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Tube for Low Temps

Tube for Low Temps

Tube for Low Temps

(OP)
I'm making a handle from 20 square hollow tube that might be used in low temps -40C.
Ordinary MS would suffice for the stresses but what spec would I need for the cold snaps (excuse the pun). 43D EE ?
Anybody help?  UK spec preferred

RE: Tube for Low Temps

Are there any welds?  Is the part formed much?
Most low carbon steel grades would work fine, but welds could be a concern.

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RE: Tube for Low Temps

(OP)
Yes it is welded but I have the correct welding procedure/wire . It was originally made from plate EN10025 S275 K2G3G4

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