Chromoly Vs Mild Steel Chassis

When cost is a factor as for most of us mild steel is a good choice. In this short video tim mcamis explains some of the differences between 4130 chromoly and mild steel tubing for use in drag race chassis construction. One of the never ending topics of conversation is the use of 4130 steel over mild steel in professional drag racing builds.

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So if you run a comp buggy 4130 is the way to go.

Chromoly vs mild steel chassis.

4130 is better due to the amount of weight savings you can have with it. If it is mild steel then i have to rebuild the whole thing. 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. I have a dragster frame and i don t know what it is made of.

If anyone has a viable answer please let me know. With dom 4130 and docol being the most common as many sanctioning bodies do not allow mild steel erw. Aluminum is the second most commonly used material for bicycle manufacturing. Chromoloy tubing is made from a family of low alloy steels that contain chromium and molybdenum sae 4130 or 4140 along with the iron carbon and other elements.

If it s chromoly then i just have to replace a couple of struts and add more to my roll cage to bring it to specs. It s lighter and stiffer than steel but it s also more brittle and easily damaged. It will still save your life if done right. Chromoly is slightly heavier than aluminum but the frame can be thinner and has reduced stiffness which provides a smoother ride.

In today s chassis it is common to find mild steel erw tubes high strength steels hss such as dom and 4130 chrome moly chromoly and advanced high strength steels ahss like docol tube r8. In a trail rig like mine i will be using mild steel and a mig.

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