Analysis of Influence Factor on Ladle Free-Opening Rate with Acid-Resistant Pipe Line Steel and Practice of Improvement Process

李永生; 蒋海涛; 秦登平; 石锦雄; 危尚好

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Analysis of Influence Factor on Ladle Free-Opening Rate with Acid-Resistant Pipe Line Steel and Practice of Improvement Process

更新时间：2026-01-21

- Analysis of Influence Factor on Ladle Free-Opening Rate with Acid-Resistant Pipe Line Steel and Practice of Improvement Process
- Special Steel Vol. 35, Issue 6, Pages: 41-43(2014)
- 作者机构：
  
  首秦金属材料有限公司炼钢部,秦皇岛,066000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：20 June 2014，
  
  Online First：20 August 2022，
  
  Published：20 August 2014
- 稿件说明：
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李永生, 蒋海涛, 秦登平, et al. Analysis of Influence Factor on Ladle Free-Opening Rate with Acid-Resistant Pipe Line Steel and Practice of Improvement Process[J]. Special Steel, 2014, 35(6): 41-43.
DOI：

李永生, 蒋海涛, 秦登平, et al. Analysis of Influence Factor on Ladle Free-Opening Rate with Acid-Resistant Pipe Line Steel and Practice of Improvement Process[J]. Special Steel, 2014, 35(6): 41-43. DOI：

摘要

抗酸管线钢API X65（/%:≤0.045C

0.15~0.35Si

1.50~1.65Mn

≤0.008P

≤0.001 2S

0.02~0.06Alt

0.45~0.65Nb

0.01~0.025Ti）由脱硫铁水-100 t顶底复吹转炉-LF-RH-板坯CC流程冶炼。分析了引流砂质量（石墨含量0.22%~0.86%）

钢包钢水停留时间（<180~>270 min）

LF精炼温度（<1620~1690℃）出钢口垂直度

钢包上水口寿命（2~28次）对自开率影响。结果表明

引流砂中石墨含量低

钢包钢水停留时间长

LF精炼温度高

出钢口和钢流偏移

钢包上水口使用次数少

则钢包自开率低。通过稳定相关工艺因素

控制引流砂中石墨含量≥0.8%

LF钢水停留时间180~240 min

LF终点温度≤1 640℃等工艺参数

使抗酸钢的钢包自开率由84.52%提高到97.47%。

Abstract

The acid-resistant pipe line steel API X65 (/% : ≤0. 045C

0. 15 ~0. 35Si

1. 50 ~ 1. 65Mn

≤ 0. 008P

≤0. 001 2S

0.02 ~ 0.06Alt

0.45 ~ 0.65Nb

0.01 ~ 0. 025Ti) is melt by desulphurized metal-100 t top and bottom combined blowing Converter-LF-RH-slab CC flow sheet. The effect of process parameters including drainage sand quality ( graphite content 0. 22% ~0. 86% )

residence time of molten steel in ladle ( < 180 ~ > 270 min)

LF refining temperature ( < 1620 ~ 1690 ℃)，tap hole perpendicularity and ladle upper nozzle service life (2 ~ 28 times) on ladle free-opening rate has been analyzed. Results show that with lower graphite content in drainage sand

longer residence time of molten steel in ladle

higher LF refining temperature

tap nozzle and stream shifting

less service times of ladle upper nozzle

the ladle free-opening rate is lower. By stabilizing relative technology factors

controlling the process parameters including graphite content in drainage sand ^0. 8%

residence time of molten steel in ladle 180 ~ 240 min and LF end liquid temperature ≤1 640 °C

the free-opening rate of ladle with acid resistant steel increases from 84. 52% to 97. 47% .

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