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AMS-QQ-N-290 corrosion resistance?

Q. What is the Corrosion resistance of Nickel electroplating AMSQQN290 at Salt test ASTM B117?

Anat Gilboa
- Israel
July 7, 2009

Does AMSQQN290 require that 303 CRES receive stress relief?

Q. Is 303 CRES considered to be steel according to paragraph 3.2.2, AMSQQN290B? Is it required to be heat treated after machining for stress relief?

Ron Zimlich
- El Cajon, California, USA
August 28, 2013

First of two simultaneous responses -- September 4, 2013

A. Ron,
Yes, h.t. is required unless otherwise specified if the material in question was machined, ground, cold formed or cold straightened.

Blake Kneedler
Feather Hollow Eng. - Stockton, California

A. Hi Ron,

303 is a 18-8 stainless steel, so if you have been cold working this in any way you need to stress relieve in accordance with para 3.2.2. There is no get out clause for low strength materials so it needs to be done.

Brian Terry
Aerospace - Yeovil, Somerset, UK
Second of two simultaneous responses -- September 5, 2013

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