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Tubes for pressure equipment of fine grain steels

Application examples:

  • energy installations (for the transport of high-pressure steam or para-hydrogen);
  • cooling systems (for transporting cooling water to cool equipment or technological processes);
  • chemical installations (for the transport of chemical liquids and gases);
  • steam systems (for transporting high-pressure steam);
  • industrial installations (for the transport of hot water, steam, chemical liquids and gases);
  • heating installations (for the transport of high-pressure steam or hot water);
  • gas installations (for the transport of natural gases and propane-butane).
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Standards

  • EN 10216-3 Seamless steel tubes for pressure purposes. TDC. Part 3: Non-alloy and alloy fine grain steel tubes.
  • EN 10305-1 (upon agreement) Steel tubes for precision applications. Part 1: Seamless cold drawn tubes.
  • DIN  17179 Seamless circular tubes of fine grain steel for special requirements. TDC.
  • DIN 2391-1 (upon agreement) Seamless precision steel tubes. Part 1: Dimensions. Part 2: TDC.

Steel grades

  • according to EN 10216-3: P275NL1, P275NL2, P355N, P355NH, P355NL1, P355NL2, P460N, P460NH, P460NL1, P460NL2
  • according to DIN 17179: StE255, StE285, StE355, StE420, StE460, WStE255, WStE285, WStE355, WStE420, WStE460, TStE255, TStE285, TStE355, TStE420, TStE460, EStE255, EStE285, EStE355, EStE420, EStE460
The fine grain steels are supplied in 4 types of quality:
Type Designation according to EN 10216-3Designation according to DIN 17179
Basic P-N StE
High temperature P-NH WStE
Low temperature P-NL1 TStE
Special low temperature P-NL2 EStE

Lengths

• D < 60,3 mm: 5-6 m
• D ≥ 60,3 mm / T < 7,1 mm: 5-6 m lub 10-14 m
• D ≥ 60,3 mm / T ≥ 7,1 mm: 5-6 m
• większe długości po uzgodnieniu

Exact length tolerances

• L < 6 m: 0 + 10 mm • 6 m ≤ L ≤ 12 m: 0 + 15 mm •  L > 12 m: upon agreement

Tolerance D (outside diameter)

hot finished tubes: D  ≤ 219,1 mm: ± 1 %, min ± 0,5 mm
cold finished tubes: ± 0,5 %, min ± 0,3 mm

Tolerance T (wall thickness)

hot finished tubes: D  ≤ 219,1 mm: ± 12,5 %, min ± 0,4 mm
cold finished tubes: ± 10 %, min ± 0,2 mm

Straightness

< 0,0015 of pipe lenght (below 3 mm per every meter of pipe length)

Dimensions

The tubes from 21.3 mm diameter and the wall thickness from 2.3 mm are supplied as hot rolled. The smaller diameter tubes are supplied as cold drawn and subsequently heat treated. Based on an agreement it is possible to deliver boiler tubes with dimensions and tolerances according to the dimensional specifications for precision tubes.

Dimensions and weight of seamless steel tubes according to EN 10220

Dimensions and weight of precision seamless tubes according to EN, DIN