Copper-zinc-nickel-manganese alloy
AssigneeWieland-Werke AG
InventorIgor Altenberger
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Abstract
A copper alloy having the following composition (in % by weight) Zn: 17 to 20.5%, Ni: 17 to 23%, Mn: 8 to 11.5%, optionally up to 4% Cr, optionally up to 5.5% Fe, optionally up to 0.5% Ti, optionally up to 0.15% B, optionally up to 0.1% Ca, optionally up to 1.0% Pb, balance copper and unavoidable impurities, wherein the proportion of copper is at least 45% by weight. Further, the ratio of the proportion of Ni to the proportion of Mn is at least 1.7 and the alloy has a microstructure which has inclusions of MnNi and MnNh precipitates.
Claims9
A wrought material of a copper alloy having a composition (in % by weight) consisting of:
- Zn:
- from 17 to 20.5%,
- Ni:
- from 17 to 23%,
- Mn:
- from 8 to 11.5%,
- up to 4% of Cr,
- up to 5.5% of Fe,
- up to 0.5% of Ti,
- up to 0.15% of B,
- up to 0.1% of Ca,
- up to 1.0% of Pb,
- the balance being copper and unavoidable impurities,
- wherein the proportion of copper is at least 45% by weight, the ratio of the proportion of Ni to the proportion of Mn is at least 1.7 and the alloy has a microstructure in which precipitates of the type MnNi and MnNi2 are embedded,
- wherein the wrought material has a tensile strength of at least 1100 MPa and is obtained by hot forming in a temperature range between 650° C. and 850° C., cold forming, and heat treatment of 2 to 30 hours in a temperature range between 310° C. and 370° C.
A wrought material made of a copper alloy having a composition (in % by weight) consisting of:
- Zn:
- from 17 to 20.5%,
- Ni:
- from 17 to 23%,
- Mn:
- from 8 to 11.5%,
- up to 4% of Cr,
- up to 5.5% of Fe,
- up to 0.5% of Ti,
- up to 0.15% of B,
- up to 0.1% of Ca,
- up to 1.0% of Pb,
- the balance being copper and unavoidable impurities,
- wherein the proportion of copper is at least 45% by weight, the ratio of the proportion of Ni to the proportion of Mn is at least 1.7 and the wrought material has a microstructure in which precipitates of the type MnNi and MnNi2 are embedded,
- wherein the wrought material has an elongation of break of at least 30% and is obtained by hot forming in a temperature range between 650° C. and 850° C., cold forming, and a heat treatment at a temperature above 450° C. and a duration of heat treatment below one hour.
A wrought material made of a copper alloy having a composition (in % by weight) consisting of:
- Zn:
- from 17 to 20.5%,
- Ni:
- from 17 to 23%,
- Mn:
- from 8 to 11.5%,
- up to 4% of Cr,
- up to 5.5% of Fe,
- up to 0.5% of Ti,
- up to 0.15% of B,
- up to 0.1% of Ca,
- up to 1.0% of Pb,
- the balance being copper and unavoidable impurities,
- wherein the proportion of copper is at least 45% by weight, the ratio of the proportion of Ni to the proportion of Mn is at least 1.7 and the wrought material has a microstructure in which precipitates of the type MnNi and MnNi2 are embedded,
- wherein the wrought material has a tensile strength of at least 850 MPa and an elongation of break of at least 3% and is obtained by casting, cold forming of the cast state without any hot forming, and a heat treatment of 10 minutes to 30 hours in a temperature range between 310° C. and 500° C., the cold forming having a total degree of deforming of at least 80%.
Dependencies are inferred from the claim text.