HOT ROLLING METHOD OF TUBE STOCK FOR SEAMLESS STEEL TUBE

摘要

PURPOSE:To restrain the wear and surface roughening of caliber roll by continuously spraying the lubricant between a caliber roll of which the hardness is =60 in Shore hardness as the caliber roll of a mandrel mill and a tube stock from the inlet side of stand and also rolling the tube stock while spraying cooling water to the caliber roll. CONSTITUTION:A high-chronium system cast steel roll which is =60 in Shore hardness is used as the caliber roll and spraying nozzles 2 for lubricant is arranged in inside part on the inlet side of rolling of the caliber roll 1 and spraying nozzles 3 for cooling water are arranged over the whole part of the outlet side of rolling from the outside part on the inlet side of rolling of the caliber roll 1, while a water-soluble lubricant is sprayed between the caliber roll 1 and the hollow tube stock 4 from the spraying nozzles 2 for lubricant and also cooling water is sprayed from the spraying nozzles 3 for cooling water to the caliber roll 1, the hollow tube stock 4 is rolled.