Join Date: Sep 2007
Location: Gaseous Cloud around Uranus
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1000*-1100* is used to temper CroMO tubing.Normalizing is in the 700*-800* range.
Tempering will subject the complete frame to heat.Depending on the type of CroMo,the dwell time will vary depending on the yield strenght they want.It can vary greatly! This will eliminate the HAZ zone.
Normalizing will subject only the weld to the heat,in order to anneal the weld.This will broaden the HAZ zone,speading the load over a bigger area.
Tempering is done when you give a rats ass,normalizing is done when the part will not be subjected to localized stresses or they want to be cheap.
Is that frame any good? A quick Rockwell test will tell you if the fire has tempered it.Do you know any bike shops with one....NO.If I had it in front of me,I could tell you in 5 min if the fire damaged it.
That's the only way you will know,FOR SURE,if it's ok.If there are melted aluminum parts on it(1200*-1300*),chances are it's toast.If not,chances are it's good.
Would I take a chance on it,if I got it dirt cheap,I would.But I have the ability to test it before I put my butt on the line.
Last edited by Booger1; 06-14-11 at 04:38 PM.