Year 10 Manufacturing (Resistant Materials)
Lesson 4 Week 4 (Clock Project)
Non-Ferrous Metals Chooser Chart Name Composition Properties Uses Aluminium Pure Metal Greyish-White, soft, malleable, conductive to heat and electricity, It is corrosion resistant. It can be welded but this is difficult. Needs special processes. Aircraft, boats, window frames, saucepans, packaging and insulation, pistons and cranks. Aluminium alloys-
Aluminium +4% Copper+1%Manganese
Ductile, Malleable, Work Hardens. Aircraft and vehicle parts. Copper Pure metal Red, tough, ductile, High electrical conductor, corrosion resistant, Can work hard or cold. Needs frequent annealing. Electrical wire, cables and conductors, water and central heating pipes and cylinders. Printed circuit boards, roofs. Brass 65% copper +35%zinc. Very corrosive, yellow in colour, tarnishes very easily. Harder than copper. Good electrical conductor. Castings, ornaments, valves,forgings. Lead Pure metal The heaviest common metal. Soft, malleable, bright and shiny when new but quickly oxidizes to a dull grey. Resistant to corrosion. Protection against X-Ray machines. Paints, roof coverings, flashings. Zinc Pure metal A layer of oxide protects it from corrosion, bluish-white, easily worked. Makes brass. Coating for steel galvanized corrugated iron roofing, tanks, buckets, rust-proof paints Tin Pure metal White and soft, corrosion resistant. Tinplate, making bronze. Gilding metal 85% copper+15% zinc. Corrosion resistant, golden colour, enamels well. Beaten metalwork, jewellery.
Ferrous Metals Chooser Chart Name Composition Properties Uses Mild Steel 0.15 to0.30% carbon Tough, high tensile strength, ductile. Because of low carbon content it can not be hardened and tempered. It must be case hardened. girders, Plates, nuts and bolts, general purpose. High Speed Steel medium carbon, tungsten, chromium and vanadium. Can be hardened and tempered. Can be brittle. Retains hardness at high temperatures. Cutting tools for lathes. Stainless Steel 18% chromium, and 8% nickel added. Corrosion resistant Kitchen draining boards. Pipes, cutlery, aircraft. High Tensile Steel Low carbon steel,, nickel,and chromium. Very strong and very tough. Gears, shafts, engine parts. High Carbon Steel 0.70% to 1.40% carbon. The hardest of the carbon steels. Less ductile, tough and malleable. Chisels, hammers, drills, files, lathe tools, taps and dies. Medium Carbon Steels 0.30% to 0.70% carbon. Stronger and harder than mild steels. Less ductile, tough and malleable. Metal ropes, wire, garden tools, springs. Cast Iron Remelted pig iron with small amounts of scrap steel. Hard, brittle, strong, cheap, self-lubricating.
Whitecast iron, grey cast iron, malleable cast iron.
Heavy crushing machinery. Car cylinder blocks, vices, machine tool parts, brake drums, machine handle and gear wheels, plumbing fitments.