SS 405 grains

[EmaD FaRaHanI]

Dear all,

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

[Ahmed Osman]

may get :-

 *  grain growth which lead to low toughness 

 *  brittle phases as Sigma or Chi which lead to loos of toughness or even cracking 

Best Regards ,

ENG. Ahmed Osman

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[Vishwas Keskar]

Is welding involved ?

If yes , what welding procedure ?

Pl. let us know 

What thickness are involved ?

[Vishwas Keskar Welding Manager WELDING]

These are straight Cr Stainless steels for high temperature application.

In boiler , you can use this material.

Pl. send what attachment part you are looking for ?

[EmaD FaRaHanI]

Thank you for your answer. I was wondering what would happen to grains of stainless steel 405 grains as hanger in boiler  when they exposed to high temperature for long time?

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[pgos...@rogers.com]

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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