This is the custom pvc coextrusion for windows, the black is rigid PVC, and the white one is soft PVC. It is for New Zealand market.

Can the Steel Plate be a Composite Structure with A36 Carbon Steel at the Bottom and Stainless Steel 316L at the Surface?
One of my clients sent me a drawing for our fabrication. The material is A36+316L, and the 316L surface material thickness should be at least