Grubb, John F. ATI Allegheny Ludlum, Natrona Heights, Pennsylvania.
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The name used for the group of iron-base alloys that have more than 10% by weight of chromium and that exhibit phenomenal resistance to rusting and corrosion. The metallic element chromium (Cr) has been used in small amounts to strengthen steel since the second half of the nineteenth century; but only in the early twentieth century was it discovered that contents with chromium exceeding 10%, with carbon (C) held suitably low, make iron effectively rustproof. Onset of the property is striking (Fig. 1), and the chromium can then be increased to over 30% with even further chemical advantages before the metal becomes structurally useless. See also: Alloy; Steel
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