LUBRICANT COMPOSITION FOR SEAMLESS STEEL PIPE WORKING

摘要

A lubricant composition for seamless steel pipe working that without detriment to non-carburization properties and surpassing lubricity for hard-to-work materials such as 13-chrome steel and stainless steel, comprehensively satisfies requirements for properties such as storage stability, transferability in apparatus piping, sprayability to lubrication sites and uniform adherence to high-temperature mandrel bar. There is provided a lubricant composition whose viscosity characteristics are represented by the approximate expression: Y=a.X wherein Y: viscosity (mPa.s), X: shear rate (s<-1>), and during stationary storage, a: 4,000 to 40,000 and b: -1.0 to -0.3 while 90 sec after shear termination, a: 1,000 to 20,000 and b: -1.0 to -0.15.