DIN/EN Steel pipes

DIN Standards are the results of work at national, European and/or international level.

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.

BS3059 II 360

BS 3059-2:1990 requirements for tubes not exceeding 127 mm outside diameter and 12.5 mm thickness. Depending on the operating temperature, it can be divided into two kinds general boiler pipes and high-pressure boiler pipes.

BS3059-II 440

BS 3059 PART 2-78 is the standard specifies the steel boiler and superheter tubes carbonn alloy and specified elevated temperature prop.


P235GH is a European specified steel for use in pressure vessels, boilers and heat exchangers. The composition of this steel makes it ideal for applications where elevated working temperatures are the norm and the material is used by fabricators throughout the oil, gas and petrochemical industry.

Seamless steel tubes for pressure purposes

  • EN 10216-1    Non-alloy steel tubes with specified room temperature properties
  • EN 10216-2    Non alloy and alloy steel tubes with specified elevated temperature properties
  • EN 10216-3    Alloy fine grain steel tubes
  • EN 10216-4    Non-alloy and alloy steel tubes with specified low temperature properties
  • EN 10216-5    Stainless steel tubes


  • z.Bsp: P235GH TC1, P235GH TC2, 16Mo3
DIN 17175

DIN 17175 steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high (градусов 600) temperature and high-pressure devices. This alloy steel pipe is just a big class,and it has many classifivations.

Main Steel grade:
  • DIN17175 St35.8
  • DIN17175 St45.8
  • 15Mo3
  • 13CrMo44
  • 10CrMo910
EN 10028 – P265GH

P265GH is a weldable pressure vessel and boiler steel grade used by the world’s industrial fabricators. The material, which is ideally suited for elevated temperature service, is commonly found in the oil & gas, petrochemical and chemical industry.

DIN 2391

DIN 2391 standard specifies the Seamless steel tubes used forMechanical and Automobile.

The main products of steel / steel grade:

  • DIN2391-1 ST35
  • DIN2391-1 ST45
  • DIN2391-1 ST52
BSP British Standard Pipe

The British Standard Pipe (BSP) is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread.

BS3059 Part I, BS3059-I 320 CFS

BS 3059 standard accord to the steel boiler and superheater tubes. Part I-87 low tensile carbon steel tube without specified elevated temperature preperites.

DIN 2440

The DIN 2440 standard applies to medium-weight tubes suitable for screwing used in applications of medium pressure air and non-hazardous gases. The most common material is St33.2(also known as S185) conforming to DIN 17100. DIN 2440 steel pipes are often supplied in seamless type with zinc coating.

Seamless Steel Tubes

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:

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


Old standard

Execution Norm Steel grade
Welded DIN 1626 St.37.0
Welded DIN 1626 St.52.2
Seamless DIN 1629 St.37.0
Seamless DIN 1629 St.52.2
Seamless DIN 17175 St.35.8/1
Seamless ASTM A106* Grade B
Seamless ASTM A333* Grade 6

New standard

Execution Norm Steel grade
Welded DIN EN 10217-1 P235TR2
Welded DIN EN 10217-3 P355N
Seamless DIN EN 10216-1 P235TR2
Seamless DIN EN 10216-3 P355N
Seamless DIN EN 10216-2 P235GH
Seamless DIN EN 10216-2 P265GH
Seamless DIN EN 10216-4 P265NL

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


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

Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.