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I Forge Iron

4140 vs 4130

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I see many reference 4140 steel, but have yet to see any mention of the venerable old 4130. Many old axle shafts are made from 4130, as well as many enclosed driveshafts. Along with various other easily obtainable car parts.  Just curious as to the preference of 4140 over 4130.  I have plenty of 4130 to work with, but I'd have to go out and buy 4140.


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