LUBRICANT FOR HOT WORKING AND PROCESS FOR MANUFACTURING SEAMLESS STEEL PIPE

摘要

A lubricant for hot plastic working which contains 20 to 40 mass% of iron oxide and 10 to 30mass% of sodium silicate and has an impurity content of 3mass% or below and which further contains 40 to 60mass% of water. The lubricant exhibits excellent lubricity and supply characteristics and dose not adversely affect the corrosion resistance of articles by virtue of combined action of the components. The lubricant is suitable for lubricating a guide shoe in piercing rolling high-Cr steel and exerts the great effect of inhibiting the outer surface of an article from seizure when applied directly to the outer surface of a workpiece just before piercing rolling, preferably, within one second before the initiation of piercing rolling.