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What the hey?

[For the air hardening steels, there are a bunch of them out there, the most prevalent probably being Reynolds 853 - they precipitation harden with increased temperature (these are high temperatures - nothing is going to happen to the frame if you, for example, leave it in the sun - the temps we are talking about are those near the weld)[/QUOTE]

What "precipitation" hardening are you decribing that takes place at weld? PH requires a quench cycle which is a seperate animal altogether. It makes no sense at all for 853 to suffer that process. Perhaps what you meant is that 853 simply hardens at the weld joint (after air cooling). See: http://www.reynoldsusa.com/internet/english/prodrange/steel/ahsmain.htm
 
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