Chromoly Vs Mild Steel K Member

4130 alloy steel carbon steel vs.

Chromoly vs mild steel k member.

Ths tress relieving part is bogus. Some are stronger then others but some you are going to pay out the ass for. There are going to be people saying chromoly will crack or i have this friend that blah blah blah. Cage mild steel vs.

Upr s all new chrome moly k member will save more weight and exceed any strength limitations of mild steel while allowing maximum header and oil pan clearance. This kit was designed for the abuse of hardcore drag race road race and street enthusiasts. A 25 2 cage will cert a car to run 6 0 and slower at 3200 pounds max. Also keep in mind that it is harder to weld the 4130 than the mild steel.

Use er70s wire and you won t need to passivate the welds since the wire is ductile. Drag racers benefit more from using chromoly because they can use a thinner wall steel over mild. A sfi 25 5 cage can be either mild steel or chromoly however a 25 2 cage must be chromoly only. But the fact is someone has had a problem with all brands steel or chromoly.

4130 alloy steel. Crome molly chromemoly has a higher ultimate strength so it is much harder and a mild steel cage will fail before it does. A 25 5 cage will cert a car to run 7 50 or slower at a max weight of 3600 pounds. I did not understand either as i came from drag racing but that is what the ot sanctioning bodies require.

When racecars were just beginning to be made from chrome moly there were brittle failures caused by the lack of heat treating and stress relieving. 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.