LUBRICANT FOR STEEL PIPE COLD WORKING AND RELEVANT METHOD OF COLD WORKING.

摘要

[PROBLEMS] To provide a lubricant that not only facilitates forming of a coating on a surface of steel pipe prior to cold working but also exhibits a high load reducing effect during steel pipe cold working, and that facilitates washing away of the lubricant from the surface of steel pipe after the cold working, and provide a relevant method of cold working. [MEANS FOR SOLVING PROBLEMS] An alkali soap is used as a lubricant for steel pipe cold working. A surface to be worked of steel pipe is coated with an aqueous solution of alkali soap or a hydrous pasty alkali soap. Thereafter, the steel pipe is cold worked, and, after the cold working, the alkali soap coating is removed by water washing. The aqueous solution of alkali soap or hydrous pasty alkali soap is preferably prepared in a vessel with an internal surface of nonmetallic substance.