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Ted Mooney, P.E. RET
Pine Beach, NJ

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Preventing Discoloration of Low Alloy Steel during embrittlement relief

Can anyone suggest a method of preventing the blue discoloration of low alloy steel which frequently occurs during hydrogen embrittlement relief baking at 190 deg. C.? This can be avoided by baking in a vacuum oven under nitrogen atmosphere, but this is not cost effective. The problem is mainly cosmetic. We want to avoid any post-baking treatments which might reintroduce hydrogen embrittlement.

Aryeh Asher
- Rehovot, Israel

I have tightly wrapped parts in aluminum foil to prevent that from occurring successfully in the past.

Rick Richardson CEF
Dayton, Ohio

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