Schaeffler Diagram Calculator (Cr and Ni equivalent)

The Schaeffler-DeLong diagram can be used to predict the microstructure of a stainless steel or of a welded joint from its chemical composition. Phase formation naturally also depends on the heat treatment applied, so treat these results as as-cast, with no treatment applied.

Since chromium is the main ferrite stabiliser and nickel the main austenite stabiliser, the formulas for predicting that balance are:

Nieq = %Ni + 30 x (%C + %N) + 0.5 x (%Mn + %Cu + %Co)

Creq = %Cr + 1.5 x %Si + %Mo

Enter your values in the fields below to obtain the Ni and Cr equivalents:

Cr (%):

Ni (%):

C (%):

N (%):

Mo (%):

Si (%):

Cu (%):

Mn (%):

Co (%):

Results:

Plot the points on the diagram below to see the microstructure of the selected material and which material it resembles: