SEAMLESS TUBE, COIL, LEVEL WOUND COIL, METHOD FOR MANUFACTURING LEVEL WOUND COIL, CROSS-FIN-TUBE-TYPE HEAT EXCHANGER, AND METHOD FOR MANUFACTURING CROSS-FIN-TUBE-TYPE HEAT EXCHANGER

摘要

A seamless tube for a heat transfer tube for a cross-fin-tube-type heat exchanger, which is characterized in that the material for the seamless tube is phosphorus deoxidized copper, the ratio of the thickness (mm) of the seamless tube to the outer diameter (mm) of the seamless tube (i.e., t/D) is 0.040 or less, and the seamless tube has a tensile strength (sB) of 245 MPa or more, a 0.2% offset yield strength (s0.2) of 140 MPa or less and an elongation (d) of 40% or more. It becomes possible to provide a seamless tube made of phosphorus deoxidized copper, which has high strength and can be bent in a hairpin shape in a normal manner.