生产低碳铝镇静钢过程中,为了控制夹杂物形态,一般要对其进行钙处理.如何使钙处理过程中生成液态的钙销酸盐夹杂是生产控制的难点和重点.通过理论计算得出在一定条件下[Ca]-[Al]、[S]-[Al]关系图,以某低碳铝镇静钢为例,当w([Al])为0.03%时,控制w([Ca])为(9～15.8)×10~(-6),可以生成成分接近(CaO)_(12)(Al_2O_3)_7的液相夹杂.钢中w([S])为30×10~(-6),w([Al])为0.03%～0.04%,温度降低到1723 K以下时,在(CaO)_(12)(Al_2O_3)_7上会析出CaS.
Generally,in order to control the morphologies of inclusions,the low carbon Al-killed steel should be treated with calcium.It's difficult and important to make the inclusions to be liquid(CaO)_x(Al_2O_3)_y inclusions though the processing control.Correlation figures between solute calcium and solute aluminum,also between solute sulfur and solute aluminum have been established theoretically.Taking a kind of low carbon Al-killed steel for exampie,when the solute aluminium is 0.03 percent and the calcium is controlled at(9-15.8)×10~(-6),the liquid approximate(CaO)_(12)(Al_2O_3)_7 inclusions will produce in the molten steel.If the solute sulfur is blow 30×10~(-6) and the solute aluminium iS between 0.03 and 0.04 percent in the molten steel,when the temperature is below 1723 K,the CaS will precipitate on the(CaO)_(12)(Al_2O_3)_7 surface.
参考文献
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