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RE: Threaded Stainless Steel Rod[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Threaded Stainless Steel Rod
- From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
- Date: Fri, 1 Oct 99 09:15:06 -0500
>The reason I avoid the AISI grades is that the mechanical properties vary >with the manufacturer. Absolutely bang on. _Always_ use ASTM specs for load-bearing material. I'd like to emphasize this with a story of my own involving a particular supplier's brand name of quenched and tempered steel plate. We used the brand name to order material which was duly supplied us. After we'd used much of it we found our steel had the [proper brand name but had been specially heat treated to a very high hardness and was nowhere near as tough as we needed. We had no recourse, and we ate the order. We got exactly what we said; the supplier wasn't at fault because he didn't know what we meant. Had we referenced the proper ASTM spec, we would have had received the steel we had in mind and clear grounds for rejecting the material. We would also not have had to wait around for one particular manufacturer to roll what we wanted and stamp his brand on it. This was a very difficult and expensive material QA lesson. ASTM specs provide not only chemistry but minimum strength properties, appropriate toughness requirements, fabrication and processing practice and dimensional tolerances. If you don't cover yourself this way, you're effectively letting a supplier make your material choices for you, and sure as eggs is eggs you'll wind up holding the brown end of the stick. Christopher Wright P.E. |"They couldn't hit an elephant from chrisw(--nospam--at)skypoint.com | this distance" (last words of Gen. ___________________________| John Sedgwick, Spotsylvania 1864) http://www.skypoint.com/~chrisw
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