摘要：为了避免或减少铌-钛微合金化中碳硼钢320mmx280mm铸坯(%/:0.35C,0.04Si,0.87Mn,0.010P,0.007S,0.27Cr,0.031Alt,0.03Nb,0.030Ti,0.0018B,0.0046N)表面裂纹，研究了该钢种连铸坯的高温力学性能,并对高温拉伸断口和断口附近显微组织进行了观察。结果表明:在600~1250C,试验钢在600C时的断面收缩率为54.4%,其它测试温度点的断面收缩率均高于60%;试验钢第I脆性区>1200C,第I脆性区在750~850C,在850~1200C试验钢具有良好的热塑性;试验钢在800C时具有相对偏低塑性,但拉伸断口微观下仍以韧窝形貌为主;试验钢在实际连铸生产时,采用≤I.0m/min铸速和≥950C矫直温度,连铸坯表面质量良好。关键词： 下载高清全文——铌_钛微合金化中碳硼钢连铸坯的高温力学性能.pdf