| 简介 |
PROBLEM TO BE SOLVED : To provide a copper sheet having small planar anisotropy of an r value and low contents of C and Mn.SOLUTION : There is provided a copper sheet having a chemical composition containing, by mass%, C : 0.04 to 0.25%, Mn : 0.60 to 1.5%, one or two kind of Si : 0.05 to 0.50% and sol.Al : 0.005 to 0.080% and Cr : 0.02 to 1.50%, having mechanical properties including ▵r1 defined by the formula (1) of -0.20 to 0.20, ▵r2 defied by the following formula (2) of 0.42 or less and yield stress in a rolling direction YP of 210 to 260 MPa and manufactured by hot rolled sheet firing, cold rolling and finish firing under specific conditions. Δr1=(r-2r+r)/2 (1), Δr2=r-r(2), where r, rand rare each r value measured on test pieces collected in parallel, 45° and vertical direction and rand rare maximum value and minimum value of r, rand rrespectively. |
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