Ti微合金化700 MPa级大梁钢组织和性能研究  

Study on Microstructure and Properties of Ti Microalloyed 700 MPa Grade Beam Steel

作　　者：张智刚 刘妍 宿成 李鹏[2] 徐龙 刘德勤 Zhang Zhi-gang;Liu Yan;Su Cheng;Li Peng;Xu Long;Liu De-qin(Inner Mongolia Baotou Steel Rare Earth Steel Plate Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢稀土钢板材有限责任公司,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010

出　　处：《包钢科技》2022年第2期42-45,共4页Science & Technology of Baotou Steel

摘　　要：文章对比分析了低C+Mn+Ti和低C+Mn+Ti+Nb两种成分设计的700 MPa级大梁钢组织和性能,结果表明,在相同强度情况下,单Ti微合金化产品和Nb-Ti复合微合金化产品塑性相同,但低温冲击韧性较差,前者在-20℃发生脆性转变,而后者在-50℃才发生脆性转变。通过提高粗轧首道次压下量和中间坯厚度有助于改善单Ti微合金化大梁钢低温冲击韧性,使其达到Nb-Ti复合微合金化产品控制水平。In this paper,the microstructure and properties of 700 MPa grade beam steel with such two composition designs as low C+Mn+Ti and low C+Mn+Ti+Nb are compared and analyzed.The results showed that the plasticity of single Ti microalloyed product and that of Nb-Ti multi-microalloyed product were the same with the same strength,but the low temperature impact toughness of single Ti microalloyed product was poorer so that its brittle transition was at-20℃,while the brittle transition of Nb-Ti multi-microalloyed product was at-50℃.It could be improved through increasing the rolling reduction of the first pass of rough rolling and thickness of intermediate billet so as to reach the control level of Nb-Ti multi-microalloyed products.

关 键 词：TI微合金化 Nb-Ti复合微合金化 700 MPa级 低温韧性 控轧工艺 

分 类 号：TG142.1[一般工业技术—材料科学与工程]