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Old January 25th, 2010, 11:03 PM   #1
kj kyle
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Default aluminum vs steel corner guards

I see alot of companies releasing aluminum corner guards. savvy is even selling blanks, shipped for $299, which makes it cheaper than virtually any steel ones i've seen.

so you get a 50# weight reduction (says poison spyder), and their cheaper.... how do they compare strength wise?
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Old January 25th, 2010, 11:16 PM   #2
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When it comes to something that may take a hit I always go for steel. I'm not to sure why the weight really matters if its a corner guard. I would rather have something that can take more of a hit than be light imo.
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Old January 25th, 2010, 11:23 PM   #3
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There is an ongoing discussion about this over at Pirate: http://www.pirate4x4.com/forum/showt...light=aluminum
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Old January 25th, 2010, 11:31 PM   #4
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good find.

I would still like to hear what GL4x4 has to say... because here, I have a general idea of who I can trust, and who is just pulling shit out of their ass.
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Old January 26th, 2010, 06:26 AM   #5
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Strength? Depends on the grade of steel and the grade of aluminum.

If you look at basic 1018/1020 steel, it's yield strength is around 30,000 psi. (Ryerson) Aluminum 6061 is 7,000 psi.

There are a bazillion grades of steel and aluminums so if you want comparisons, you need to know exactly what materials you are talking about. With that said, I think a general rule of thumb is steel is stronger 3:1. (weight differance also)

To me, aluminum corners are purely cosmetic.
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Old January 26th, 2010, 08:02 AM   #6
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Strength? Depends on the grade of steel and the grade of aluminum.

If you look at basic 1018/1020 steel, it's yield strength is around 30,000 psi. (Ryerson) Aluminum 6061 is 7,000 psi.

There are a bazillion grades of steel and aluminums so if you want comparisons, you need to know exactly what materials you are talking about. With that said, I think a general rule of thumb is steel is stronger 3:1. (weight differance also)

To me, aluminum corners are purely cosmetic.
or to just cover damage and/or hide the old wheelwell after a stretch. Alum may be harder to keep paint on too.
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Old January 26th, 2010, 08:10 AM   #7
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Strength? Depends on the grade of steel and the grade of aluminum.

If you look at basic 1018/1020 steel, it's yield strength is around 30,000 psi. (Ryerson) Aluminum 6061 is 7,000 psi.

There are a bazillion grades of steel and aluminums so if you want comparisons, you need to know exactly what materials you are talking about. With that said, I think a general rule of thumb is steel is stronger 3:1. (weight differance also)

To me, aluminum corners are purely cosmetic.
Are you saying then that an aluminum car hauler is purely cosmetic?
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Old January 26th, 2010, 08:12 AM   #8
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ummmmmm. I think if you read my quote in your post, I said aluminum corners are cosmetic.
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Old January 26th, 2010, 08:21 AM   #9
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Trailers aren't meant to be bashed into stuff either. Plus don't they crack all the time?
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Old January 26th, 2010, 08:22 AM   #10
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ummmmmm. I think if you read my quote in your post, I said aluminum corners are cosmetic.
Yes, I know what you wrote. Why would you think that aluminum corners are cosmetic, but aluminum trailers are not?
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Old January 26th, 2010, 09:55 AM   #11
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Yes, I know what you wrote. Why would you think that aluminum corners are cosmetic, but aluminum trailers are not?
Likely because the structure in a trailer can compensate for the reduced strength of aluminum.

Usually people will say that aluminum can be just as strong as steel, yes, it can, weight for weight. Aluminum is around 3 times weaker, but around 4 times lighter. So if you use the same weight of aluminum as steel, then yeah, its as strong, its also a lot thicker.

In a trailer, you gain strength by beams & structure. So you can use a taller/larger beam, or more beams with aluminum and gain strength to offset the lower tensile/yield strength compared to steel.

Now, going back to the corners, you have the exact same material shape and thickness, nothing extra in those aluminum corners to make up for the loss of strength.

The two situations are very much different.
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Old January 26th, 2010, 10:23 AM   #12
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The 6061-t6 aluminum has yield strength of 40,000. This is what the aluminum corners are made of. I'm not sure what type of steel the regular steel ones are made of, however, since companies that sell these do not advertise what they use, one can assume they are made from carbon strengthened steel 1018. If that's the case, then the aluminum ones would be just as strong or stronger than steel corner guards.
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Last edited by howell_jeep; January 26th, 2010 at 05:36 PM.
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Old January 26th, 2010, 11:37 AM   #13
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I had a whole long reply typed out and lost it. I'm not going to retype right now.

Comparing aluminum to steel is not as simple as looking at the the yield strength. If you're convinced that the same thickness alunimum corner guards will work as well as steel, go for it. For me, not a chance.

(take a look at Br hardness and modulus of elasticity while you're at it)
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Old January 26th, 2010, 11:39 AM   #14
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http://www.matweb.com/search/DataShe...08db22a53e2421

http://www.matweb.com/search/DataShe...e10be5b&ckck=1

There is no way an affordable aluminum corner guard is going to outperform a steel one of the same general construction. The material properties just arent there. If you're talking about decoration or ease of use then sure, aluminum gets the nod. There is a reason skid plates are steel and aluminum hasnt caught on.
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Old January 26th, 2010, 11:52 AM   #15
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Quote:
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The 6016-t6 aluminum has yield strength of 40,000.
40,000 inches?
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Old January 26th, 2010, 11:54 AM   #16
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40,000 inches?
psi.

Quote:
Originally Posted by 95geo View Post
http://www.matweb.com/search/DataShe...08db22a53e2421

http://www.matweb.com/search/DataShe...e10be5b&ckck=1

There is no way an affordable aluminum corner guard is going to outperform a steel one of the same general construction. The material properties just arent there. If you're talking about decoration or ease of use then sure, aluminum gets the nod. There is a reason skid plates are steel and aluminum hasnt caught on.
ha, I forgot about that site. I'm glad you found it useful. And yeah, how many light weight aluminum frames are out there on cars????
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Old January 26th, 2010, 12:00 PM   #17
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I look stuff up every day, sometimes I'm just bored and looking for cool materials!

Now if all these people wanting alumium were really ballers they would get .040" Ti corner guards...
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Old January 26th, 2010, 12:26 PM   #18
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Originally Posted by whiterhino View Post
psi.



ha, I forgot about that site. I'm glad you found it useful. And yeah, how many light weight aluminum frames are out there on cars????
How many KSI is that?















klidding kidding lol
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Old January 26th, 2010, 05:05 PM   #19
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Don't know if it matters, but at work I use these numbers to get close to weight...

Find volume in inches and multiply by one of these:
.099 for Alum.
.281 for steel.

So a 24"x24"x.187" sheet weighs:
Alum = 10.6lbs
Steel = 30.3lbs

Just for ref....and I hope its right, its what I've used for years.

Lucas
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Old January 26th, 2010, 05:07 PM   #20
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NOT BEING PICKY....... 6016-t6 Should be 6061-T6 if comparing data. My $.02
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