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When to use A581 and A582

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dgallup

Automotive
May 9, 2003
4,712
These two specs both cover free machining stainless steel materials. A581 is for wire & wire rod, A582 is for bars. What is the difference between a rod and a bar? The metallurgist (long retired & not replaced) who wrote our spec referenced A581 which is for wire and wire rods. I believe he stated that anything below a certain size (1/4"?) was a rod and not a bar. The size we are buying is round .176".

Now we have a new supplier PPAP with certs to A582. Chemically, there is no difference, I have no problem using the material. My only concern is matching certs to specs during quality audits. I don't really want to track down every reference to A581 and change it to A582 but I will if that is really the right thing to do. How do you decide which spec to use?

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dgallup, see ASTM A-555, at a quick look, it appears wire is coiled, bar is cut and straightened.

Regards,

Mike
 
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