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Slide 42 of 69
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The cold work in the case of extruded products such as rods, bars, sections, tubes and wire, is applied by drawing through reducing dies.
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Progressive amounts of cold working increase the tensile strength, proof strength and hardness of the alloy, with a consequent reduction in ductility, as measured by elongation. Material available from manufacturers will have been subjected to various amounts of cold reduction; temper grades covered by British Standards for sheet, strip and wire are 1/4 hard, 1/2 hard, hard, extra hard, spring hard and extra spring hard. Not all brasses or forms are available in all temper conditions.