DIN/EN Steel pipes

DIN/EN steel pipes refer to steel pipes that adhere to the standards set by the Deutsches Institut für Normung (DIN) and European Norm (EN).

DIN represents German interests in international organizations such as CEN, the European standards body, and ISO, the International Standards Organization. Today, roughly 85 % of all national standards projects are European or international in origin.

DIN/EN steel pipes are used in various applications across industries such as construction, oil and gas, automotive, and manufacturing. They are suitable for conveying fluids, gases, and solids, as well as for structural purposes. DIN/EN standards specify the dimensions and tolerances for steel pipes. These include parameters such as outer diameter, wall thickness, length, and straightness. Compliance with these standards ensures uniformity and interchangeability of steel pipes.

Our products for DIN/EN Standard has been listed as follows:

European Standards for steel

With so many European  Standards specifying steel and steel products and replacing national standards, it is necessary to have a European designation system for steel.

Such a system is well established and implemented in almost all the European Standards. European Standards for steel products are the responsibility of the European Committee for Iron and Steel Standardization.

ECISS has the task of developing European Standards for the definition, classification, testing, analysis and technical delivery requirements for the products of the iron and steel industry and the implementation of these as national standards by members in order to achieve technical harmonization within the European Union. ECISS is an Associated Standards Body within the framework of the European Committee of Standardization.

European Standards published in the UK have the status of a British Standard and are characterized by the prefix ‘BS EN’ to their reference number. Other national standards bodies of Member States of the European Union publish identical European Standards with their appropriate prefixes, e.g. in Germany, ‘DIN EN’, in France ‘NF EN’, in Sweden ‘SIS EN’ etc. European Standards are essentially voluntary instruments except for certain situations, e.g. Public Procurement Directives, Construction Products Directive. According to the CEN rules, members in the UK, that is BSI, are obliged to announce the availability of European Standards and publish the identical text and to withdraw any conflicting national standards.

Old and new DIN Designations

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*

* Normalized is defined as: normalized (warm) rolled or standard annealing (at a min temperature of 930°C). This applies to allqualities designated by the letter 'N' in the new Euro Standards.

Pipes: the following standards are replaced by DIN EN

* ASTM standards will remain valid and will not be replaced by Euronorms in the near future

DIN/ EN/ ISO DIFFERENCES

Gain an insight into the difference between DIN, EN and ISO standards!

Here you can find information on what changes have been made to the respective product standard and what differences between the DIN, EN and ISO standards this has caused. Get an overview and use the clear direct comparison of the withdrawn DIN standards and the current EN and ISO standards.

In the past, standardisation work in Germany was carried out on a national level by Deutsches Institut für Normung e. V. (DIN). On a European level there are also EN standards, as well as ISO standards on an international level, which are issued by the International Organization for Standardization.

The differences