Effect of slag composition on steel cleanliness in interstitial-free steel

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-06-01 DOI:10.1016/S1006-706X(17)30088-2
Rui Wang , Yan-ping Bao , Yi-hong Li , Tai-quan Li , Di Chen
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引用次数: 9

Abstract

Ladle slag affects steel cleanliness at the end of the Ruhrstahl-Hereaeus (RH) and holding process. The relationship between composition of ladle slag, total oxygen (TO) and inclusions was investigated using X-ray fluorescence (XRF), infrared absorption, and SEM + EDS methods. The results indicate that TO in steel at the end of RH increases linearly with increasing FeO content in slag. TO is lower when ωCaO/ωAl2O3(C/A)=1.5-2.0 than that of C/A = 1.0–1.4 under an approximate content of FeO. During the holding process, irregular Al2O3 inclusions are newly generated due to slag reoxidation. Additionally, Al2O3-Tix O inclusions are newly generated in the steel when the content of FeO is higher. By combining experimental and thermodynamic calculation results, it is determined that the slag has a good melting property within the zone of C/A=1.2–1.8 and adsorption capacity of Al2O3 when the content of SiO2 in slag is controlled at 4%–6%. The increase in the C/A ratio and the decrease of FeO content in slag can slow down the reoxidation rate.

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无间隙钢中炉渣成分对钢材清洁度的影响
钢包渣在鲁尔施塔尔-赫里氏(RH)和保温过程结束时影响钢的清洁度。采用x射线荧光(XRF)、红外吸收、SEM + EDS等方法研究了钢包渣成分、总氧(TO)和夹杂物之间的关系。结果表明:随着渣中FeO含量的增加,RH末端钢中的TO呈线性增加;当cao /ωAl2O3(C/A)=1.5 ~ 2.0时,TO低于C/A = 1.0 ~ 1.4时,FeO含量相近。在保温过程中,由于炉渣再氧化,新生成不规则Al2O3夹杂物。当FeO含量较高时,钢中新生成Al2O3-Tix O夹杂物。结合实验和热力学计算结果,确定当渣中SiO2含量控制在4% ~ 6%时,渣在C/ a =1.2 ~ 1.8范围内具有良好的熔融性能和对Al2O3的吸附能力。C/A比的提高和渣中FeO含量的降低可以减缓再氧化速率。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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