Abstract： In order to develop Q690E high strength steel with low cost and high additional value, the effects of intercritical heat treatment and quenchedtempered process on microstructure and mechanical properties were investigated. The results show that the impact toughness of test steel with prior microstructure containing plenty of massive ferrite can be deteriorated while the intercritical quenching temperature was 810℃. However, by the same intercritical heat treatment, the final microstructure of test steel with prior lath martensite structure consists of much finer martensite and acicular ferrite existed among martensite phase. The Charpy impact energy at -40℃ reaches 247J, but the strength is much lower. The excellent comprehensive mechanical properties can be obtained by quenching and tempering heat treatment. Through the correction of process parameters, the strength and toughness of industrial products (660mm) can meet the standard completely.
康健,王昭东,王国栋,刘丽华,梁川. 低成本工程机械用Q690E级高强钢的热处理工艺与工业化[J]. 钢铁, 2011, 46(6): 86-90.
KANG Jian1,WANG Zhaodong1,WANG Guodong1,LIU Lihua2,LIANG Chuan2. Heat Treatment and Industrial Application of Q690E High Strength Steel With Low Cost for Engineering Mechanism. Iron and Steel, 2011, 46(6): 86-90.
2011, Vol. 46 
