马钢SPHC钢钙处理的热力学分析

针对马钢CSP生产的SPHC钢钙处理现状,应用热力学平衡模型计算了钙处理钢液中的S-Ca、Al-Ca平衡反应,得出CaS容易在相对较高和温度较低时析出,1 873K时变性处理形成C_(12)A_7和C_3A的理论钙铝比值应分别满足w(Al])~2/w(Ca])~3≤2.90×10~5和9.62×10~3。参照实际生产数据,经分析提出该钢种钙处理时w(Al])~2/w(Ca])~3≤5.0×10~4、w(Ca])/w(Al])为0.09~0.11、w(S])≤0.003%等的合理控制范围。

Thermodynamic analysis of calcium treatment for SPHC steel in Masteel

Based on the calcium treatment for SPHC steel during the CSP production in Masteel，the equilibrium reactions for S-Ca and Al-Ca are calculated according to thermodynamic equilibrium model．It is concluded that the CaS is easy to precipitate in a relatively higher sulfur content and a lower temperature．At 1 873 K，theoretical calcium aluminum ratio to form liquid C12A7 and C3A after modification should make the ratio of w(［Al］)2/w(［Ca］)3 no more than 2.90×105 and 9.62×103，respectively. By reference to the actual production data，through the analysis it is proposed that the ratio of w(［Al］)2/w(［Ca］)3 should be no more than 5.0×104，the ration of w(［Ca］)/w(［Al］) should be in the range of 0.09-0.11 and the w(［S］) should be equal to or less than 0.003% during the calcium treatment.