Bought where high strength and very good machinability are needed together, for parts that will not be welded and that will be protected by plating or paint: hydraulic manifolds, screw machine parts, fasteners and rivets, machine components, aerospace and defence parts.<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 tube \u00b7 forgings. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 4118<\/b> (2017-T4 and 2017-T451 rolled or cold finished bars, rods and wire) \u00b7 EN 573-3 (chemical composition) \u00b7 EN 573-1 and EN 573-2 (designation) \u00b7 EN 515 (temper designations) \u00b7 EN 485-1\/-2\/-3\/-4 (flat products) \u00b7 EN 755-1\/-2 (extruded rod, bar, tube and profiles) \u00b7 EN 754-1\/-2 (cold drawn rod, bar and tube) \u00b7 EN 586-1\/-2\/-3 (forgings) \u00b7 EN 1301-2 (wire)
AMS 4118 was verified against the SAE title record and covers 2017-T4 \/ T451 bar, rod and wire; but the text names the alloy ‘2017’, not ‘2017A’.<\/span><\/div>\n<\/div>\n\n
Advantage<\/div>\n
It reaches high strength by NATURAL ageing alone, that is, without an artificial ageing furnace step: EN 755-2 requires Rp0.2 min 260 MPa and Rm min 380 MPa for T4 extruded rod up to 25 mm diameter.<\/div>\n<\/div>\n
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Welding<\/div>\n
NOT SUITABLE FOR FUSION WELDING. Producer data sheets rate gas, TIG and MIG welding as unsuitable (5 on the BIKAR scale); Euralliage calls gas welding ‘strongly inadvisable’ and arc welding ‘not recommended’.<\/div>\n<\/div>\n
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Limits<\/div>\n
There are two governing limits. THE FIRST IS CORROSION: copper sits at 3.5-4.5 % and the cathodic Al2Cu particles on the grain boundaries start galvanic attack. Producer data sheets rate normal atmosphere 4 (poor) and seawater 4-5 (poor to unsuitable); Euralliage explicitly does not recommend seawater exposure.<\/div>\n<\/div>\n