Duplex ferrit IC-martensitic stainless steel
AssigneeAllegheny Ludlum Industries, Inc.
InventorRoger N. Wright
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Abstract
A ferritic-martensitic duplex stainless steel having properties between those of ferritic and martensitic stainless steels. The steel consists essentially of, by weight, from 11.0 to 20.5% chromium, from 1.0 to 6.5% manganese, from 0.005 to 0.1% carbon, balance essentially iron. The steel is additionally characterized by chromium and manganese contents within Area ABCD of the Figure, and by a chromium equivalency of from 5.0 to 11.0, in accordance with the following equation: ##EQU1##
Claims5
A ferritic-martensitic duplex stainless steel consisting essentially of, by weight, from 11.0 to 20.5% chromium, between 2.0 and 6.5% manganese, from 0.005 to 0.1% carbon, balance essentially iron;
- said steel being additionally characterized by chromium and manganese contents within Area ABCD of the FIGURE;
- said steel being further characterized by a chromium equivalency of from 5.0 to 11.0, in accordance with the following equation:
- ##EQU3## silicon, molybdenum, aluminum, nitrogen, nickel and copper being residuals, said steel having at least 5% ferrite and at least 20% martensite, said steel having an as-annealed tensile strength between 80 and 175 ksi and an as-annealed ductility between 18 and 25% elongation in 1 inch.
Dependencies are inferred from the claim text.