Eighteen alloys were tested in hot ammonia atmospheres over long periods of time and results compared. Specific comparison was made of tests made in an ammonia converter and in a chemical plant ammonia line. Materials tested include 11 steels, 37 Ni/20 Cr, 60 Ni/15 Cr, 80 Ni/20 Cr, Inconel, Monel and 99.49 percent pure nickel. It was found that in several ammonia-bearing atmospheres of widely-varying nitride potential, the nickel-base alloys in the iron-nickel-chromium system were substantially more resistant to attack by nitrogen than those alloys richer in iron and chromium. 4.3.3, 6.3.10
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Moran et al. (1961) studied this question.
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