Re: Flattening test solution

From: <Christopher>
Date: Thu Jan 13 2005 - 11:00:00 EST

On Jan 13, 2005, at 2:20 PM, + MY6600 + wrote:

> sa 312 TP 304 3"NB SCH40 rejected in flattening test
The best solution is to send back the failed piece of pipe and tell your supplier you want another one that will pass the test. The piece failed because it lacks the necessary ductility. Austenitic stainless doesn't heat treat--the solution anneal will only affect corrosion resistance. The pipe might have inclusions from insufficient discard from the ingot or there might be an excess of sulphur. You can't tell without doing some more testing. I wouldn't use it without re-running all the mechanical and physical tests specified by SA-312. And if the rest of the pipe in the order is from the same heat, I'd reject them, too. Austenitic stainless is hugely ductile when it's made properly--there should be no problem with a flattening test. Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=tGYYgMmnWxeOI3x6dRrWUoyBFMtjjSBGiZvmHLbelZr5XorY3odtOBMcCzLH_bM2J9CYUCB-KSZH">chrisw@skypoint.com</a> | this distance" (last words of Gen.

...................................| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a> Received on Thu Jan 13 11:00:00 2005