A213 / A269 Stainless Steel Tubing differences 1

[dsimmons1]

What are the main differences between the ASTM A213 and A269 Stainless Steel Tubing Standards, other than their stated uses in the standard. Is one better than the other for general service Type 304 instrumentation tubing?
Also why is the finish on some tubing conforming to these standards dull while another source might have a polished surface?

 

[TEV]

A-213 pertains to seamless ferritic and austenitic alloy tubing of minimum wall thickness. Some of the ferritic compositions within the spec are not truly stainless. A-269 is seamless and welded austenitic stainless steel without specifying minimum wall. In 304 there are some minor composition differences, but these are generally not consequential. Most 304 on the market will meet either composition spec. The difference between the bright and dull finish depends on whether the producer finished by bright annealing or by pickling. A-269 is more commonly used for specifying instrumentation tubing. I suggest specifying passivated tubing, and if to be installed by welding, be aware of the significant effect of sulfur level on weld penetration and the difficulty of welding two pieces with very different sulfur contents.