Wrought machinable brass alloy
A wrought machinable low copper, silicon, zinc alloy having a copper content between about 66 weight percent and about 70 weight percent and wherein the silicon content is between about 1.3 weight percent and about 2.0 weight percent.
1. A wrought machinable, dezincification-resistant, low lead, low copper, silicon, zinc alloy consisting of between about 66 weight percent and 69 weight percent copper; greater than 1.53 weight percent and less than 2 weight percent silicon wherein the silicon content further satisfies the equation 0.167*Cu−9.28>Si>0.132*Cu−7.66; up to about 0.25 weight percent lead; up to about 0.15 weight percent phosphorus; up to about 0.5 weight percent iron; up to about 1.2 weight percent tin; up to about 2.5 weight percent aluminum; up to about 0.25 weight percent nickel; up to about 0.25 weight percent cobalt; up to about 0.15 weight percent arsenic; up to about 0.15 weight percent antimony; up to about 0.25 weight percent bismuth; up to about 0.25 weight percent selenium; up to 0.25 weight percent sulfur; and the balance zinc and unavoidable impurities, wherein the alloy has been worked and heated sufficiently to produce a microstructure with a corrosion penetration ≤200 μm tested according to ISO 6509 Protocol.
2. The wrought machinable low lead, low copper, silicon, zinc alloy according to claim 1 wherein the alloy has corrosion penetration ≤100 μm tested according to ISO 6509 Protocol.
3. The wrought machinable low lead, low copper, silicon, zinc alloy according to claim 1 wherein the microstructure comprises alpha phase and non-alpha phases in an amount such that the elongation is greater than about 8% and less than about 47% as determined according to ASTM E8.
4. The wrought machinable low lead, low copper, silicon, zinc alloy according to claim 1 , wherein the alloy has a microstructure comprising a majority of alpha phase, with between about 3 volume percent and about 45 volume percent non-alpha phase.
5. The wrought machinable low lead, low copper, silicon, zinc alloy according to claim 1 , wherein the chips resulting from the machining of the alloy break readily into small pieces conducive to high speed machining.
6. A wrought machinable, dezincification-resistant, low lead, low copper, silicon, zinc alloy consisting of between about 66 weight percent and 69 weight percent copper, greater than 1.53 weight percent and less than 2 weight percent silicon wherein the silicon content further satisfies the equation 0.167*Cu−9.28>Si>0.132*Cu−7.66; up to about 0.25 lead; up to about 0.15 weight percent phosphorus; up to about 0.5 weight percent iron; up to about 1.2 weight percent tin; up to about 2.5 weight percent aluminum; and up to about 0.25 weight percent nickel; up to about 0.25 weight percent cobalt; up to about 0.15 weight percent arsenic; up to about 0.15 weight percent antimony; up to about 0.25 weight percent bismuth; up to about 0.25 weight percent selenium; up to 0.25 weight percent sulfur; and the balance zinc and unavoidable impurities; the alloy worked and heated sufficiently to produce a microstructure comprising a majority of alpha phase, with between about 3 volume percent and about 45 volume percent non-alpha phase, such that the elongation is greater than about 8% and less than about 47% as determined according to ASTM E8, and a corrosion penetration ≤200 μm tested according to ISO 6509 Protocol.