Magnetic Stainless Steel 416MX

[drawoh]

I have some drawings out for fabrication, with the material specified as stainless steel 416MX. The fabricator came back to me and asked me if I wanted magnetic or non-magnetic. I told him that as far as I know, all 400 series stainles steels are magnetic, and that if I suspect he used 300 series, I would take a magnet to it.

Does this sound like an intelligent conversation? I have been searching Google on magnetic stainless steels, and it seems to be confirming my opinion. The guy I am talking to is a machinist, not an engineer.

Have I sent the job to the wrong place?

JHG

 

[EdStainless]

YES
This material will always be magnetic (at room temp.)

I hope that this is a machined part with no brazing, welding or particular surface finish requirements. 416 is a free machining grade and the high S levels raise hell. But it does cut nice.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[metengr]

I have dealt with several small shops that did not have personnel with the background to completely handle ordering materials so I had to take it upon myself to spell out exactly what I needed for a particular job. If they are performing machining only, you might be ok. I noticed the designation MX. What is the condition of the AISI Type 416 SS? Is it required to be heat treated to a specific hardness/strength or annealed for your application?

Kindly inform the machinist that this material is similar to working with AISI Type 410 SS, and see what his response is regarding machining/handling. If you feel comfortable with their response, ask for paperwork to assure that the shop has ordered the correct grade of AISI 416 SS.

 

[drawoh]

EdStainless and metengr,

Thank you.

The part is to be machined and passivated. I was not planning on heat treat. My Atlas Alloys catalogue lists a yield strength of 110ksi, without specifying the heat treat. It sounds like I need to check up on MATWEB.

I tend just to write STAINLESS STEEEL on drawings, but this time I wanted the strength and I did not absolutely care about corrosion resistance.

JHG

 

[EdStainless]

You are going to have write a better spec.
Just asking for 416 will prob. get you normalized or annealed bar at about 40ksi yield and 75ksi tensile. But watch out the minimums are 30/60.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm