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.
作者
张智刚
刘妍
宿成
李鹏
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)
出处
《包钢科技》
2022年第2期42-45,共4页
Science & Technology of Baotou Steel
