Andy's suggestion will do the job nicely as 4130 is a low alloy Cr Mo steel. We use a standard 4% Nitric in Alcohol etch for low alloy steels. You can use either ethyl alcohol or IPA, both work OK and this is known as Nital by us metallurgical types

Regards
Ian

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Giamis, Andy
Sent: 03 February 2012 15:28
To: [log in to unmask]
Subject: Re: [TN] ASTM 4130 steel

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
FMA / Reliability Engineer
40 Technology Drive,
Warren, NJ 07059
(908) 546-4686 [Office]
(908) 938-7945 [Cell]
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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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