Research on Purity Control of Tube Bloom
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摘要: 通过对管坯钢代表钢种进行热力学模拟计算,设计了管坯钢脱氧工艺以及精炼渣系控制工艺。采用不同的深脱氧措施和钢包渣组成控制方案可满足不同品种对钢质的要求。工业试验表明,工艺措施实施以后,管坯钢纯净度得到有效控制。精炼终渣光学碱度控制在0.75~0.80、Ca O/Al2O3控制在2.0~2.5时,钢液T[O]<20×10-6;[Als]>0.015%时铸坯T[O]<20×10-6,而[Als]>0.020%时,铸坯T[O]<15×10-6。非金属夹杂总含量平均为21.6×10-6,夹杂评级全部满足要求。[S]要求较高的代表品种B(PSL2)、JS25Mn,平均硫含量分别为0.005%、0.008%。Abstract: In this paper thermodynamics analog calculation has been made for tube bloom in order to obtain a deoxidization technology and refining slag system. Industrial tests showed that if optical basicity and CaO /Al2O3 could be controlled at 0.75~0.80 and 2.0~2.5 respectively,then T[O]＜ 20 × 10-6 in molten steel.T[O] decreases with increasing [Als] for bloom,where [Als] exceeds 0.015% then T[O] ＜ 20 × 10-6,and[Als]＞0.020% then T[O]＜15 ×10-6. The resulting technology can be effectively used to control the degree of purity. When T[O]≤2.0 × 10-6,total content of non-metallic inclusion averages 21.6 ×10-6 and all of the inclusion rating meet the requirements. For typical steel grades like B （PSL2） and JS25 Mn with stricter demand for [S]%,the average [S]have been controlled at 0.005% and 0.008% respectively.
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Key words:
- tube bloom /
- thermodynamics /
- refining /
- desulfurization degree /
- purity /
- inclusion /
- T[O] /
- [S]
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