and light cooling scheduling, the final solidification point of slab is 23.43 m, the length of mushy (liquid-solidified phase) zone is 7.22 m； with decreasing the secondary cooling intensity, the final solidifying point extends 0.56-0.67 m and the length of mushy zone increases by 0.25-0.29 m； with increasing casting speed by 0.15 m/min, the final. solidifying point extends 3. 45 ~3. 90 m while the length of mushy zone increases by 0.94-1.22 m； with optimized light cooling schedule, casting speed 0. 95 m/min, solidified fraction, 0.4-0.9 at soft reduction zone, and total reduction amount 6mm, the qualified percentage for ≤ I ratting central segregation of slab of steel Q345 increases to 98.0% from original 83.1%.

Key words: Steel Q345, 250 mm x 2 000 mm Slab, Casting, Mathematical Model, Final Solidifying Point, Central Segregation

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