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Duplex Alloy 2204 Heat Hint Removal

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Execmanone

Civil/Environmental
May 19, 2008
1
Is there a non-hazardous removal process, or no removal required, for a Dry Flue Gas Desulfurization (DFGD) Duplex stainless steel vessel with blue and black heat tint from excessive temperature during welding?
 
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Not sure of answer to the specific question, but we have seen excessive brittleness of thin wall 2205 welds and very low fatigue life at the weld. If you read the literature by the 2205 vendors, the only situation where pre-heat is recommended is thin wall welding- to avoid a cooldown rate that is too fast to ensure proper cyrstal formation of ferrite/ austenite mix.
 
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