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Unread 02-11-2015, 10:17 PM   #1
Neversummer158
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4130 axle housing, worth it?

Getting ready to put together a 9" rear can get all the parts out of mild steel for $200. Chromoly for $400. Want the chromoly but I don't want to owe our Tig guy at the shop a favor. Mild steel I can mig together no issues. Should I just swallow my pride and ask him or is 4130 overrated?

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Unread 02-12-2015, 12:47 AM   #2
kg6mov
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For a housing I wouldn't bother.

I'd just get a ruffstuff housing and be done with it.
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Unread 02-12-2015, 07:31 AM   #3
Timo_90xj
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If it is a 9" housing with 3" OD .500" wall DOM axle tubes, mild steel is strong enough.
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Unread 02-12-2015, 08:45 AM   #4
Neversummer158
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That's what I was thinking just needed someone to tell me I wasnt crazy. Thank you I appreciate it
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Unread 02-12-2015, 04:37 PM   #5
Technohead
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You would also have to heat treat the 4130 after welding or else you gain nothing . . .
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Unread 02-12-2015, 11:29 PM   #6
Neversummer158
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Quote:
Originally Posted by Technohead
You would also have to heat treat the 4130 after welding or else you gain nothing . . .
Heat treat isn't an issue, I've got plenty of rosebuds and weedburners at my disposal and pyrometers. If that's not precise enough we send vessels to heat treat every couple weeks. I fab a lot and weld a buttload of pipe but I'm no metallurgist. Care to elaborate on the topic, I know people like it for roll cages nobody has mentioned post heat treat to me.
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Unread 02-13-2015, 05:11 AM   #7
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You don't heat treat steel with rose buds.

Roll cages are typically done with 1020 DOM. High end race teams might build cages from 4130 but that's a lot of $ and you would need a huge oven or else its basically throwing $ away.

A good laymans read on materials and strength can be found here:

http://www.billavista.com/tech/Artic...ble/index.html
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Unread 02-13-2015, 07:06 AM   #8
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We build and run 9'' rears mild steel in 1000whp road race cars that generate 1.5+G lateral cornering forces and Drag cars over 2000hp.
I imagine you should be OK.
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Unread 02-13-2015, 10:04 AM   #9
Neversummer158
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Quote:
Originally Posted by Technohead
You don't heat treat steel with rose buds. Roll cages are typically done with 1020 DOM. High end race teams might build cages from 4130 but that's a lot of $ and you would need a huge oven or else its basically throwing $ away. A good laymans read on materials and strength can be found here: http://www.billavista.com/tech/Artic...ble/index.html
Very nice article, I skimmed over it until I found the 4130 section, I understand what you mean now. Relieving the stress through normalization, I thought you were referring to a hardening type process. For the record we do "normalize" lots of things here with rosebuds and incredible insulation or giant buckets of lime. But to do a roll cage with that method would be ridiculous I agree. I will definitely be using mild, thanks for the input.
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Unread 02-13-2015, 10:05 AM   #10
Neversummer158
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Quote:
Originally Posted by 96zedjay
We build and run 9'' rears mild steel in 1000whp road race cars that generate 1.5+G lateral cornering forces and Drag cars over 2000hp. I imagine you should be OK.
Very cool! Thanks for the info !
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