（1. Plate Technology Department， Research Institute of Technology， Shougang Group Corporation， Beijing 100043，China 2. Beijing Engineering Research Center of Energy Steel， Beijing 100041， China 3. Rolling Department， Shouqin Metal Materials Co.，Ltd.， Qinhungdao 066326， Hebei， China）
Abstract：In order to study the influence of tempering temperature on mechanical properties of F/B steel，420 MPa structural steel produced by Controlled Rolling， Relaxation and ACC processing was topics of research and studied by means of mechanical property test and microstructure observation with optical microscope and transmission electron microscopy. The results show that there is no change in the proportion of ferrite and bainite during the tempering process. With the increases of tempering temperature， M-A island decomposes and grain of ferrite grows up. At the same time， yield strength increases obviously but the tensile strength increases slowly， thereby yield ratio rises from 0.80 to 0.88. Changes of properties are caused by recovery， grain growth， interaction between dislocation and precipitation. In order to relieve stresses and meet technical requirements， the recommended tempering process is （400±10） ℃， （2×thickness） min.
黄乐庆，王彦锋，狄国标，杨永达，韩承良. 回火温度对F/B结构钢组织及性能的影响[J]. 钢铁, 2017, 52(9): 79-83.
HUANG Le-qing，，WANG Yan-feng，DI Guo-biao，YANG Yong-da，HAN Cheng-liang. Influence of tempering temperature on microstructure and mechanical properties of F/B structural steel. Iron and Steel, 2017, 52(9): 79-83.
P.C.M.Rodrigues, EV.Pereloma, D.B.Santos, Mechanical Prosperities of an HSLA bainitie steel subjected to controlled rolling with accelerated cooling, Materials Science Engineering A, 283 , 136(2000
P.C.M.Rodrigues, EV.Pereloma, D.B.Santos, Mechanical Prosperities of an HSLA bainitie steel subjected to controlled rolling with accelerated cooling, Materials Science Engineering A, 283 , 136(2000
2017, Vol. 52 
