Control of MnS Inclusion Characteristics in F45MnVS Non-quenched and Tempered Steel

白瑞娟; 刘成松; 谭雷红; 张华; 倪红卫

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Control of MnS Inclusion Characteristics in F45MnVS Non-quenched and Tempered Steel

更新时间：2026-01-21

- Control of MnS Inclusion Characteristics in F45MnVS Non-quenched and Tempered Steel
- Special Steel Vol. 43, Issue 5, Pages: 7-13(2022)
- 作者机构：
  
  1. ．武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉,430081
  2. ．河南济源钢铁（集团）有限公司,济源,459000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：30 March 2022，
  
  Online First：27 September 2022，
  
  Published：27 September 2022
- 稿件说明：
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白瑞娟, 刘成松, 谭雷红, et al. Control of MnS Inclusion Characteristics in F45MnVS Non-quenched and Tempered Steel[J]. Special Steel, 2022, 43(5): 7-13.
DOI：

白瑞娟, 刘成松, 谭雷红, et al. Control of MnS Inclusion Characteristics in F45MnVS Non-quenched and Tempered Steel[J]. Special Steel, 2022, 43(5): 7-13. DOI：

摘要

分析了改进前120 t LD-LF-RH-240 mm×240 mm CC工艺生产F45MnVS非调质钢中硫化物夹杂形貌、尺寸、数量密度等特性。通过采取以下改进措施：(1)转炉出钢过程脱氧铝锭加入用环绕钢液冲击区域分时段、分批次方式；(2)使用不含有MnS夹杂物的低碳低硫锰铁等合金辅料；(3)LF精炼过程S线喂入分批次加入等。试验结果表明：改进工艺后，LF、RH、中间包、铸坯以及轧材所有钢中硫化物夹杂的尺寸均有所降低，铸坯边缘、铸坯1/4处以及铸坯中心的大尺寸(＞5μm)夹杂物数量密度分别由改进前的35、83、51个/mm

下降至改进后的24、57、39个/mm

降幅分别达到31.43%、31.33%、23.53%。改进后轧材中细系和粗系夹杂物评级均有所改善，夹杂物长宽比为0～3的比例由改进前的63.07%增加至改进后71.23%。

Abstract

Morphology

size and number density of MnS inclusions of F45MnVS non-quenched and tempered steel produced by 120 t LD-LF-RH-240 mm x 240 mm CC process before improvement are analyzed. By adopting improvement measures including ： (1) the aluminum ingots for deoxidation are intermittently added into the molten steel in batches surrounding the impact zone during LD tapping； (2) low carbon and low sulfur ferromanganese without MnS inclusions being employed as alloy materials； and (3) added sulfur wire into the furnace ladle in batches during LF refining. Tlie experimental results show that based on the optimized production processes

the MnS inclusion sizes in steel during the production of LF

Tundish

continuous casting bloom and the rolled products are all effectively reduced. Co

mpared with the routine production processes before improvement

the number density of large scale inclusions (＞5μm) in the position of edge

1/4 and center of the casting bloom decreases from original 35

83 and 51 per mm

to 24

57 and 39 per mm

after the optimization

respectively. The decrease amplitude reaches 31.43%

31.33% and 23.53%

respectively. The ratings for the thin and thick inclusions in the steel products after rolling have been improved. The ratio of the inclusions with the length-width ratio in the range of 0-3 to the total inclusions increases from 63.07% before improvement to 71.23% after improvement.

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