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Passivation causing an increase in PH Stainless Steel

Why does the tensile strength increase after passivation in PH materials? We have noticed that on some lots that the strength slightly increases after passivation. Is there a reason why? The material we are working with is PH 13-8 Mo. Also, is the material subject to embrittlement? thanks

Don Huffman
Fastener manufacturer - Torrance, CA., USA
2004

What method and temperature are you using for passivation. Depending on this it IS possible to slightly increase the tensile, but it should not be significant. You should not get hydrogen embrittlement with this grade in our experience, but the increase in tensile you are getting is saying that you may be making it harder, which could increase the brittleness.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2004

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