METHOD OF MANUFACTURING BENT PIPE OF HIGH TENSILE STEEL.

摘要

A method of manufacturing a bent pipe, in which a straight pipe of high tensile steel consisting of low alloy steel containing 0.08 percent weight of C or lower or a straight clad pipe composed of said low alloy steel at the outer part and high anti-corrosive alloy at the inner part is heated to a temperature not lower than Ac3 point of the low alloy steel, bent at said temperature, hardened starting at the above temperature immediately after bent, and tempered at a temperature ranging from 250 to 500 DEG C, thereby being turned into a final product.