telling the difference

[G.Scaffe]

Is there any way to tell the difference between ats34 and 440c? I got some un-marked and i'm not really sure what is what.
thanks
Gene

 

[tom mayo]

If you really need to know, cut off some little pieces and send them to Paul Bos and he will h/t them and tell you what they are.

 

[george tichbourne]

Leave it in a moist area for a couple of days, the ATS will show rust spots first.