ISO/ TR 15608:2005 provides a uniform system for grouping of materials for welding purposes. It may also apply to other purposes such as heat treatment, forming, non-destructive testing.
It covers grouping systems for the following standardized materials:
steel
aluminium and its alloys
nickel and its alloys
copper and its alloys
titanium and its alloys
zirconium and its alloys
cast iron.