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 ›› 2012, Vol. 33 ›› Issue (5): 29-31.

• 工艺技术 • 上一篇    下一篇

液化天然气罐用9%Ni钢板坯连铸工艺优化

李建民1，陈远清2， 刘东风1， 仇圣桃2， 吴夜明2   

  1. 1太原不锈钢股份有限公司技术中心，太原O3OOO3；
    2钢铁研究总院连铸技术国家工程研究中心，北京100081
  • 收稿日期:2012-03-05 出版日期:2012-10-01 发布日期:2022-10-09
  • 作者简介:李建民(1964-),男，硕士，高级工程师，钢铁生产工艺及品种的研发。

Optimization of Slab Concasting Process of 9 % Ni Steel for Liquefied Natural Gas Tank

Li Jianmin1, Chen Yuanqing2, Liu Dongfeng1 , Qiu Shengtao2 ，Wu Yeming2   

  1. 1 Technical Center, Taiyuan Stainless Steel Co Ltd, Taiyuan 030003 ；
    2 National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081
  • Received:2012-03-05 Published:2012-10-01 Online:2022-10-09

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摘要： 分析了9%Ni钢(/%:≤0.10C、≤0.35Si、0.30～0.80Mn、≤0.005S、≤0.008P、8.5～10.0Ni、≤0.10Mo、≤0.10Al)200～220 mm板坯连铸试生产中出现的结晶器液面结壳、铸坯表面网裂纹产生原因,对连铸工艺进行优化。结果表明,液相线温度偏差是导致9%Ni钢液面结壳的主要原因,基于差示扫描量热法(DSC)的实测数据建立了新的液相线温度计算公式,得出试验的9%Ni钢的液相线温度,在钢水过热度为10～30℃时能较好地满足板坯的连铸要求。通过控制[N]≤25×10-6,[Al]≤0.03%,二冷比水量由0.6L/kg降至0.4L/kg,使9%Ni钢连铸顺行,铸坯内部和表面质量良好。

关键词: 9%Ni钢, 板坯, 连铸, 液面结壳, 网状裂纹, 工艺优化

Abstract: The formation causes of occurred shell at meniscus in mold and network crack of slab surface in pilot con- casting production of 200 - 220 mm slab of 9% Ni steel (/% : ≤0. 10C, ≤0. 35Si, 0. 30 〜0. 80Mn, ≤0. 005S, ≤0. 008P, 8. 5 ~ 10. ONi,≤0. 1OMo, ≤0. 10A1) are analyzed, and the optimization on concasting process has been carried out. Results show that the calculated deviation of liquidus temperature of 9% Ni steel is the main cause led to the shell occurred at meniscus and based on experimental data by differential scanning calorimetry (DSC), a new liquidus temperature calculation formula is established to get the liquidus temperature of tested 9% Ni steel, and as the overheat extent of liquid is 10 ~30 ℃, it is available to meet the requirement of slab concasting. With controlling [N] ≤25 x 10-6, [ Al] ≤0. 03% and decreasing secondary cooling water rate from 0. 6 L/kg to 0. 4 L/kg the concasting of 9% Ni steel is going on smoothly, the inner and surface quality of slab is nice.

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