帘线钢表面氧化优化工艺及控制机理研究  

Control mechanism and surface oxidation process optimization of cord wire steel

作　　者：王丽萍[1] 王立峰[1] 罗志俊[1] 李舒笳[1] 王勇[1] 王猛[1] 马跃[1] 

机构地区：[1]首钢技术研究院,北京100043

出　　处：《材料科学与工艺》2014年第1期94-99,共6页Materials Science and Technology

摘　　要：采用OM和SEN分析方法研究了帘线钢空气气氛下连续氧化行为以及高线精轧、吐丝温度对热轧盘条表面氧化铁皮厚度和相组成的影响，同时采用热模拟方法分析了FeO层发生先共析、共析转变生成Fe3O4的条件。实验结果表明，945℃是帘线钢快速氧化起点温度，随着温度升高，氧化速率急剧增加；而当温度降低到700℃时，氧化过程极其缓慢。控制700～945℃范围内的冷速是控制氧化铁皮厚度及相组成的关键工艺。高线生产控制精轧和吐丝温度在900～940℃，氧化铁皮厚度7～20μm，FeO质量分数为65％～80％，具有最佳除鳞性能。热模拟分析表明，400～500℃是FeO层发生共析转变的“鼻尖”温度，孕育期最短。提高400～500℃区间冷速可抑制FeO层发生共析转变，使机械除鳞率提高3％左右。wire rod analyzed proeutect ： Effect of finish rolling and spinning temperature on thickness and phase composition of hot rolling surface oxide scale, continuous oxidation behavior under air atmosphere of cord wire steel was by means of Optical Microscope （OM）, Scanning Electron Microscopy （SEM）, and the conditions of oid and eutectoid transformation in FeO layer was analyzed by means of thermal simulation. The results indicate that 945 ℃ is the starting point of rapid oxidation, but the oxidation rate is very slow below 700 ℃. The cooling rate between 700-945 ℃ is the key process parameter of controlling thickness and phase composition of oxide scale. When the finish rolling and spinning temperature are controlled in the range of 900- 940℃ , the oxide scale thickness is 7 - 20 μm and the FeO mass percent is 65% - 80%, which can meet the descaling performance. Thermal simulation results indicate that 400 - 500 ℃ is“ nose temperature” of eutectoid transformation of which the incubation period is the shortest in FeO layer. The cooling rate in the range of 500-400 ℃ is the main method to inhibit eutectoid transformation in FeO layer, and the mechanical descaling rate can be increased by about 3%.

关 键 词：帘线钢 轧制工艺 氧化铁皮 FeO层 先共析Fe3O4 共析转变 

分 类 号：TG142.1[一般工业技术—材料科学与工程]