Super Duplex Interpass Temperature 1

[stanier]

I have recently been advised that an interpass temperature for welding super duplex stainless steel should be limited to 100C. All the texts I have read advise 150C. Apparerntly better weld control is achievable.

Comments?

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[metengr]

stanier;
The current information I have from various superduplex stainless steel suppliers still recommend a maximum of 150 deg C. Someone may have decided to impose a more conservative interpass temperature requirement to assure remaining below 150 deg C. If anything, I would use 120 deg C maximum interpass temperature to assure remaining below 150 deg C.

 

[strider6]

stanier;

I agree that 150°C is the recommended max interpass temperature, also if you look into these two reference you will find the same value.

http://www.imoa.info/FileLib/IMOA_Shop_Sheet_105.pdf

http://www.sandmeyersteel.com/2507.html

regards

S.

http://www.corrosionist.com

 

[EdStainless]

If you look at curves that show time/temp for secondary phase formation you will understand why some people push to keep the temp as low as possible.
120C is a reasonable limit.

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