FATT test - X20CrMoV11-1

[Garlik]

Hello.

I need to define a procedure to perform the FATT test for the material X20CrMoV11-1.
In theory this procedure will be based in the standards A370 and ASME Section III NC2300.
I know that we need to perform some tests up to different temperatures to define a curve. What I don't know is which range of temperatures should we test for this material.
Do you know any paper or brochure or whatever talking about this?

Thanks in advance for help!

 

[metengr]

Are you familar with and have you reviewed ASME B&PV Code, Section III?

 

[Garlik]

Yes, I have reviewed this Standard. The problem I have with it is that the material I am talking about does not apply in the exceptions of subsection NC-2311. And according to what the supplier tells me, it is not possible to determine a temperature for FATT with this material.
Is for that reason I am asking if anybody has experience with that.
Thanks.

 

[ijzer]

You could determine the FATT 50/50 by doing impact tests at different low temperatures untill your impact testpieces show about 50 ductile appearnce .
Note that X20CrMoV11-1 is actualy a material for high temperature , so why would you be interested in its low temperature behavior. Secondly this material is not accepted for ASME Codes.

 

[Garlik]

Thanks for your reply.

The problem is that I don't have any experience with FATT.

FATT is only used in low temperatures? Can we perform it at 100°C for example or more?

And then, which procedure/standard should I use instead the ASME code? Which EN talks about the procedure?

Sorry for these questions if they sound stupid, but I am a bit lost.

Thanks!

 

[metengr]

Garlik;
Fracture appearance transition temperature (FATT) is a reference temperature obtained from either Charpy or other impact test to describe the ductile to brittle fracture behavior of a material.

There is plently of reference material on the internet describing what is FATT.