600MPa级高强钢热轧卷取工艺研究及应用  

Research and application of hot rolling coiling process for 600 MPa high strength steel

作　　者：张亮亮 于洋 李晓军 史震 ZHANG Liang-liang;YU Yang;LI Xiao-jun;SHI Zhen(Jingtang Technology Center,Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China;Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063210,Hebei,China)

机构地区：[1]首钢集团有限公司技术研究院京唐技术中心,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043 [3]首钢京唐钢铁联合有限责任公司制造部,河北唐山063210

出　　处：《中国冶金》2022年第12期106-112,共7页China Metallurgy

基　　金：首钢技研院/018/自研项目(2019RZ02)。

摘　　要：为了探究卷取过程热轧带钢的氧化铁皮和组织性能的变化规律,采用扫描电镜、电子探针、光学显微镜、透射电镜和拉伸试验机等研究了不同卷取温度和冷却方式对600 MPa级热轧带钢表面质量和组织性能的影响。结果表明,650、600℃卷取温度下,与缓慢冷却方式相比,采用快速冷却方式可有效改善热轧带钢表面氧化铁皮的结构,使氧化铁皮中FeO比例提高10%~15%,氧化铁皮厚度下降25%~30%,同时有效减弱热轧带钢表面氧化铁皮与基体界面硅元素和锰元素富集;不同冷却工艺下热轧带钢中的晶粒尺寸相近;650℃卷取+快速冷却工艺下热轧带钢的屈服强度最高,试样断口的位错密度最高,但断后伸长率并未明显下降。In order to explore the change law of iron oxide scale, microstructure and property of hot rolled strip during coiling, the scanning electron microscope, electron probe, optical microscope, transmission electron microscope and tensile testing machine were used to study the effects of different coiling temperatures and cooling methods on the surface quality and microstructure properties of 600 MPa hot rolled strip. The results show that at the coiling temperature of 650 and 600 ℃, compared with the slow cooling method, the rapid cooling method can effectively improve the structure of iron oxide scale on the surface of hot rolled strip, increase the proportion of FeO in the iron oxide scale by 10%-15%, and decrease the thickness of iron scale by 25%-30%. At the same time, it can effectively weaken the enrichment of silicon and manganese elements at the interface between the iron oxide scale on the surface of hot rolled strip and matrix. The grain size in the hot rolled strip under different cooling processes is similar. The yield strength of hot rolled strip under the process of 650 ℃ coiling + rapid cooling is the highest, and the dislocation density at the fracture of sample is the highest, but the elongation after fracture does not decrease significantly.

关 键 词：卷取温度 冷却方式 高强钢 氧化铁皮 组织性能 

分 类 号：TG335.11[金属学及工艺—金属压力加工]