COPPER ALLOY SHEET, ELECTRONIC COMPONENT FOR HEAVY-CURRENT AND ELECTRONIC COMPONENT FOR HEAT RELEASE CONTAINING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a copper alloy having high strength, high conductivity and excellent processability.SOLUTION: The copper alloy sheet contains one or two kind of Zr and Ti of total 0.01 to 0.50 mass% and the balance copper with inevitable impurities and has conductivity of 70% IACS or more, 0.2% bearing force of 350 MPa or more, MBR/t≤2.0 or less by W flexure test and a sheet thickness anisotropy of 1.2 or more defined by (r+r+2×r)/4, where r, rand rare Lankford values of each direction of rolling parallel, right angle and 45°.