En39B equivalent steel

[swirlpot]

In the process of reverse engineeing some transmission gears and I am searching for a US spec equivalent to UK spec EN39B Alloy Steel in which the gears were manufactured out of.

 

[codeeng]

There appears to be no direct American equivalent but this site shows AFNOR, DIN and Werkstoff equivalents.

http://www.hpceurope.com/vgb/fichtech/infogenerales/matieres/equivalence.html

 

[Carburize]

There is no direct equivalent but I would substitute SAE 9310.

 

[Flesh]

SAE-AMS 6264 is fairly close:

STEEL, CARBURIZING GRADE, BARS, FORGINGS, AND TUBING, 1.2CR - 3.2NI - 0.12MO (0.14 - 0.20C).
"These products have been used typically for carburized parts which require high minimum core hardness with a narrow range, but usage is not limited to such applications."