Abstract: The research and application of functional oxidation resistant coating of cast steel at high temperature were reviewed, including its type, composition and protective mechanism. Such coating is composed of high melting-point materials, such as SiO2, Al2O3 and MgO, low melting-point materials, such as TiO2 and CaO, as basic materials, water glass, borate and aluminium phosphate as binder with some other special functional materials. By comparing various kinds of coating, the protective mechanism of coatings and design fundamental were discussed. How to increase adaptability of coating to different steel and service conditions, to enhance the protective effect, stability and suspension property, to resolve the distribution, adhesion and to ensure the heat conduction are the future research topics.

Key words: coatings, oxidation resistance, decarburization, billet, high temperature protection

摘要： 对钢坯热轧高温防护功能涂层研究(涂层分类、组分分类、保护机理)及其实际应用进展进行了概述，归纳指出涂层基本组成是以高熔点物质(如SiO2, Al2O3, MgO)和低熔点物质(如TiO2, CaO)作为基材，水玻璃、硼酸盐和磷酸铝类为粘结剂，并配某些功能组分为特殊成分. 论述了涂层材料的主要防护机理和设计原则，并指出增加涂层对不同钢种及使用条件的适应性，提高涂层材料保护效果、稳定性、悬浮性，解决喷涂均匀性、粘附性问题及保证涂层的热传导性能等是未来涂层研究的发展方向.

关键词: 涂层, 防氧化, 脱碳, 钢坯, 高温防护