Abstract：The reason for the unqualified[z-direction]properties of the Nb-bearing high strength ship plate steels was analyzed. The microstructures and[z-direction]tensile fracture samples were observed by optical microscope (OM) and scanning electron microscope (SEM) and the solid dissolved temperature of NbC in the steel was calculated according to the Thermo-Calc software and the solubility expression of NbC in austenite. The results showed that gathered precipitates with Nb and trip-liked sulfide inclusions (MnS) were the main reason for the unqualified[z-direction]properties of the tested steels. While the increase of heating temperature is advantageous to dissolve the precipitates with Nb， the conventional rolling heating is hard to eliminate the adverse effects of large precipitates on the[z-direction]properties of the steel.
收稿日期: 2015-03-11
出版日期: 2015-10-12
引用本文:
王小勇，狄国标，杨永达，王彦锋，麻庆申. 铌微合金化高强船板钢[z]向性能不合原因分析[J]. 钢铁, 2015, 50(10): 85-89.
WANG Xiao-yong， DI Guo-biao，YANG Yong-da，WANG Yan-feng，MA Qing-shen. Analysis of reasons for the unqualified[z-direction] properties of Nb-bearing high strength ship plate steels. Iron and Steel, 2015, 50(10): 85-89.
2015, Vol. 50 
