Stainless chrome-manganese-nickel-nitrogen steel with titanium, niobium, and molybdenum additions
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Cr-Mn-Ni-N steel (of the Kh17N4AG8 type) exhibits a tendency to intercrystalline corrosion within the temperature range of 450 to 800°C. It is therefore unsuitable for service under the above temperature conditions.
Carbon, nitrogen, nickel, and manganese — all austenitizing elements — have an adverse effect on the resistance to intercrystalline corrosion.
Niobium and titanium enhance the resistance of this type of steel to intercrystalline corrosion. However, in employing these elements the amount of such austenitizing agents as nitrogen, for instance, has to be increased to prevent the formation of δ-ferrite that lowers the resistance to intercrystalline attack, the stabilization of this steel by niobium and titanium thus becomes inadequate.
An alloying of this type of steel with molybdenum that heightens the dangerous temperature range within which intercrystalline corrosion occurs is promising and may make this steel suitable for work at higher temperatures (up to 550–600°c).
KeywordsNitrogen Adverse Effect Titanium Nickel Manganese
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