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What is the meaning of 'TR'  in weldment Tube rectangular?

Question asked by Marco Wu on Jun 26, 2017
Latest reply on Jun 26, 2017 by Jim Steinmeyer

I am designing a weldment structure.

I used steel and I used Al channel

My boss told me that Al means ALUM, so I should not use it.

Now I need to use TR rectangular tube. May I know what is TR?