NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SF Bay Bridge
From: Lu Abel
Date: 2013 Apr 5, 20:37 -0700
From: Lu Abel
Date: 2013 Apr 5, 20:37 -0700
The suspicion at the moment is that the steel suffers from "hydrogen embrittlement" I'm not a metallurgist, but I understand the even very small quantities of hydrogen as an impurity in steel can seriously degrade the tensile strength of ultra-high-strength steels.
From: Örjan Sandström <pokerbacken@yahoo.com>
To: luabel@ymail.com
Sent: Friday, April 5, 2013 11:07 AM
Subject: [NavList] Re: SF Bay Bridge
no idea, not impossible, high tensile steels are, Uhm, less than ideal to work with.
How hard? I find it hard to express exactly how difficult they can be to work without resorting to quite harsh language, let us just say they require attention and good tools/machines.
I have worked steel that required the edge to be near perfectly sharpened, a tiny imperfection that would not have mattered machining even 316 stainless or hardened truck springs would make a MESS of this stuff (looked dull and uneven almost like packed silvery sand)
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