分别冶炼了3种不同铌含量的00Crl2Ni不锈钢，用光学显微镜和透射电镜观察了热轧退火态的显微组织，测量了试验钢的拉伸性能和不同温度的冲击功。试验结果表明：铌的添加显著抑制了退火时铁素体再结晶的发生。未添加稳定化元素铌的钢中析出相为cr23Cr23C6,ω（Nb）为0．28％的试验钢中析出相为Nb（C，N）和Fe3Nb3C，ω（Nb）为0．49％的试验钢中析出相为Nb（C，N）和FezNb，而且其析出相总体积分数明显高于其他2种试验钢。铌的添加提高了试验钢的强度，降低了试验钢的塑性和韧性，ω（Nb）为0．49％的试验钢冲击功最低，但其韧脆转变温度也最低。
There 00Crl2Ni stainless steels were smelt with different niobium contents. Microstructure after hot rolling and annealing was observed with optical microscope and transmission electron microscope. Tensile properties of the tested steels and their impact energies at different temperatures were measured. The results indicate that ferrite recrystallization during annealing is obviously hindered by niobium addition. Precipitated phases in steel without nio bium addition are erase6 , but the primary precipitated phases in steel containing niobium of 0.28% are Nb（C, N） and Fea Nh3 C. Precipitated phases in steel containing niobium of 0.49 % are Nb（C, N） and Fea Nb, and the total volume fraction of precipitated phases in these steels are evidently higher than those in the others. The strength was improved with niobium addition, but the plastic and toughness decrease with the increase in niobium content. The im pact energies of steel containing niobium of 0.49% is the lowest, but its ductile-brittle transition temperature is also the lowest.
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