Copper-Nickel Alloys
Complete solubility arises between nickel and copper. All alloys have same microstructure and may be cold or hot worked.
Cupro-nickel also termed as German silver is extremely ductile and malleable. This is good against corrosion because of salt water. Condenser tubes are major parts made out of this alloy. This is also employed for coinage. 75/25, 80/20 and 70/30 alloys are very usual.
Monel metal is essentially 70 percent Nickel and 30% Cu along with minute amounts of iron and other elements. Alloy is well identified for its corrosion resistance and high strength. This alloy is largely employed for chemical and food processing plants. This also finds great employ as turbine blades, screws, nails and valves corrosion resistance bolts. This is known for its individuality silver luster.
Table 19 and 20 respectively illustrates Brasses and Bronzes along with their applications.
Table no.19: Composition, Properties and Applications of Brasses
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Gliding metal (95 Cu, 5 Zn)
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High ductility and corrosion resistance, coins, medals, gold platings
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Red brass (85 Cu, 15 Zn)
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Good corrosion resistance, workability, heat exchanger tube, radiator cores
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Cartridge brass (70 Cu, 30 Zn)
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Good strength and ductility, rivets, springs, automotive radiator cores
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Yellow brass (65 Cu, 35 Zn)
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Screws, rivets reflectors, plumbing accessories, automotive radiator cores
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Muntz metal (60 Cu, 40 Zn)
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Soundness and good machinability, condenser tubes, architectural work
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Leaded red brass (85 Cu, 5 Zn, 5 Sn, 5
Pb)
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Fair strength, soundness and good machining in cast state, pressure valves, pipe fittings, pump fittings
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Leaded commercial bronze
(89 Cu, 9.25 Zn, 1.75 Pb)
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Screws, screw machine parts, electrical connectors, builder's applications
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Admiralty brass (71 Cu, 28 Zn, 1 Sn)
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Condenser, evaporator and heat exchanger tubes, marine applications
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High leaded brass (64 Cu, 33 Zn, 2 Pb)
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Flat products, gears, wheels
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Table no.20: Composition and Applications of a Few Bronzes
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Phosphor bronze (94.8 Cu, 5 Sn, 0.2 P)
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Bolts, electric contracts, spring, bearing
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Phosphor bronze (89.8 Cu, 10 Sn, 0.2 P)
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Such applications where high strength and
resistance to salt water is desired, bushing and gears
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Gun metal (88 Cu, 10 Sn, 2 Zn)
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Sand cast, sued under heavy pressure such as gears and bearings
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Aluminium bronze
(88 Cu, 10.5 Al, 3.5 Fe )
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High UTS
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Beryllium bronze (98 Cu, 1.7 Be, 0.3
Co)
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Very high mechanical strength, springs, used against fatigue, wear and corrosion
(UTS - 1200 MPa)
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