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

张大江; 王翠娜; 向华; 万国喜; 郑飞

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

更新时间：2026-01-21

- Cause for Submerged Entry Nozzle Blocking during Casting of Aluminium Killed Steel SPHC and Control Process
- Special Steel Vol. 36, Issue 3, Pages: 30-33(2015)
- 作者机构：
  
  安阳钢铁集团公司技术中心,安阳,455004
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：22 December 2014，
  
  Online First：17 August 2022，
  
  Published：17 August 2015
- 稿件说明：
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张大江, 王翠娜, 向华, et al. Cause for Submerged Entry Nozzle Blocking during Casting of Aluminium Killed Steel SPHC and Control Process[J]. Special Steel, 2015, 36(3): 30-33.
DOI：

张大江, 王翠娜, 向华, et al. Cause for Submerged Entry Nozzle Blocking during Casting of Aluminium Killed Steel SPHC and Control Process[J]. Special Steel, 2015, 36(3): 30-33. DOI：

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Al

和高熔点（1750℃）CaO·2Al

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。

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 Al

and high melting point (1 750 ℃ ) CaO·2Al

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 c

alcium-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.

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