Abstract: The effect of two processes of calcium treatment: two step process (LF + Ca-Si wire feeding - VD + Ca- Si wire feeding) and one step process (LF - VD + Ca-Si wire feeding) at Xiangsteel on morphology of inclusions and mechanical properties of Nb-Ti microalloying grade E hull steel (0. 10%C) has been studied by thermodynamic calculation on equilibrium of Als - [O] and equilibrium of Ca_residual- Als. Results showed that as S in steel ≤0. 003% , T[O] ≤15 x 10^-6, and controlled Als in steel 0. 02% 〜0. 04% , after one step process of calcium treatment the W4 pun spherical inclusions in steel were up to 93% , and cross impact energy at -40 t was 156 -240 J.

Key words: Grade E Hull Plate, Ca Treatment, Mechanical Properties

摘要： 通过Als-[O]平衡和Ca_残-Als平衡的热力学计算,研究了湘钢Nb-Ti微合金化E级船板钢(0.10%C)两种钙处理工艺:两步法(LF+喂Ca-Si线-VD+喂Ca-Si线)和一步法(LF-VD+喂Ca-Si线)对钢中夹杂物形态和力学性能的影响。结果表明,当钢中S≤0.003%,T[O]≤15×10^-6,Als控制在0.02%～0.04%时,进行一步法钙处理后钢中≤4μm的球形夹杂物达93%,-40℃的横向冲击功为156～240J。

关键词: E级船板钢, Ca处理, 力学性能