AISI 9840 stainless?

[RayJohnson2]

Hi all,

Well, the title of this thread already says it.
Is AISI 9840 stainless? Or can it rust in a 'normal' (but humid) atmosphere?

Kind regards

 

[EdStainless]

9840 is just a Cr-Mo steel. You need to be up over 12% Cr to really get any stainless, and with high C you would need higher Cr than that.

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P.E. Metallurgy

 

[RayJohnson2]

Well, the 'Nickel-Chrome' put me in doubt...
Thanks, Ed!