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Old 11-16-2010, 01:46 AM   #26
Burnman
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Originally Posted by speedyHAM View Post
I was thinking of A36 steel and comparing based on yield strength. After a material starts yielding it's pretty much over.

What I meant was that it has a better strength to weight ratio, and I worded it poorly.
Fair enough. Not trying to be a dick, I just don't want noobs going around thinking that when they hear the highly technical-sounding 'aircraft-grade 6061-T6' that they can replace steel with it same for same.

Also it should be noted that welding the 6061-T6 wrecks the T6 heat-treatment, making it much weaker at the weld/heat affected area without re-heat-treatment.
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Old 03-31-2011, 03:46 PM   #27
climbhigh09
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DOM is work-hardened too, so it's strength (and brittleness) is higher than plain 1020, that and it doesn't have all the problems caused by welding a seam. Thinking about it, I'm pretty sure that you can't even run non-DOM tubing in a lot of classes. Course, where you weld DOM that hardening is gone again. (gusset gusset gusset)

My first cage I was too poor for 4130 and used 1020 DOM 1.5x.09. Rolled it on purpose at low speed (without anyone in it), didn't even dent it. Good times.
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Old 04-13-2011, 01:50 PM   #28
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Just to clear things up, 4130 is NOT T45. 4130 is not accepted by may sancioning bodies due to how brittle it gets in the HAZ.. The only way to solve that problem is to normalize the material. Since there is really no way to prove the joints have been normalized. You cannot use it.

T45 is Carbon Manganese Steel. You cant even buy it in the US and the only place that I have seen it being used is in FIA Homoligated roll cages. AKA Custom Cages UK. Its got around the same tensile strength as 4130 but its properties dont change with heat.. meaning you can even MIG weld it..

Save some money and make your subframes out of DOM 1020. Use 1" x .080". Design it well.
Absolutely agree with you and hope the OP considers your suggestion. Do you think that 1020 is many times over looked? When I was at Rallispec
talking with Dave he was saying exactly the same thing with regard to 4130 and T45.
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Old 04-14-2011, 08:06 AM   #29
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1020 is one of the most common cage materials out there...
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Old 04-15-2011, 03:12 PM   #30
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If you make it out of 4130 or any other similar alloy you can get the entire assembly redrawn to whatever harden you want. Just make sure you use a compatible rod. The reason is 4130 is air hardened. Well what do you do when you weld it? You can get 4130 up above 200k PSI tensile correct? Higher carbon amounts can get higher still.


I am not a certified engineer but some observations I may make. Aluminum doesnt seem to have the same elongation before failure like steel of similar tensile strength. Aluminum when welded is very easy to warp especially for something complicated like a crossmember.


Out of curiousity anyone know how bad a crossmember like this would tweek if you make it out of 4130 and got it redrawn back to preheat treat hardness?
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