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 ›› 2015, Vol. 36 ›› Issue (3): 30-33.

• 工艺技术 • 上一篇    下一篇

铝镇静钢SPHC浸入式水口结瘤成因和控制工艺

张大江,王翠娜,向华,万国喜,郑飞   

  1. 安阳钢铁集团公司技术中心,安阳455004
  • 收稿日期:2014-12-22 出版日期:2015-06-01 发布日期:2022-08-17
  • 作者简介:张大江( 1983-),男,硕士 (2009年重庆大学),工程师, 2007年河南科技大学(本科)毕业,炼钢、连铸工艺研究。

Cause for Submerged Entry Nozzle Blocking during Casting of Aluminium Killed Steel SPHC and Control Process

Zhang Dajiang, Wang Cuina, Xiang Hua, Wan Guoxi , Zheng Fei   

  1. Technology Center, Anyang Iron and Steel Group Co Ltd, Anyang 455004
  • Received:2014-12-22 Published:2015-06-01 Online:2022-08-17

摘要: SPHC钢(/%:≤0.08C,≤0.05Si,0.10~0.30Mn,≤0.025P,≤0.025S,0.020~0.045Al)的工艺流程为铁水预处理-150 t顶底复吹转炉-LF-双流板坯连铸-1780 mm热连轧工艺。通过水口结瘤物分析得出,水口结瘤物主要成分为Al2O3和高熔点(1750℃)CaO·2Al2O3夹杂,结瘤物外层为结构疏松的堆积状氧化铝层,中间层为网状氧化铝层,内层为水口材料的脱碳层。通过控制转炉终点[C]>0.04%,调整喂钙铁线用量,使钢液中平均钙铝比由0.03提高至0.06,精炼时软吹氩搅拌由6~8 min提高到8~10 min,连铸过程防止钢液二次氧化等工艺措施,48炉SPHC钢生产结果表明,避免了水口结瘤事故的发生。

关键词: SPHC钢, 浸入式水口结瘤, Al2O3夹杂物, 钙处理, 工艺改善

Abstract: The flowsheet for steel SPHC (/% : ≤0.08C, ≤0. 05Si, 0. 10 ~0. 30Mn, ≤0, 025P, ≤0.025S, 0. 020 ~0. 045Al) is hot metal pretreatment- 150 t top and bottom combined blown converter- LF- double strand slab casting process- 1 780 mm hot continuous rolling process. By analysis on nozzle blocking substance it is obtained that the main ingredient of blocking substance is Al2O3 and high melting point (1 750 ℃ ) CaO·2Al2O3 inclusion, the outlet of blocking substance is piled up alumina with loose structure, the middle layer is net type alumina and the inner layer is decarburized zone of nozzle materials. With the process measures including controlling converter end [C] > 0. 04% , adjusting feeding calcium wire amount to increase the liquid average calcium-aluminium ratio from 0. 03 to 0. 06, increasing soft argon blowing time from 6 ~ 8 min to 8 ~ 10 min and preventing liquid secondary oxidizing in casting process, the results of 48 heats steel SPHC production show that the nozzle blocking accidents are averted.