| 摘要 |
PURPOSE:To suppress the generation of oxide inclusions which are the cause for the defects of steel products by coating a coating material consisting of limestone, dolomite and binder on the surface of the lining refractories of a vacuum degassing device. CONSTITUTION:The coating material prepd. by adding 0.1-20 outer wt% binder to 100wt% 1 or 2 kinds of limestone and dolomite is coated to about 5-50mm thickness by spraying, etc. onto the surface of the lining refractories (magnesite- chrome brick, etc.) of the degassing device. >=1 kinds of inorg. compd. or inorg. salt (sodium hexamethaphosphate, potassium silicate, etc.) of an alkali metal, halogenide compd. (magnesium chloride, etc.) are used for the binder and the coating material is preferably preheated to about >=1,000 deg.C. The crystal size of the CaO and MgO formed from such coating material is about <=10mu and is not the cause for a defective steel product. |
