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Boiler tubes for pressure equipment (high temperature)

Application examples:

  • central heating systems (as elements of central heating installations for transporting hot water from the boiler to radiators);
  • industrial installations (for transporting hot water or steam);
  • solar collectors (for transporting hot water to central heating systems);
  • heating installations (to transport hot water or steam to provide heat to buildings);
  • steam systems (for transporting steam to generate electricity or for technological processes);
  • chemical installations (for the transport of chemical liquids or steam).
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Standards

EN 10216-2 Seamless steel tubes for pressure purposes. TDC. Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties.
EN 10305-1 (upon agreement) Steel tubes for precision applications. Part 1: Seamless cold drawn tubes.
DIN 2391-1 (upon agreement) Seamless precision steel tubes. Part 1: Dimensions. Part 2: TDC.
DIN 17175 Seamless steel tubes for elevated temperatures.

Steel grades

according to EN: P195GH, P235GH, P265GH, 16Mo3, 14MoV6-3, 10CrMo5-5+NT, 10CrMo9-10, 11CrMo9-10+QT, 13CrMo4-5, 25CrMo4, X10CrMoVNb9-1, X11CrMo5+I, X11CrMo5+NT1, X11CrMo5+NT2

+N = normalized
+NT= normalized + tempered
+QT= quenching + tempered
+I = izotermical annealed

according to DIN: 10CrMo9 10, 13CrMo44, 14MoV63, 15Mo3, 17Mn4, 19Mn5, St35.8, St45.8, 10CrMo9 10, 13CrMo44, 14MoV63, 15Mo3, 17Mn4, 19Mn5, St35.8, St45.8

Steel designation according to EN
– non-alloy steel:
P – steel for pressure equipment
235 – minimum yield strenght in N/mm2
GH – high temperature
– alloy steel designated according to chemical composition

Steels for work at high temperatures – read more

Średnica zewnętrzna
D [mm]

Dopuszczalne odchyłki
średnicy zewnętrznej D

Dopuszczalne odchyłki grubości ścianki T
w zależności od stosunku T/D

≤ 0,025

> 0,025
≤ 0,050

> 0,050
≤ 0,10

> 0,10

D ≤ 219,1

± 1 % lub ± 0,5 mm w zależności od tego, które większe

± 12,5 % lub 0,4 mm w zależności od tego, które większe

D > 219,1

± 20 %

± 15%

± 12,5 %

± 10 % *

* For D ≥ 355,6 mm local deviation above the upper wall thickness of further 5% is allowed.

Tolerances of outside diameter D and wall thickness T for cold finished tubes:

D: ± 0,5 %, min ± 0,3 mm
T: ± 10 %, min ± 0,2 mm

Exact length tolerances:

L ≤ 6000 mm: 0 + 10 mm
6000 mm < L ≤ 12 000 mm: 0 + 15 mm L > 12 000 mm: upon agreement

Straightness

< 0,0015 of pipe length (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