SS 405 grains

EmaD FaRaHanI

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Jan 24, 2021, 10:42:58 PM1/24/21

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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

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Jan 25, 2021, 12:46:13 AM1/25/21

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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

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Jan 26, 2021, 1:45:12 AM1/26/21

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Is welding involved ?

If yes , what welding procedure ?

Pl. let us know

What thickness are involved ?

Vishwas Keskar Welding Manager WELDING

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Jan 31, 2021, 10:13:52 PM1/31/21

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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

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Jan 31, 2021, 10:31:13 PM1/31/21

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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

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Jan 31, 2021, 10:54:20 PM1/31/21

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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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