I understand that. My thoughts though are if I'm spending $50k on my raptor, I'm not going to sneeze over a small difference in cost for going with a better material bumper. Yes they may be equal strength, but the thinner wall chromoly does save some weight. And while 15 lbs or so may not sound like a lot, it adds up over time in a lot of places. Equal strenght, lesser weight, reasonable price difference, sounds reasonable to me.
I just had a rollcage installed my my 00 HD truck, and went with Chromoly in there. Cost a bit more, and if I ever need to USE the cage, the truck is trashed anyway, and the safety of the chromoly is equivalent to the safety of a mild steel thicker wall cage, so really the end result difference is only the weight. With as much money as I have invested, I'd prefer to go with the higher quality setup.
And as for welding, same with my cage, TIG welding only, I wouldn't want a bumper with MIG welds all over it.
Going back to the comment on bending the tubes, I have done some fabrication building a Hybrid SAE car, and we used some mild steel and some chromoly, and I did all the bending for the tubes for the chassis, and holy cow, night and day difference bending mild steel vs bending chromoly.
15lbs is 2 gallons of washer fluid. Lets not get crazy in here
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