Following is a list of physical and


mechanical properties common to cast copper alloys (note: not every property is applicable to every alloy):


• Good corrosion resistance, which contributes to its durability in aggressive environments and long-term cost-effectiveness.


• Favorable mechanical properties ranging from pure copper, which is soft and ductile, to manganese- bronze, which rivals the me- chanical properties of quenched and tempered steel. In addition, almost all copper alloys retain their mechanical properties at low temperatures.


Fig. 2. This 9.82-lb. brass steering linkage for a pallet truck was converted from a weldment with 10 pre-fabricated pieces, 19 weld joints and four bushings.


Table 1. Properties and Applications of Cast Copper-Base Alloys Alloy Family


UNS Numbers Coppers High Copper Red Brass Semi-Red Brass Yellow Brass


Copper-Bismuth & SeBiLOY


Silicon Bronze & Silicon Brass


Tin Bronze


Leaded and High- Leaded Tin Bronze


Properties


C80100 to C81200 soft, ductile, high electrical and thermal conductivity, good corrosion resistance, moderate strength


C81400 to C82800 unique combination of high strength and thermal and electrical conductivity, high hardness, wear and fatigue resistance, corrosion resistance


C83300 to C83810 high aqueous and atmospheric corrosion resistance, moderate strength and electrical conductivity


C84200 to C84800 moderate corrosion resistance and strength


C85200 to C85800 pleasant yellow color, easily polished, lower corrosion resistance


C89320 to C89940 lubricity, good machinability without lead, meets potable water standards


Manganese ronze C86100 to C86800 high strength (as cast), good wear resistance, moderate corrosion resistance


C87300 to C87800 moderate strength, high corrosion resistance, low melting point


C90200 to C91700 good corrosion resistance, ductility and wear resistance, reasonable strength, low friction coefficient vs. steel


C92200 to C94500 improved machinability and pressure tightness relative to tin bronzes, improved lubricity


Nickel-Tin Bronze C94700 to C94900 moderate strength, good corrosion and wear resistance components, machinery parts, motion translation devices


Aluminum Bronze C95200 to C95900 high strength, good corrosion, erosion-corrosion and cavitation resistance, good galling resistance


Copper-Nickels C96200 to C96950 excellent seawater corrosion resistance, bio-fouling resistance, stress corrosion cracking resistance in ammonia, high strength


Nickel Silvers


C97300 to 97800 good aqueous corrosion resistance, high castability, moderate strength, pleasant silver luster


Leaded Coppers C98200 to C98840 corrosion resistance of copper with favorable lubricity and low friction, high conductivity


Special Alloys- Incramet 800


good thermal conductivity, oxidation resistance and thermal fatigue resistance, high hot hardness


30 | METAL CASTING DESIGN & PURCHASING | Mar/Apr 2015


• High thermal and electrical con- ductivity greater than any metal


Applications electrical connectors, hot metal handling


electrical contacts, clamps, welding gear, bearings, molds for plastics


valves, pumps, plumbing and boat hardware, pipe fittings, terminal ends for electric cables


low-pressure water valves, plumbing, hardware, pipe fittings, faucets


decorative hardware, architectural trim, plumbing fixtures, bushings, fittings


bearings and bushings, plumbing fixtures, valves and fittings for potable water, food processing


gears, bolts, valve stems, marine fittings, propellers


bearings, gears, valve stems, intricate pump and valve components, boat propellers


bearings, piston rings, seal rings, valve fittings, gears, hydraulic and high-pressure steam parts, bells


similar to tin bronzes plus sleeve bearings bearings, gears, nozzles, wear guides, valve and pump


propellers, pump impellers, pump and valve parts, bearings, wear rings, marine hardware, pickling hooks and baskets


marine equipment including pump components, impellers, valves, ship tailshaft sleeves, pipes, pipe fittings


valves, fittings, hardware for food and beverage handling, seals and labyrinth rings in steam turbines, architectural trim, musical instrument valves


auto main and connecting rod bearings


glassmaking molds, plate glass rolls, marine hardware


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