Bagel: if you're dealing with steel plates with a low molybdenum content, then the following article (www.gorni.eng.br/e/Gorni_JAI_Set2008.pdf) might be of help. You can also check out the mechanical engineering forum over at eng-tips.com; there are some seriously knowledgeable mechnical engineers offering input on these
_________________________________________________________________
My interests include duplex valves from The Alloy Valve Stockist, Barcelona, Spain at
http://alloy-valves.com