| 摘要 |
PURPOSE:To provide a lubricant applied between the working tool such as plug, guide shoe, etc., for the hot-working of seamless steel pipe and the material to be worked, e.g. raw pipe, etc., by mixing powdery iron oxide and a silicic acid compound at a specific ratio. CONSTITUTION:The objective lubricant is composed of (A) 10-80(wt)% iron oxide powder (most preferably red oxide) containing <=1% particles larger than 325 mesh and (B) 20-90% silicic acid compound (e.g. a slat of a silicic acid dioxide and a metal oxide such as sodium metasilicate, sodium orthosilicate, etc., a concentrated aqueous solution of an alkali silicate glass such as water glass, a colloidal silica such as an aqueous dispersion of ultrafine silica powder, an aluminosilicate such as mica, a phyllosilicate, etc.). In some cases, it is preferable to add an alkylene (co)polymer to the lubricant. |
