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By Dr. Gordon J. Cox, reprinted from American Foundrymen's Society Transactions 1989. It is suggested that the development and use of the nickel-chromium Ni-Hard irons has been neglected in recent years in favor of high-chromium irons mainly because the latter have been made with a high hardness and better fracture resistance. New work is outlined in which it has been shown that both Ni-Hard 1 and 4 can be produced with high hardness values of at least 700 Brinell and an associated excellent abrasion resistance. Both general classes of these abrasion-resistant white irons have their best respective fields of application, but it is suggested that the benefits obtained from using nickel-bearing irons need now be reassessed.

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