| 摘要 |
PURPOSE:To suppress the generation of a scale when heating and improve stripping property of the scale by coating the mixture of specified proportion of specified metallic powder, its oxide, silicic acid anhydride, kaolin and a water glass on the surface of a carbon powder layer formed on the surface of a steel material. CONSTITUTION:The carbon powder (graphite etc.) and a binder (the water glass etc.) are mixed uniformly, and the surface of a steel material is coated with the mixture to thickness of above 2mg/cm<2>. The surface of this coated layer is covered with the mixture composed of 10-50 weight parts metallic powder selected from Al, Cr, Ti, Mn, Cu, Ni, Co, Mg, Fe, 50-30 weight parts of the oxide powder of the above described metals 10-100 weight parts silicic acid anhydride, powder of refractory of kaolin, montmorillonite, dolomite group, 20-80 weight parts of the water glass, proper quantity of water to the thickness of above 5mg/cm<2>. The generation of the scales is suppressed when heating the steel material, and the stripping property of the scales can be improved. |
