Creq=%Cr+%Mo+0.7×%Nbcap C r sub e q end-sub equals % cap C r plus % cap M o plus 0.7 cross % cap N b
To use the diagram, you must first calculate the equivalents based on the chemical weight percentage of the alloying elements:
: Read the nearest "iso-ferrite" line to find the predicted FN. Key Benefits over Older Diagrams WRC diagram for standard analysis - MIGAL.CO wrc-1992 diagram calculator
: Use material test reports or spectroscopy for both the base metal and the filler metal.
The diagram plots the relationship between the and the Nickel Equivalent ( Nieqcap N i sub e q end-sub Creq=%Cr+%Mo+0
: Calculate the resultant weld metal composition based on the dilution ratio (typically 30% base metal and 70% filler for standard processes). Calculate Equivalents : Use the Creqcap C r sub e q end-sub Nieqcap N i sub e q end-sub formulas above for the final weld composition. Plot on the Diagram : Locate the intersection of your Creqcap C r sub e q end-sub (x-axis) and Nieqcap N i sub e q end-sub (y-axis) on the WRC-1992 Constitution Diagram .
) to determine the Ferrite Number (FN). This number is critical for preventing "hot cracking" in austenitic stainless steels and ensuring proper corrosion resistance in duplex steels. Calculation Formulas Calculate Equivalents : Use the Creqcap C r
Nieq=%Ni+35×%C+20×%N+0.25×%Cucap N i sub e q end-sub equals % cap N i plus 35 cross % cap C plus 20 cross % cap N plus 0.25 cross % cap C u
The WRC-1992 diagram is a sophisticated metallurgical tool used primarily in the welding of stainless steels to predict the final microstructure of a weld metal. It serves as an advanced , replacing older models like the Schaeffler and DeLong diagrams by offering higher accuracy for modern alloys. Understanding the WRC-1992 Diagram