摘要
采用光学显微镜、扫描电子显微镜、能谱仪等仪器设备,对海洋石油平台用SM490YB热轧H型钢-20℃横向低温冲击韧性合格率偏低的原因进行分析。结果表明,钢中存在Al 2O 3大颗粒夹杂物、较硬的贝氏体组织、晶粒粗大及带状组织是造成试验钢低温冲击韧性差的主要原因。通过降低试验钢的碳含量,优化冶炼及轧制工艺,试验钢的晶粒尺寸、夹杂物得到细化,组织类型得到优化,试验钢-20℃横向低温冲击韧性得到明显改善,-20℃冲击合格率由80%提高到100%。
The causes for lower qualified rate of transverse low temperature impact toughness at-20℃of SM490YB hot-rolled H beam for offshore oil platform are analyzed with such instrument and equipment as the optical microscope,scanning electron microscope and energy spectrometer.The results showed that the poorer low temperature impact toughness of test steel was caused by large Al 2O 3 inclusion,harder bainite structure,coarse grain and banded structure in the steel.The transverse low temperature impact toughness at-20℃of test steel is improved obviously and qualified rate of impact at-20℃is increased from 80%to 100%by reducing carbon content of test steel as well as optimizing smelting and rolling processes so that the grain size and inclusions of test steel are refined as well as types of microstructure are optimized.
作者
彭飞
惠治国
李洪芳
Peng Fei;Hui Zhi-guo;Li Hong-fang(Chemical Inspection Center of Inner Mongolia Baotou Steel Union 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6期53-57,共5页
Science & Technology of Baotou Steel
