As pointed out above in the nhra regulations the minimum wall thickness on mild steel is more than that of chromoly to achieve the same result and.
Chromoly roll cage wall thickness.
Yes nascar may use 95 wall tube but as i understand they require chromoly which is a whole different ball game than dom or hrew.
All roll bars cages constructed of 4130 chromoly tubing must be welded using an approve tig heliarc process while mild steel must be done with an approved mig wire feed or tig heliarc process.
X 0 083 wall thickness sold in pre cut tube lenghts of 3 7 or 10 feet for use in roll cages race car chassis roll.
Round tubing 3 4 x 058 chrome moly 8 foot length.
But you have to use larger sticks of tubing or more wall thickness and it costs you weight.
The cage chassis are one in the same.
Also while a chromoly cage is typically lighter due to its lower minimum wall thickness it can only be tig welded while mild steel can be tig or mig welded though the welds need to be clean complete without holes and show no signs of grinding.
The cage we selected comes with.
The chromium adds strength hardenability and a level of corrosion resistance to mild carbon steel though chromoly is not as corrosion resistant as stainless steel.
Main hoop main hoop support bars door bars.
Round 4130 chromoly steel tubing 1 63 o d.
A nascar cage is built completely differently than an average offroad cage.