What metal exterior were Chevrolet suburbans made from 1992-2006 made out of?

Ok. I own a 2002 Chevrolet Suburban that my mom used to have and over it's 13 years it has gone through a lot.

It got hit by a Ford F-250 Super Duty Truck on it's side and it didn't even get a large dent at all.

The time I have had it, on accident, I ran into the worlds toughest poll. It was small, but made out of cemented concrete. It destroyed my bumper and damaged my grill pretty badly. When I got the bumper replaced and my grill repaired, I noticed that those were the only parts of the car that got damaged. I also on the side, felt the rest of my car's exterior seemed to be made of pretty heavy metal.

Now I know that no car out there, even ones made back in the late 1940s could withstand being hit by a concrete poll head on without it's bumper and grill being either destroyed of heavily damaged. Especially the bumper.

Given that my car has been through quite a lot during it's time, the truck hitting it included, I wonder if Chevrolet Suburbans made from the early 90s all the way to 2006 were made out of steel.

My question is, what exterior metal were Chevrolet Suburbans from 1992-2006 made out of? Were they made out of steel?

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