不锈钢VOD精炼吹氧阶段脱碳保铬的热力学分析

doi:10.13228/j.boyuan.issn1005-4006.20210087

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摘要为了保证VOD吹氧阶段高脱碳量和铬的高回收率,以不锈钢ZG06Cr13Ni4Mo为研究对象,采用热力学计算软件FactSage8.1对VOD精炼过程吹氧阶段的供氧量、温度及真空度等参数对钢液中碳、铬含量的影响进行了分析,并在单因素计算的基础上设计了三因素三水平的正交试验,确定了供氧量、温度及真空度对脱碳保铬影响的顺序以及优化参数。结果表明,吹氧阶段供氧量应控制在4.68~6.10 m³/t(标准态)范围内;开吹温度应设置在1 585~1 600 ℃内且停吹温度不应超过1 750 ℃;压强应控制在5~9 kPa。此外,3种因素对吹氧阶段脱碳保铬的影响顺序为供氧量>真空度>温度,优化结果为供氧量4.9 m³/t(标准态)、温度1 600 ℃、压强7 kPa,且在此条件下的碳、铬质量分数分别为0.027%、12.201%。

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	方燕红
	杨晨曦
	王成瑞
	梁光芬
	李言栋
	段华美

关键词 ： VOD精炼, 吹氧阶段, 脱碳保铬, 热力学计算, 正交试验

Abstract：In order to ensure high decarburization and high recovery rate of chromium in the VOD oxygen blowing stage, the influence of oxygen supply, temperature and vacuum degree on the carbon and chromium content of ZG06Cr13Ni4Mo stainless steel during the oxygen blowing process of VOD were calculated by FactSage8.1. And orthogonal experiments were carried out to determine the order and optimal value of oxygen supply, temperature and vacuum degree on decarburization and chromium preservation. These results show that the oxygen supply in the oxygen blowing stage should be controlled within the range of 4.68-6.10 m³/t (normal). The temperature of blowing oxygen should be set within 1 585-1 600 ℃ and the temperature of stopping blowing oxygen should not exceed 1 750 ℃. The pressure ought to be controlled within 5-9 kPa. Based on the orthogonal experiment, the results indicate that the factor of oxygen supply has the greatest impact and followed by vacuum, then temperature. The optimized conditions are oxygen supply of 4.9 m³/t (normal), temperature of 1 600 ℃, and pressure of 7 kPa, respectively. Under this condition, the carbon mass fraction and chromium mass fraction are 0.027% and 12.201%, respectively.

Key words： VOD refining oxygen blowing process decarburization and chromium preservation thermodynamic calculation orthogonal experiment

收稿日期: 2021-07-17

引用本文:

方燕红, 杨晨曦, 王成瑞, 梁光芬, 李言栋, 段华美. 不锈钢VOD精炼吹氧阶段脱碳保铬的热力学分析[J]. 连铸, 2022, 41(1): 25-30. FANG Yan-hong, YANG Chen-xi, WANG Cheng-rui, LIANG Guang-fen, LI Yan-dong, DUAN Hua-mei. Thermodynamic analysis of decarburization and chromium preservation of stainless steel in oxygen blowing process of VOD. CONTINUOUS CASTING, 2022, 41(1): 25-30.

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