Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Embrittlement Relief After Black Oxidation
Hardened steel parts (aerospace rods, SAE 8740, 42 HRc) after black oxide deposition (according to MIL-DTL-13924 [on DLA] class 1), require an hydrogen relief treatment (135 °C for 24h). According to AMS2759/9, what atmosphere is required during baking? Air? Oil ?
Thank you
GABRIELE CAMPAGNOLIPAOLO ASTORI SRL - MAGGIATE SUP, NOVARA, ITALY
2004
First of two simultaneous responses --
I don't recognize your AMS2759/9 - but normally Hydrogen De-embrittlement is performed in air.
Regards
Martin RichDML - Plymouth, UK
2004
Second of two simultaneous responses --
SAE AMS2759/9 requires the temperature to be 375 °F (191 °C) not 135 °C. It also requires a circulating air type furnace. The atmosphere is not specified.
Toby PadfieldAutomotive module supplier - Michigan
2004
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