Allowable stress and wt for ASTM A-519 Grade 4130 tube. ASTM A519 Gr. 4130. It will give you all the details. B. You said that the design temp is room temperature (I am not sure if you meant this temperature as Operating or Design. even if it is operating at room temp (which I am assuming 21C, your design temp. can be assumed as 31C with a 10C margin).
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