Re: Impact test & Trim 13% Cr facing

From: <Christopher>
Date: Wed Aug 08 2007 - 13:14:00 EDT

> "Lateral expansion specified for stainless steel is not acceptable
> as we
> see the lateral expansion is more related to the poison ratio and
> hence
> stress.

Your client is mistaken. Lateral expansion in the impact test is a valid measure of the ability of the material to yield. You'll have to do your own research on this. I think I saw the matter discussed in some PVRC papers years ago.

For impact test requirements use Section VIII Div 1 UCS-65 for guidance. Normally austenitic materials like your stainless steel don't require impact testing because they don't lose toughness like ferritic steels.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=ZBQO1HBZfVUmUDIybwwe_z0TAIOpQz03aEO8PqMAosNJDibyrecwBFj_4xDxT3MwVYWUvfrBYxEvS-XF">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 Wed Aug 08 13:14:00 2007