Guide to Metal Selection

Application
No. 		Main Group Requirements/Service Conditions Casting Examples
1 General Engineering Good & consistent machinability Repetition machining of small components with section to 3mm
2 General Engineering Impact strength Machine parts, housings, couplings, levers
3 General Engineering High fluid pressure Pump bodies, cylinders, valves, pistons, pipes
4 General Engineering Vibratory stresses Machine tool parts, gears, crankshafts, bedplates, machine frames
5 General Engineering Dimensional stability Gauges, jigs, machine tool parts, gears
6 General Engineering Stresses at temps up to 450² C Superheated steam headers, cylinder heads, turbine parts, supports, brackets
7 Heat Intermittent heat, thermal cycling & thermal shock Ingot moulds, slag pots, siphon pipes, brake rotors, clutch plates
8 Heat Continuous heat up to 620² C Oil refinery baffle plates & bubble caps, stoker links, melting pots, die casting parts
9 Heat Continuous heat up to 750² C Furnace parts, melting pots, fusion pots, retorts, tube supports
10 Heat Scaling & growth up to 900² C Furnace parts, annealing boxes and trays, carburising boxes, grates, skid bars
11 Heat Heat with corrosive attack by acids & alkalis Stills, retorts, fusion pots, salt bath pots
12 Heat Heat + abrasive wear Rabble arms, mill guides, furnace rails, clinker chutes
13 Wear Lubricated wear Machine tool slides, cylinder liners, gears, pistons, cams
14 Wear Abrasive wear Ash & gravel pipes, rolls & rollers, car wheels, wire drawing drums
15 Wear Heavy abrasion with shock Mill liners, crusher segments & jaws, pulverisers, stamp mill parts, stamp dies
16 Wear Wear with development of heat Brake rotors, clutch plates
17 Wear Erosion from solids carried in liquids Slurry pump parts, gravel pipes, ash sluices
18 Corrosion Contact dilute acids & chem (pH less than 2.0) Evaporators, pumps, valves, vacuum pans, filters
19 Corrosion Contact with conc sulphuric acid (greater than 75% H2SO4) Pipes, pumps, convertors, still bodies, storage vessels, fittings
20 Corrosion Contact with conc alkalis (pH greater than 7.0) Carbonators, causticisers, valves, pumps, pipes & fittings, pots





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