A steel pipe (also called a hollow profile) is a tube with circular, square, oval or other cross section, whose wall is made of steel. Steel pipes are serve to carry liquid, gaseous or solid substances, or are used as static or constructive (building) elements. By the way, fire-welded pipes were manufactured for the first time in 1825, in Great Britain. Germany followed in 1845. The Mannesmann brothers developed in 1886 the cross-rolling process for the manufacture of seamless pipes. In 1889, the press-pull method according to Ehrhardt was then introduced. Steel pipes are thereby differentiated according to the following production processes:

Seamless steel pipes

These are produced through the perforation of solid material (blooms, billets, slabs etc.) and subsequent machining steps.

Longitudinally welded steel pipes

These are made of steel strips (steel strip), broad strip (coils), steel plates etc. formed by first bending the pipe body and the strip edges are then welded together in the longitudinal direction to form a closed steel pipe.

Spirally welded steel pipes 

These are made of steel strips helically wound and formed and accordingly helical-welded at the strip edges to form a closed pipe body. Steel pipes are standardised according to European standards based on the production system and are valid in Germany as DIN-standards.

Overview of the European or else German standards in the steel pipes segment

DIN 1615

Pipes welded made of unalloyed steels without special requirements

DIN 1626

Pipes welded made of unalloyed steels for special requirements

DIN 1628

Pipes welded made of unalloyed steels without particularly high requirements

EN 10216 (DIN 1629)

Pipes seamless round made of C-steel for special requirements

DIN 1630

Pipes seamless round made of C-steel for particularly high requirements

EN 10305-1 (DIN 2391)

Precision steel pipes seamless with particular dimensional precision

EN 10305-4 (DIN 2391)

Hydraulic cable ducts seamless with particular dimensional precision

EN 10305-2 (DIN 2393)

Precision steel pipes welded, cold drawn, with higher level of precision

EN 10305-3 (DIN 2394)

Precision steel pipes welded, dimensioned rolled, calibrated 

DIN 2413

Steel pipes. Calculation of wall thickness against internal pressure

EN 10255-M (DIN 2440)

Steel pipes. Pipes thread cut medium heavy execution

EN 10255-H (DIN 2441)

Steel pipes. Pipes thread cut heavy execution (steam pipes)

DIN 2442

Threaded pipes with quality specification. Nominal pressure 1 to 100

EN 10240 (DIN 2444)

Zinc coatings made of steel pipes. Quality standard for hot-dip galvanising of steel pipes

DIN 2445 Teil 1

Seamless steel pipes for dynamic loads. Hot formed pipes, nominal pressures 100 to 400

DIN 2442 Teil 2

Seamless steel pipes for dynamic loads. Precision steel pipes, nominal pressures 64 to 400

EN 10210 (DIN 2448)

Steel pipes seamless

EN 10219 (DIN 2458)

Welded steel pipes

DIN 17120

Pipes welded made of construction steels simple quality

DIN 17121

Pipes round seamless made of steel for general purposes in steel constructions

DIN 17172

Steel pipes for the transport of flammable liquids and gas

DIN 17173

Steel pipes seamless for low temperatures

DIN 17174

Pipes seamless made of fine grained construction steels

EN 10216-2 (DIN 17175)

Pressure boiler pipes seamless made of resistant to annealing steels 

EN 10217-2 (DIN 17177)

Pressure boiler pipes welded

DIN 17178

Pipes round welded made of fine grained construction steels for special applications

DIN 17179

Pipes round seamless made of fine grained construction steels for special applications


The American National Standards Institute, abbreviation ANSI manages and coordinates the standardisation system for the private sector in the U.S. This is a non-profit organization that is supported by various private and public organisations. The ANSI itself does not develop standards, but instead facilitates their development by establishing consensus among qualified groups. ANSI also ensures that guiding principles such as consensual ability, expediency and openness are observed by the affected groups. These standards are then categorised either as application standards or as design standards.


The American Petroleum Institute (abbreviation API) is the largest advocacy group in the oil and gas industry in the U.S., which moreover also extends to cover the petrochemical industry. The technical guidelines issued by the API are comparably comprehensive and exacting. The guidelines are not developed by independent bodies, but instead drawn up by professionals from industry companies that work together in the advocacy group




Learn more about DIN standards, the different API specifications or the difference between seamless and welded steel pipes.




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