Hollow structural section

A steel pipe (also hollow section ) is a tube of circular, square, oval or other cross section, whose wall is made of steel. Steel pipes are used to carry liquid, gaseous or solid substances, or be used as a static-structural elements.

There are steel tubes of small diameters (brake lines, hydraulic lines, etc.) up to larger diameters of more than one meter ( pipeline systems, etc.)

Steel pipes according to their method of manufacture divided into:

  • Seamless steel tubes. These are ( etc. blooms, billets, slabs ) generated by the piercing of solid material and subsequent processing steps.
  • Longitudinally welded steel pipes. They are made ​​of steel strips ( steel strips ), broadband ( coil ) steel sheets and so formed by first bending the tube body and the strip edges are then welded together in the longitudinal direction to form a closed steel tube.
  • Spiral welded steel pipes. They are helically wound steel strip, formed and welded in accordance with a helical line at the strip edges to form a closed tubular body.

History

1825 fire welded pipes were first produced in England, Germany followed in 1845. Reinhard and Max Mannesmann developed in 1886 the cross-rolling process for the production of seamless pipes. The press-pull method according to Ehrhardt was introduced in 1889.

Standardization

Steel pipes are standardized according to European standards by the production system. The following standards are currently valid:

  • EN 10210 - Hot finished structural hollow sections of non-alloy steel construction and fine grain steels (two parts) - formerly DIN 17120 DIN 17125 ..., DIN 59410
  • EN 10219 - Cold formed welded structural hollow sections of non-alloy steel construction and fine grain steels (2 parts) - formerly DIN 17119, DIN 17120, DIN 17123, DIN 17125, DIN 59411
  • EN 10305 - Steel tubes for precision ( six parts) - formerly DIN 2385, DIN 2391, DIN 2393 ... DIN 2395
  • EN 60423 and EN 61386 for steel armored pipes ( Stapa pipes ), which are used in electrical installation

All of the above European standards are valid in Germany as DIN standards.

Hydraulics Slab (casting) Cable gland
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