高铬铸钢轧辊的组织及其氧化行为

轧辊氧化膜形成及剥落显著影响轧辊的辊耗及钢板的表面质量。为控制轧辊的氧化行为，采用增重法研究离心铸造高铬铸钢轧辊在大气及水蒸气环境中的氧化行为，并采用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)等方法研究了高铬铸钢组织及氧化膜的结构。结果表明，高铬铸钢组织为回火马氏体基体和共晶Cr7C3碳化物；氧化过程中基体优先被氧化，粗大碳化物表面几乎不被氧化；温度及环境对氧化膜生长及相结构都有一定的影响，高温及水蒸气环境加速氧化，并促进γ Fe2O3向γ Fe3O3转化。因此，控制轧辊的氧化，关键是控制轧辊的使用温度。     

The corrosion behavior and mechanism of X65 steel induced by iron‐oxidizing bacteria in the seawater environment

The corrosion behavior and mechanism of iron‐oxidizing bacteria (IOB) on X65 steel in seawater are studied. This study uses the methods of weight loss, electrochemical measurements, and surface analysis. The results show that the IOB increases the corrosion damage degree of steel. Pittings are observed in the medium with IOB. The potentiodynamic polarization curves show that the anodic reaction rate is accelerated in the corrosion process of IOB. The synergies in corrosion between the metal surface, abiotic corrosion products, and bacterial cells, and the pitting corrosion mechanism of X65 steel are discussed.     

异型中间包结构优化对帘线钢夹杂物的影响

为了解决帘线钢中因大颗粒夹杂物导致的拉拔断裂问题，通过水模型研究结果对异型中间包结构改进优化，并将优化异型中间包结构进行工业试验。结果表明，挡墙优化结构后,去除夹杂物的效果明显提高，采用优化的挡墙中间包生产的帘线钢铸坯中夹杂物尺寸不大于10 μm比例为87.95%，平均尺寸为6.7 μm；大颗粒的高MgO类和高SiO2类夹杂物已得到有效去除，盘条中B细不大于0.5级比例达到97.56%。