Re: who can tell me

I'd always understood higher than 800F ie 1000F+ ASM hdbk=> 560 and 980 ºC ( 1050 and 1800 ºF) depending of course on the material
----- Original Message -----
From: "Christopher Wright" <chrisw@skypoint.com> To: <PipingDesign@yahoogroups.com>
Sent: Monday, January 31, 2005 8:20 AM
Subject: Re: [PipingDesign] who can tell me

>
>
> On Jan 31, 2005, at 2:01 AM, chenysh wrote:
>
> > Who can tell me the "sigma phase" in metal material at high temperture?
> It's a chromium-rich area that forms in grain boundaries when
> austenitic stainless cools too slowly through about 800 F. It promotes
> intergranular corrosion.
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw@skypoint.com | this distance" (last words of Gen.
> .......................................| John Sedgwick, Spotsylvania
> 1864)
> http://www.skypoint.com/~chrisw/
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Received on Mon Jan 31 12:57:00 2005