TEMPERATURE LIMIT FOR DUPLEX SS
TEMPERATURE LIMIT FOR DUPLEX SS
(OP)
Dear all,
I would be grateful if someone lets me know which is the suggestable temperature limit for the apllication of DUPLEX material ( 22% Cr - UNS N031803 - SAF 2205 )-
I learnt that, for ASME Code Div. 1 - Part II , the temperature limit is 315°C ( 600°F) ; over this temperature NO allowable stresses are available.
In addition to the tempearature limit could you please also explain the reasons of such limitation and the effect on the Duplex SS material if exposed at such high temperature ?
thanks in advance
GENGI
I would be grateful if someone lets me know which is the suggestable temperature limit for the apllication of DUPLEX material ( 22% Cr - UNS N031803 - SAF 2205 )-
I learnt that, for ASME Code Div. 1 - Part II , the temperature limit is 315°C ( 600°F) ; over this temperature NO allowable stresses are available.
In addition to the tempearature limit could you please also explain the reasons of such limitation and the effect on the Duplex SS material if exposed at such high temperature ?
thanks in advance
GENGI





RE: TEMPERATURE LIMIT FOR DUPLEX SS
The reason for the upper temperature limit imposed by ASME Section II subcommittee on Materials is that the duplex stainless steels develop harmful phases or precipitates at prolonged elevated temperature exposure that results in reduced strength and significantly reduced ductility.
RE: TEMPERATURE LIMIT FOR DUPLEX SS
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: TEMPERATURE LIMIT FOR DUPLEX SS
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RE: TEMPERATURE LIMIT FOR DUPLEX SS
These alloys will work for many years at 600F. I have seen tests where a couple of weeks at 630F caused serious damage.
If the highest inlet temp of your unit can ever exceed 600F (not mean metal temp) then a duplex or ferritic stainless is not a safe option.
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