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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 [⇦ this spec 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 CAMPAGNOLI
PAOLO 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 Rich
DML - 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 Padfield
Automotive module supplier - Michigan
2004




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