Re: 11-13% Cr Steel + Stellite

On Feb 28, 2008, at 10:21 AM, Mohammed Aalamgeer wrote:

> 11-13% Chromium is basically Matensitic Stainless
> Steel, The other names for this particular material
> are A182 F6A and UNS S41000
>
> For more information please refer ASTM A182.
The foregoing is party true but mostly misleading. Lots of highly dissimilar materials use 10-12% chromium for alloying, some of which are 400 series stainless and some aren't. There's a lot more to this than what's been stated so far.
check <http://www.alleghenyludlum.com/ludlum/pages/products/xq/asp/G. 4/qx/ProductLine.html> for a brief rundown of martensitic stainless steel. ASTM A-182 covers forgings made from a dozen different grades of austenitic and martensitic stainless. Martensitic stainless is available in plate (SA-240 gr 410), tube (SA-268 tp 410) and bar (SA-479 gr 410) as well as the forging specification. UNS S410000 covers AISI standard chemistry only and isn't suitable for specification since the material is heat treatable to different strength and hardness levels. There are other UNS designations for other 400 series stainless steels as well

You can't be careless when you're talking about alloys and material specifications.

Christopher Wright P.E. |"They couldn't hit an elephant at chrisw@skypoint.com | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania