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Re: STEEL: Stainless Steel for Structural Applications

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On Apr 6, 2005, at 2:07 PM, Polhemus, Bill wrote:

1) How do you design using 304/316 stainless structural members in the U.S.?
Actually there's not much in the way of hot rolled structural members around. There isn't a whole lot of difference between annealed 304 and 316 stainless and carbon steel, except that stainless doesn't exhibit elastic-plastic behavior. The yield point is taken as the 0.2% offset and for 304 the minimum specified yield is 30 ksi. There's enough slack in this figure so the non-linearities don't make a lot of difference. The elastic modulus (28E6 psi) is a little less than carbon steel but the actual difference gets lost in the white noise. Hot rolled stainless doesn't lose strength when it's welded like cold formed stainless, so that part is simpler. Stainless has a higher CTE than carbon steel so weld distortion is sometimes a problem. There are plenty of stainless fastener specifications, so that isn't a problem, but you neex to be careful about choosing a proper grade to avoid galling.

A lot of stainless steel is used in nuclear plants and there's no particular difference in the ASME Code design rules for stainless and carbon steel. Both are pretty much identical to the ASD rules for carbon steel.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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