Patent ID: 8562764

Claim:
A copper alloy tube for a heat exchanger, comprising: Sn 0.1 to 2.0 mass %, P 0.005 to 0.1 mass %, S 0.005 mass % or less, O 0.005 mass % or less, and H 0.0002 mass % or less; and the remainder has a composition consisting essentially of Cu and unavoidable impurities, wherein the copper alloy tube has, as is annealed, the following characteristics: a tensile strength in the longitudinal direction of the copper alloy tube is 250 N/mm 2 or more; an average grain diameter is 30 μm or less when measured in the direction perpendicular to the thickness direction of the tube, in the cross section perpendicular to the tube axis; and σT/σL>0.93, where σL is the tensile strength in the longitudinal direction of the copper alloy tube and σT is the tensile strength in the circumferential direction of the same copper alloy tube.