초록 ▼

The present invention provides a lubricant composition for hot metal working which is capable of inhibiting generation of flaws on the surface of materials to be provided for hot metal working, and provides a method of hot metal working. The invention provides a lubricant composition for hot metal w

The present invention provides a lubricant composition for hot metal working which is capable of inhibiting generation of flaws on the surface of materials to be provided for hot metal working, and provides a method of hot metal working. The invention provides a lubricant composition for hot metal working comprising a plurality of glass frits respectively having different softening point from each other.

대표청구항 ▼

1. A lubricant composition for hot metal working of a billet by piercing-rolling mill, the lubricant composition comprising: (1) water;(2) a first glass frit having viscosity of 103 to 106 dPa·s at 1200° C. and containing 60 to 70 mass % of SiO2, 5 to 20 mass % of Al2O3, 0 to 20 mass % of CaO;(3) a

1. A lubricant composition for hot metal working of a billet by piercing-rolling mill, the lubricant composition comprising: (1) water;(2) a first glass frit having viscosity of 103 to 106 dPa·s at 1200° C. and containing 60 to 70 mass % of SiO2, 5 to 20 mass % of Al2O3, 0 to 20 mass % of CaO;(3) a second glass frit having viscosity of 103 to 106 dPa·s at 700° C. and containing 40 to 60 mass % of SiO2, 0 to 10 mass % of Al2O3, 20 to 40 mass % B2O3, 0 to 10 mass % of ZnO, 5 to 15 mass % of Na2O;(4) an anti-slipping agent comprising alumina or silica to increase a friction coefficient between the billet and a roll of the piercing-rolling mill;(5) a dispersion-suspension agent to dispersively suspend a solid component including the glass frit and the anti-slipping agent in the water wherein said first and second glass frits respectively have different softening points from each other. 2. The lubricant composition according to claim 1, wherein the dispersion-suspension agent comprises clay or bentonite. 3. A method for producing seamless pipe, the method comprising steps of: providing a billet;coating, onto the surface of the billet, the lubricant composition according to claim 1;heating the billet after coating the lubricant composition;producing a hollow shell by piercing-rolling of the billet; anddrawing-rolling and sizing the hollow shell.