Nickel free stainless with high Mo content

[EngineerDave]

Hi,

I am having trouble identifying this particular grade of stainless (although this is probably in part due to my use of only EDS from the SEM to do it).

It is a nickel free stainless with approx 13% Cr and 7 % Mo. I can't find this via Matweb and Metals Handbook.

Anyone familar with this type of material?

 

[mcguire]

I'll stick my neck out and say I don't think such a grade exists. Are you perhaps looking at a phase within the alloy? That is more moly than any ferritic alloy has.

 

[JimMetalsCeramics]

Are you sure you're not looking for a cobalt-based superalloy (e. g., CoCrAlY) with molybdenum in it?

 

[arunmrao]

International Moly association newsletter and bulletins speak of this grade of stainless steel. I shall try and get the publication and inform you.Please set up a Google search for this alloy it will also yield some useful results.

 

[SMF1964]

The first question that comes to mind when "High Moly" and "EDS" are used with stainless steel is: Are you looking at the low energy peak (around 2 keV) or the high energy peak (around 16 keV)? If the former, then look for the latter (you'll need to run the SEM up to 30 kV accelerating voltage) to verify that you are in fact seeing molybdenum and not sulfur. If you don't find the high energy Moly peak, then what you are looking at is a sulfur addition to the stainless steel and you're dealing with free-machining martensitic stainless, like 416 or 420.

 

[EngineerDave]

This is some great info guys. I will have to dig up what the lab findings were again.

Thanks for the replies.

 

[BobUXL]

This may be an outside thought on the subject. There has been concern in the jewelry industry about people being affected by the nickel in stainless, particulary T316. Studies by Ugine Savoie Imphy that the sulfur content can affect the nickel reaction in some people and has come out with a new alloy, Ugima 4435 ICH, which is a Ni allergy free grade that eliminates this problem. Could this be the grade you are thinking of?