ISO/TR 15608:2017 provides guidelines for a uniform system for grouping materials for welding purposes. It can also be applied for other purposes, such as heat treatment, forming and non-destructive testing. It covers grouping systems for the following standardized materials: ? steels; ? aluminium and its alloys; ? copper and its alloys; ? nickel and its alloys; ? titanium and its alloys; ? zirconium and its alloys; ? cast irons.