what will happen to the grains of a ferritic stainless-steel type AISI 405 used as an attachment of a hanger bar in a boiler, when it is exposed to flame temperatures of the boiler for 4 years of continuous operation? It is understood that the 405 steel will not oxidize in the high-temperature service environment.
Regards,
Emad
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Hi Emad,
Your query does not provide details about design/working condition.405 is a ferritic stainless steel. These steels have “good oxidation resistance “however lacks the ductility which is well evident in austenitic stainless steel. 475 Deg embrittlement may be a possibility upon prolonged exposure @ 500 Deg or more. Read the attached extract from API-RP-571 and proceed for any inspection/ damage assessment as required.
Hope this would be of help.
Thanks.
Pradip Goswami.P.Eng, IWE.
Independent & Consulting Welding & Metallurgical Specialist
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