| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hot-rolling lubricant good in workability and excellent in seizure resistance and to provide a method for surface-treating a mandrel bar for the production of hot-rolled seamless pipes using the lubricant. <P>SOLUTION: A hot rolling tool lubricant prepared by dispersing or dissolving an oxide-type layered compound such as potassium tetrasilicon mica, sodium tetrasilicon mica, vermiculite, or bentonite, a boric acid compound such as boric acid, potassium borate, or sodium borate, and graphite in water, wherein the mixing ratio of the oxide-type layered compound to the boric acid compound is 10:90 to 70:30 by mass ratio, and the content of the graphite is 1.0-4.5%. When the lubricant is applied to the surface of a mandrel bar during mandrel mill drawing, the lubricant forms a lubricating film on the bar surface and can exhibit excellent seizure resistance. In addition, it does not happen that the lubricant remains on the inside pipe surface. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
