COPPER ALLOY TUBE FOR HEAT EXCHANGER EXCELLENT IN FRACTURE STRENGTH

摘要

COPPER ALLOY TUBE FOR HEAT EXCHANGER EXCELLENT IN FRACTURE STRENGTH THE PRESENT INVENTION PROVIDES A COPPER ALLOY TUBE FOR 5 HEAT EXCHANGERS WHICH IS TOLERABLE TO A HIGH OPERATING PRESSURE OF NEW COOLING MEDIA SUCH AS CARBON DIOXIDE AND HFC-BASED FLUOROCARBONS, AND IS EXCELLENT IN FRACTURE STRENGTH, EVEN IF THE TUBE IS THINNED, AND A COPPER ALLOY TUBE FOR A HEAT EXCHANGER WHICH HAS A COMPOSITION HAVING SPECIFIED AMOUNTS OF SN AND P, 10 HAS AN AVERAGE CRYSTAL GRAIN SIZE OF 30 @IM OR LESS AND HAS A HIGH STRENGTH OF 250 MPA OR MORE OF A TENSILE STRENGTH IN THE LONGITUDINAL DIRECTION OF THE TUBE IMPROVES THE FRACTURE STRENGTH AS A TEXTURE IN WHICH THE ORIENTATION DISTRIBUTION DENSITY IN THE GOSS ORIENTATION IS 4OR LESS.