T-1, T-100, QT (Quenched and Tempered) 100 ... Same - Same just different terminology depending on what your local steel shop calls it.
Main rails should be QT-100.
Cross members will be "Mild" Steel, and should be "Wide Flange" available at just about any steel supplier.
I pre-heat rails, then weld out with Hobart Fabco110 (Dual Shield Flux Core) or with 110-18 to match the characteristics of the stronger of the 2 metals, which is the QT-100.
Other than the way the damage was caused, it is a pretty common, and straight forward repair.
Have a Good Night.
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Thread: Heavy Haul Trailer
03-22-2010, 08:51 PM #11Later,
Professional Spark Generator by Trade.