PD CEN ISO/TR 20172:2021

What is ISO/TR 20172 about? 

ISO/TR 20172 establishes a European grouping system for materials for welding purposes. This system is classified in accordance with the grouping system of ISO/TR 15608. It is also applicable for other purposes such as heat treatment, forming and non-destructive testing. 
ISO/TR 20172 covers grouping systems for the following standardized materials: 

• Steel 
• Aluminium and its alloys 
• Copper and its alloys 
• Cast irons 
• Nickel and nickel alloys 

Note: For materials that are not assigned to a group in ISO/TR 20172, the criteria of ISO/TR 15608 apply. 

Who is ISO/TR 20172 for? 

ISO/TR 20172 on welding applies to: 

• Construction, automotive, mechanical Industries 
• Sheet metal manufacturers 
• Manufacturers of pressure vessels 
• Manufacturers of aircraft & aerospace 
• Shipbuilding industry 
• Welding equipment manufacturers 

Why should you use ISO/TR 20172? 

It is important to classify and group materials for welding purposes. The use of material classification and grouping for welding purposes in accordance with ISO/TR 20172 improves the quality and efficiency of welding operations used in manufacturing and heat treatment processes. 

ISO/TR 20172 helps design engineers to design cost-effective products by choosing appropriate standard classified material according to market demand and best industry practice ISO/TR 20172 aids design engineers to communicate design requirements for a particular manufacturing process and product. 

With a better classification of materials, you will be able to determine the chemical composition and mechanical qualities of the material, ISO/TR 20172 allows you to manufacture the high- quality products. 

What’s changed since the last update? 

PD CEN ISO/TR 20172:2021 supersedes PD CEN ISO/TR 20172:2009, which is withdrawn. 

The technical changes compared to the previous edition are as follows: 

• Tables 1 to 5 have been revised 
• New Table 6 has been added for nickel and nickel alloys