新兴铸管钢水钙处理热力学计算及效果

针对新兴铸管炼钢部HRB500钢水钙处理做了热力学计算和现场取样分析。热力学计算结果表明,只需要加入较少的钙,即可使Al2O3变性为CaO·Al2O3,当钢中Al]=0.006%时,夹杂物变性为12CaO·7Al2O3需要Ca]≥4.1×10-6。在钢中Al]含量不变化的情况下,随着钢水温度的降低,钢中的Ca]含量也随之下降,才能满足夹杂物的成分在12CaO·7Al2O3附近。取样分析结果表明,目前喂CaSi线不足,夹杂物变性不完全。

EFFECT AND THERMODYNAMIC CALCULATION OF CALCIUM TREATMENT IN MOLTEN STEEL IN XINSING DUCTLLE IRON PIPES CO.

Based on the calcium treatment of HRB500 molten steel in the steel plant of XinXing Ductile Iron Pipes Corporation, a series of thermodynamic calculations and systematical sampling and comprehensive analysis were done. The result of the calculation shows that only adding a few calcium, can make Al2O3 modify into CaO · Al2O3. When Al ] = 0. 006% ,the condition that Al2O3 modifies into 12CaO · 7Al2O3 is Ca] ≥4.1 × 10^ -6. Under the circumstance of Al] is not changed, the Ca ] content will be also dropped with the temperature of the molten steel reducing in order to meet the components of inclusions in the vicinity of 12CaO · 7Al2O3. The result of the sample analysis shows that CaSi wire fed is inadequate, and inclusion modification is incompleted.