Patent ID: 11946127
Assignee: DOWA METALTECH CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 8:
9. A method for producing the copper alloy sheet material according to claim 1, comprising a step of producing the copper alloy sheet material by subjecting an intermediate product sheet material having a composition comprising, in mass %, Ti: 1.0 to 5.0%, Al: 0.5 to 3.0%, Ag: 0 to 0.3%, B: 0 to 0.3%, Be: 0 to 0.15%, Co: 0 to 1.0%, Cr: 0 to 1.0%, Fe: 0 to 1.0%, Mg: 0 to 0.5%, Mn: 0 to 1.5%, Nb: 0 to 0.5%, Ni: 0 to 1.0%, P: 0 to 0.2%, Si: 0 to 0.5%, Sn: 0 to 1.5%, V: 0 to 1.0%, Zn: 0 to 2.0%, Zr: 0 to 1.0%, and S: 0 to 0.2%, the total content of Ag, B, Be, Co, Cr, Fe, Mg, Mn, Nb, Ni, P, Si, Sn, V, Zn, Zr, and S among the elements being 3.0% or less, and the balance of Cu, with unavoidable impurities, to a first solution treatment, first intermediate cold rolling, a second solution treatment, second intermediate cold rolling, and an aging treatment in this order, wherein
the first solution treatment is performed under the condition of holding in a temperature range of 750 to 950° C. for 10 to 600 seconds,
the first intermediate cold rolling is performed at a rolling ratio of 70% or more,
the second solution treatment is performed under the condition of holding in a temperature range of 750 to 900° C. for 10 to 600 seconds,
the second intermediate cold rolling is performed at a rolling ratio of 15 to 50%, and
the aging treatment is performed at an aging temperature of 300 to 470° C.