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Old 12-11-2007, 12:11 PM
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Using Stainless Steel VS Steel

I'm building some custom lower A-Arms, for a 2500lb car. I would like to use stainless steel, but I dont know if its strong enough. Any thoughts on using SS vs. regular steel?

Ben

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Old 12-11-2007, 02:05 PM
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Stainless steel is stronger and more expensive than plain carbon steel of the same thickness. It is also harder to form (it will spring back more) and harder to weld. You can compare material properties of prospective grades of material at http://www.matweb.com/
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Old 12-12-2007, 12:30 PM
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Maybe modify that a bit. Tensil strength is slightly better for Stainless 304 but it's yield strength is lower, compared to mild steel 1020 cold rolled.

Think of stainless as a rubber band. It stretches a long ways before it fractures. Mild steel does not yield or stretch as far for a given load and will fracture at a lesser value than stainless 304.

For a light weight car driven normally, not a race car, if appearance is very important, stainless might be ok. I'd go up a size for the stainless. It's much harder to weld properly.

Actually if you are custom building I'd go with 4130 and be done with it. Cost is very close to seamless mild steel and it is very easy to TIG weld. The metal bender will hardly notice the difference.
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Old 12-14-2007, 07:52 AM
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Quote:
Originally Posted by brainsboy
I'm building some custom lower A-Arms, for a 2500lb car. I would like to use stainless steel, but I dont know if its strong enough. Any thoughts on using SS vs. regular steel?

Ben
Why do you want to use stainless? Rust prevention?

Just curious.
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Old 11-18-2010, 01:58 AM
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Quote:
Originally Posted by ckucia
Why do you want to use stainless? Rust prevention?

Just curious.
Maybe thatís the main reason. As we all know that stainless steel is the best in corrosion resistance, fire and heat resistance, has the aesthetic appearance, the most hygiene steel, and has the long term value among others. The longevity of stainless steel is the result of the alloying composition and, therefore, it has a natural corrosion resistance. It does not need additional systems to protect the base metal, the metal itself will last.
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Old 11-18-2010, 10:41 AM
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Quote:
Originally Posted by brainsboy
Any thoughts ...?
my thoughts: not knowing your skills as a fabricator, don't build them.
i consider my self an experienced and skilled fabricator, i would not consider building a set.
it's a safety issue. any failure in an a-arm will cause major and catastrophic lose of steering.
i don't like the idea of a car coming towards me at 70mph on home made a-arms
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