Ferritic alloy

Abstract

A ferritic alloy comprises the following elements in weight% [wt%]: C: 0.01 to 0.1; N: 0.001 to 0.1; O: smaller than or equal to 0.2; Cr: 4 to 15; Al: 2 to 6; Si: 0.5 to 3; Mn: smaller than or equal to 0.4; Mo+W: smaller than or equal to 4; Y: smaller than or equal to 1.0; Sc, Ce, and / or La: smaller than or equal to 0.2; Zr: smaller than or equal to 0.40; RE: smaller than or equal to 0.4; balancebeing Fe and normal occurring impurities. Moreover, the following equation has to be fulfilled: 0.014<=(Al+0.5SQ (Cr+10Si+0.1)<=0.022.

Description

technical field [0001] The present disclosure relates to a ferritic alloy according to the preamble of claim 1 . The present disclosure also relates to the use of ferritic alloys and to articles or coatings made therefrom. Background technique [0002] Ferritic alloys, such as FeCrAl alloys containing chromium (Cr) levels of 15-25% by weight and aluminum (Al) levels of 3-6% by weight, as they form a protective α-alumina (Al 2 o 3 ), the ability of alumina oxide layer is well known. The lower limit of the Al content that forms and maintains the alumina oxide layer varies with exposure conditions. However, at higher temperatures, the effect of too low Al levels is that the selective oxidation of Al will fail and less stable and less protective chromium and iron based oxide layers will form. [0003] It is generally accepted that FeCrAl alloys generally do not form a protective alpha-alumina layer if exposed to temperatures below about 900°C. Attempts have been made to op...

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Problems solved by technology

However, the resulting alloy does not provide high temperature resistance

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