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通过金相分析、扫描电镜、能谱分析等手段对国内某钢厂生产石油套管钢的水口堵塞物进行了分析,对冶炼过程Al2O3夹杂的控制问题从热力学角度进行了研究。热力学计算结果表明,当钢中的酸溶铝含量为0.025%(质量分数,余同)时,若钙处理时钢中钙含量高于22×10-6,硫含量低于0.008%,可较容易地将Al2O3夹杂变性为低熔点易上浮的C12A7。在热力学计算基础上,通过强化钢水钙处理,钢中钙含量提高至25×10-6～40×10-6,夹杂物变性上浮容易,连浇炉数由3～4炉提高至大于8炉。
The nozzle blockage of petroleum casing steel produced by a steel mill in China was analyzed by means of metallographic analysis, scanning electron microscopy and energy spectrum analysis. The control of Al2O3 inclusions in smelting process was studied from the thermodynamic point of view. Thermodynamic calculation results show that when the content of acid-soluble aluminum in steel is 0.025% (mass fraction), the content of calcium in steel is higher than 22 × 10-6 and the content of sulfur is lower than 0.008% Al 2 O 3 inclusions are readily denatured into C12A7, a low melting point readily floating. On the basis of thermodynamic calculation, the calcium content in the steel is increased to 25 × 10-6 ~ 40 × 10-6 by strengthening the molten steel calcium treatment. The inclusions are easy to denature and float. The number of continuous casting furnace is increased from 3 to 4 to more than 8 .