In this recipe we will build a generic node group shader applicable, by setting different values, to the most part of different metal materials:
Now we are going to create the node group:
Click on New in the Material window under the Properties panel or in the Node Editor header.
Switch the Diffuse shader with a Mix Shader node. In the first Shader slot select a Glossy BSDF shader, in the second Shader slot select an Anisotropic BSDF.
Press Shift + D to duplicate the Mix Shader node and paste it just after the first Mix Shader node. Add a Diffuse shader (press Shift + A and go to Shader | Diffuse BSDF) and connect it to the second Shader input of the second Mix Shader node.
Add a Fresnel node (press Shift + A and go to Input | Fresnel) and connect it to the Fac input of the second Mix Shader node.
Add a Mix node (press Shift + A and go to Color | Mix), set the Blend Type to...