seamless pipe, level-wound coils and cross-fin tube type heat exchanger and a method of manufacturing the same

摘要

a seamless pipe for the heat transfer tubes of the cross fin tube type heat exchanger The material of eyes-free tube, either as from 0.01 to 0.06 wt% of Fe or 0.04 to 0.06 wt% of Ni, and P of 0.004 to 0.040 wt%, the is contained, it is a copper alloy of the balance Cu and incidental impurities, the ratio of wall thickness to the outer diameter (mm) of th free tube (mm) (t / D) is 0.04 or less, eyes Mukan of tensile strength ( B) is at 245MPa or more, the 0.2% yield strength ( 0.2) is not more than 130MPa, seamless pipe elongation ( ) is characterized by, that is 40% or more. According to the present invention, it is possible to provide a seamless pipe which can high strength and performs hairpin bend correctly.