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Re: which steel
I've used ASTM A514, which I believe is similar to A516. These are both low
carbon construction Steels. They are typically used where price is a
consideration, but also where strength and plasticity is a consideration.
Weldability is very good. They are typically used for large structors and
boilers. AISI 4130 is similar to 4140, which I've used for dies. The last
two digits (sometimes 3) identify the % carbon .01 These are considered
machinery steels (higher carbon content), and include Mo and Cr (first two
digits), which make them more corrosion resistant and improves their wear
resistance. They can be heat treated to increase their strength
significantly (100 Kpsi yield). I would imagine the A516 is cheaper, but
that's a guess. Hope this helps, happy welding.
Suds
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