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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Control of complex inclusions in high strength ship plate steel by reducing calcium treatment
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Control of complex inclusions in high strength ship plate steel by reducing calcium treatment

机译：通过减少钙处理来控制高强度船钢板复杂夹杂物

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摘要

To eliminate nozzle clogging during continuous casting of ship plate steel and reduce the calcium addition required, the composition of CaO-MgO AI2O3 inclusions in the liquid phase region must be controlled. Thermodynamic calculations using FactSage show that when the balanced Al content is 0.03 mass %, aCa in the liquid steel is 1-10 ppm, and aMg is 0.01-0.3 ppm; and when the balanced Al content is 0.06 mass %, aca in the liquid steel is 1-30 ppm, and aMg is 0.05-0.9 ppm. The CaO-Al_2O_3-CaS inclusions can be controlled in the liquid region below 1600°C at aCa values of 5 ppm, 15 ppm, and 30 ppm, and the balanced Al content should be controlled in the range of 0.001-0.050,0.005-0.250, and 0.010-0.50 mass %, respectively. Based on theoretical analysis, the refining slag composition should be controlled to 45-53 mass % CaO, 30-37 mass % Al_2O_3,6-12 mass % SiO_2, and 6-8 mass % MgO. Optimization of the slag system and steel composition can reduce, or even eliminate, the requirement for calcium treatment The total oxygen content in the slab can be controlled to 15-21 ppm, with typical micro-inclusions s;10 urn in size, with compositions in the CaO-Al_2O_3-MgO and CaO-Al_2O_3-CaS systems.
机译：为了消除船板钢连续铸造期间的喷嘴堵塞并减少所需的钙添加，必须控制液相区域中的CaO-MgO Ai2O3夹杂物的组成。使用事实的热力学计算表明，当平衡的Al含量为0.03质量％时，液体中的ACA为1-10ppm，AMG为0.01-0.3ppm;并且当平衡的Al含量为0.06质量％时，液体中的ACA为1-30ppm，AMG为0.05-0.9ppm。 CaO-Al_2O_3-CAS夹杂物可以在5ppm，15ppm和30ppm的ACA值下控制在1600℃以下1600℃的液态区域中，平衡Al含量应控制在0.001-0.050,0.005- 0.250和0.010-0.50质量％。基于理论分析，精炼炉渣组合物应控制在45-53质量％CaO，30-37质量％Al_2O_3,6-12质量％SiO_2和6-8质量％MgO。炉渣系统和钢组合物的优化可以减少，甚至消除，钙处理的要求可以将板坯中的总氧含量控制在15-21ppm，具有典型的微夹杂物S; 10 URN的大小，组合物在CAO-AL_2O_3-MGO和CAO-AL_2O_3-CAS系统中。

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