摘要
在压力容器用钢同类产品技术要求、生产工艺调研的基础上,进行Q370R化学成分设计、轧制及正火工艺研究等工作,开展正火温度对试验钢性能、组织等影响研究。添加微合金元素Nb、V、Ti的钢板正火后强度下降,延伸率和冲击功显著提高,随着正火温度的升高,试验钢强度逐渐下降。而添加少量Cr元素轧态和同一正火工艺下钢板的强度均高于不添加Cr元素钢板,延伸率和冲击功值低于不添加Cr元素钢板,同时添加少量Cr元素,吨钢成本会有所增加。正火后组织为细晶粒铁素体和珠光体。综合考虑,试验钢采用添加微合金化元素Nb、V、Ti成分体系,经控制轧制,840~880℃正火后钢板性能满足标准要求。
Based on the investigation of technical requirements and production process for like products of pressure vessel steel, the chemical composition design, rolling and research of normalizing process for Q370R are carried out as well as the effects of normalizing temperature on the microstructure and properties of test steel are studied. After normalizing, the strength of steel plate added microalloying elements Nb, V and Ti is decreased, elongation and impact energy are increased significantly. With the increase of normalizing temperature, strength of test steel is decreased gradually. The strengths of steel plate with rolled state and the same normalizing process added a small amount of Cr are both higher than those of the steel plate without Cr, while the elongation and impact energy are lower than those of the steel plate without Cr. The cost of per ton of steel will be increased by adding a small amount of Cr. After normalizing, the microstructure is fine grained ferrite and pearlite. Based on the comprehensive consideration, test steel with the composition system of adding microalloying elements Nb, V and Ti as well as the properties of steel plate with controlled rolling and normalizing at 840~880 ℃ could meet the standard requirements.
作者
郭冬青
杨雄
王少炳
Guo Dong-qing;Yang Xiong;Wang Shao-bing(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5期35-38,共4页
Science & Technology of Baotou Steel
关键词
压力容器用钢
正火
组织
力学性能
冲击韧性
pressure vessel steel
normalizing
microstructure
mechanical properties
impact toughness
