Seamless tubes for pressure equipment used at low temperatures

The steels used for these tubes have susceptibility to failure when used in low temperatures. We offer a wide range of solutions for low temperature applications.

Tube dimensions and tolerances for pressure equipment

OUTER DIAMETER (OD)10.2 - 139.7 mm
(from 26.9 mm manufactured as hot rolled)
WALL THICKNESS (WT)0.5 - 16.0 mm
(from 2.6 mm manufactured as hot rolled)
Tubes for pressure equipment, used at low temperatureare delivered according to
EN 10216-4,
(BS 3600, DIN 2448,
NF A 49-215,
STN and ČSN 42 5715, 42 5716,
PN-H 74219, UNI 4991)
tube sizes acc. to European standards

GOST 8732

tube sizes acc. to Russian standards


tube sizes acc. to ASTM standard
tube sizes acc. to ASME standards,

EN 10 305-1
(DIN 2391-1
STN and ČSN 42 6710, 42 6711)

tube sizes for precision steel tubes.

Means of tube production – hot rolling or cold forming depends upon the standards, tube dimensions and the agreement when ordering the tubes. The tube tolerances meet the appropriate standards and requirements.

Steel tubes for low temperatures

EN 10216-4P215NL, P265NL
Marking system for steel grades according to EN

ASTM A/SA 333 (A999)

Grade 1, 3, 6, 7
ASTM A/SA 334 (A1016)
ASTM A/SA 524 (A530)
Grade 1, Grade 6,
Grade II,
Chemical composition and mechanical properties of steels acc. DIN, BS, NFA and UNI

Length of seamless boiler tubes

Length [m]for sizes [mm]
5 – 6 OD < 60.3
5 – 6 or 10 – 14OD => 60.3 and WT < 7.1
5 – 6 OD => 60.3 and WT => 7.1
Longer tubes (22 - 24 meters) can be supplied upon agreement
Types of supplied length of tubes are:(a) random length,
(b) fixed length ± 500 mm,
(c) exact length
L < 6 m 0 + 10 mm
L = 6 - 12 m 0 + 15 mm.
L > 12 m + upon agreement


Tube ends

The ends are vertical to the longitudinal
axis and are without burrs.
ends of seamless pipes

The tubes with deburred ends
or ends customized for welding.
ends of seamless pipes customized for welding

Deburring applies to
Tube OD26.7 - 114.3 mm
    Tube ends
Tube WT 3.2 - 12.5 mm
Tube lengths4 - 13 meters
Deburring angle, a30°+ 5 and 37°± 2.5
Dimension, c1.6 ± 0.8 mm

Markings of the tubes and tube bundles

(a) The tubes with outside diameter up to 51 mm may be marked by a label attached to the tube bundle,
(b) Larger tubes must, as a minimum, have markings at one end of the tube with the necessary data - producer name , standard, steel grade, test category, heat no, inspector's mark, identification number. Additional marking upon agreement.

Packaging of seamless boiler tubes

The tubes are supplied in packages with a circular or hexagonal outline with weight of 300 – 3 500 kg.

Tube testing

Only specific testing.

Testing comparison DIN 17175 and EN 10216 – 2:
EN - testing category
DIN - quality class
Non–alloy steels: I or III, class TC1 or TC2
Alloy steels: – III, class TC2

Certified test reports for tubes

EN 10204: for EN 102943.1 specific testing
EN 10204: for EN 10297nonspecified testing (only the mandatory tests), 2.2
specified testing – 3.1.B
after agreement - 3.1.A, 3.1.C, 3.2
DIN 50049, 2.2 or 3.1.B,
STN 42 0250, ČSN 42 0250,

Straightness of tubes

Allowed straightness is 0.15 % of the tube length, for 1 meter length the allowed straightness is 3 millimeters.

Condition of delivery and surface of boiler tubes

Condition of the tubes meets the requirements of the appropriate standards, i.e. the tubes go through normalized forming or after cold forming goes through normalized annealing. The tube surface meets the standards’ requirements and the means of manufacturing.

Seamless boiler tubes surface protection

The tubes may be supplied without temporarily preservation of the surface or with an agreed upon preservative. While ordering, it is necessary to agree upon the method and means of temporarily protecting the surface of the tubes during transportation and storage.
Related links

Steel tubes application pre-insulated pipelines - Fintherm 1Steel tubes application pre-insulated pipelines - Fintherm 2Steel tubes application pre-insulated pipelines - Fintherm 3