Determining the correct tubing to use in an old design that specifies Dural AU4G
Hello! I am working with the following design:
It uses railing fittings and tubing in the following dimensions:
5 m tube 35 x 31 mm (chassis, frame, front fork) 1.38in
0,60 m tube 35 x 25 mm (central frame tube)
0,50 m tube 30 x 26 mm (used for reinforcements)
Dural is an obsolete trade name described as an aluminum and copper alloy used in aerospace because of its high resistance to stress and its lower density than steel .As a result of various evolutions of the designations and standards, it was then called [B]AU4G[/B] (Standard NF A 02-104), and from now on [B]2017[/B] (Standard NF A02-004 / EN 573-1)
From this I gather that 2017 Alu/alloy tubing of the above dimensions should be exactly equivalent to the original but when I search for 2017 tubing it seems like it basically does not exist. I can only find 2017 in rods and wire.
I looked at 6061 T6 seamless tubing and can only source 1.375 X 0.058 locally which is thinner than the 35 x 31 mm called out in the old plans but I don't know if this is even a valid comparison.
All I really need to know is what tubing material can I find that is between 1.31in and 1.38in that has similar mechanical properties to "Dural" in the above sizes? I hope for the corrosion resistance of 6061 T6.
I would certainly consider using 1.375″ OD x 0.049″ WALL x 1.277″ ID Seamless Stainless Steel 316 Round Tube and
1.375″ OD x 0.065″ WALL x 1.245″ ID Seamless Stainless Steel 316 Round Tube as I can source it locally.
As you can tell I know nothing about the subject. I can WORK with metals and I do nice work but this old standard has got me stumped.
A little help?