DIN17175/EN10216 standard specification

Over the years, many DIN standards were integrated into the ISO standards, and thus also a part of the EN standards. In the cource of the revision of the European standards serveral DIN standards were withdrawn and replaced by DIN ISO EN and DIN EN.

The standards used in the past such as the DIN 17121, DIN 1629, DIN 2448 and the DIN 17175 have since been mostly replaced by Euronorms. The Euronorms clearly distinguish the pipe’s area of application. Consequently different standards now exist for pipes used as construction materials, pipelines or for mechanical engineering applications.

This distinction was not as clear in the past. For example, the old St.52.0 quality was derived from the DIN 1629 standard which was intended for pipeline systems and mechanical engineering applications. This quality was also often used for steel structures, however.
The info below explains the main standards and steel qualities under the new system of standards.

Seamless Pipes and Tubes for Pressure Applications

The EN 10216 Euronorm replaces the old DIN 17175 and 1629 standards. This standard is designed for pipes used in pressure applications, such as a pipeline. This is why the associated steel qualities are designated by the letter P for ‘Pressure’. The value that follows this letter designates the minimum yield strength. The subsequent letter designations provide additional information.

The EN 10216 comprises several parts. The parts that are relevant to us are as follows..

• EN 10216 Part 1.. non-alloy pipes with specified properties at room temperature
• EN 10216 Part 2.. non-alloy pipes with specified properties at higher temperatures
• EN 10216 Part 3.. alloy pipes made from fine-grained steel for any temperature

Some examples..

1. EN 10216-1, Quality P235TR2 (formerly DIN 1629, St.37.0)
   P = Pressure
   235 = minimum yield strength in N/mm2
   TR2 = quality with specified properties relating to aluminum content, impact values and inspection and test requirements. (In contrast to TR1, for which this is not specified).
2. EN 10216-2, Quality P235 GH (formerly DIN 17175, St.35.8 Cl. 1, boiler pipe)
   P = Pressure
   235 = minimum yield strength in N/mm2
   GH = tested properties at higher temperatures
3. EN 10216-3, Quality P355 N (more or less equivalent to DIN 1629, St.52.0)
   P = Pressure
   355 = minimum yield strength in N/mm2
   N = normalized