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@Brommers
What wall thickness do you want? I've got T45 online before, but it's been for roll-cages for racing cars, so it's been chunky stuff with a 2.5-3mm wall thickness. I've never seen T45 available with a thinner wall than 16swg (c. 1.6mm) which I assume would be too chunky for your application.
Given the stresses likely to be involved, I would've thought 4130 CroMo would be fine, even without post-welding heat treatment.