Abstract: The control rolling and cooling test of ferrite-bainite dual phase steel (/% :0. 22C,0. 47Si,2. 50Mn, 0.05Al,0.02Nb,0.41 Cu) with finishing rolling at 800 ~860 ℃. is carried out by a Φ450 mm mill in laboratory. The results show that a microstructure containing ferrite, bainite, martensite and retained austenite in test steel can be obtained ；the ferrite grains are refined with decreasing finish rolling temperature and accelerating cooling；the amount of retained austenite is 11.4% when the steel finished rolling at 800 °C and subsequent laminar cooled to 560 ℃. and then air cooled to room temperature to contribute a lot to comprehensive properties of strength and toughness, its mechanical properties are UI R_m 1131 MPa,R_p0.2/Rm 0.61，R_m xA₅₀ 18096 MPa · %

Key words: Ultrahigh-Strength Dual-Phase Steel, Controlled Rolling and Cooling, Low Finish Rolling Temperature, Accelerating Cooling 

摘要： 在实验室Φ450 mm轧机上进行了铁素体/贝氏体双相钢（/%:0.22C,0.47Si,2.50Mn,0.05Al,0.02Nb,0.41 Cu）终轧800～860℃的控轧控冷实验。结果表明,实验钢经控轧控冷后,获得以铁素体/贝氏体双相组织为主并含有少量残余奥氏体+马氏体的复相组织。降低终轧温度、加快冷却速度可使铁素体晶粒细化。800℃终轧后层流冷却到560℃,然后空冷到室温的实验钢组织中残余奥氏体含量为11.4%,对强度和韧性的良好匹配贡献很大,其力学性能为:抗拉强度（R_m）1131MPa ,屈强比(R_p0.2/R_m)0.61,伸长率(A₅₀)16%,强塑积(Rm×A₅₀)18096 MPa·%