微合金元素Ti-Nb对低碳贝氏体钢组织和力学性能的影响  

Effect of Microalloying Elements Ti-Nb on Structure and Mechanical Properties of Low Carbon Bainitic Steel

作　　者：曹慧泉[1,2] 颜慧成[1] 夏政海[3] 罗登[3] 李广敏[1] 仇圣桃[1] 

机构地区：[1]钢铁研究总院国家连铸技术工程研究中心,北京100081 [2]湖南华菱管线股份有限公司,长沙410011 [3]湖南华菱湘潭钢铁有限公司,湘潭411101

出　　处：《特殊钢》2010年第1期52-54,共3页Special Steel

摘　　要：试验的700 MPa级低碳贝氏体钢由30 kg真空感应炉熔炼铸成断面100 mm×50 mm扁锭-轧成12mm板。通过CCT曲线和3～30℃/s冷却速度下组织的分析,研究0.01Ti-0.03Nb和0.06Ti-0.05Nb两种微合金化对(%)0.059～0.066C、1.41～1.67Mn、0.30～0.36Si、0.37～0.48Cu、0.21～0.24Ni、0.18～0.22Mo、0.000 8～0.002 2Bs、0.002 6N低碳贝氏体组织和力学性能的影响。结果表明,0.06Ti-0.05Nb钢的强度高于0.01Ti-0.03Nb钢,但前者Ti含量高,-40℃冲击功较后者低。700 MPa级低碳贝氏体钢合适的微合金化Ti-Nb成分为0.04%～0.05%Nb-0.015%～0.025%Ti。Test 700 MPa low carbon bainitic steel is melted by a 30 kg vacuum induction furnace, cast to 100 mm × 50 mm flat ingot and rolled to 12 mm plate. Based on CCT curves and analysis on structure of steel at cooling rate 3 - 30℃/s, the effect of two group microalloying： O. 06Ti-0. 05Nb and 0. 01Ti4）. 03Nb on structure and mechanical properties of low carbon bainitic steel- % ： 0. 059 -0. 066C, 1.41 - 1.67Mn, 0. 30 -0. 36Si, 0. 37 -0. 48Cu, 0, 21 -0. 24Ni, 0. 18 0. 22Mo, 0.000 8 - 0.002 2Bs, 0. 002 6N has been studied. Results show that the strength of steel with 0. 06Ti-0. 05Nb is higher than that of steel with 0. 01Ti-0. 03Nb, but the impact energy at -40℃ of the former, of which the Ti content is higher, is lower than that of the later. The available microalloying Ti-Nb content in 700 MPa low carbon bainitic steel is 0. 015% - 0. 025% Ti-0.04% - 0. 05% Nb.

关 键 词：低碳贝氏体钢 Ti—Nb微合金化 组织 力学性能 

分 类 号：TG142.13[一般工业技术—材料科学与工程]