I haven't played with too many Fe etches but 2 to 5% HNO3 with the remainder ethyl alcohol does ok for low-mid carbon steels.  Let the sample soak in solution for a minute or two. 

Regards,
Andy
 
Andrew C. Giamis
Andrew Solutions
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Friday, February 03, 2012 10:17 AM
To: [log in to unmask]
Subject: [TN] ASTM 4130 steel

Fellow TechNetters:

   Can someone make a recommendation on the chemical etchant for the above mentioned steel.   I am award that compatible material to this exists out there.

Victor,


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