Seamless steel tubes for pressure equipment, used at ambient temperatures

We offer a wide range of solutions for power industry within the following parameters:

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 higher temperatureare delivered according to
EN 10216-1,
(BS 3060, DIN 2448,
NF A 49-112, 49-210,
STN and ČSN 42 5715, 42 5716,
PN-H 74219, UNI 7287)
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,

JIS G3454, G3455

sizes - japanese std/high temperature
sizes - japanese std/heat exchangers

EN 10 305-1

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 for tubes intended for pressure and thermal equipment

EN 10216-1P195TR1, P235TR1, P265TR1,
P195TR2, P235TR2, P265TR2.
Marking system for steel grades according to EN


Grade A, Grade B,
Chemical composition and mechanical properties of steels acc. DIN, BS, NFA, UNI, GOST, TU, PN-H and JIS

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, at least, 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 having weight of 300 – 3 500 kg.

Tube testing

The group of TR1 quality is usually tested by a nonspecified test. The group of TR2 quality is always tested by a specified test.

The main difference in the mandatory testing between the TR1 and the TR2 is the fact, that in the TR2 quality the testing is done by blow bending test at 0°C temperature and as the optional test at this quality it can be agreed to do the nondestructive test as a proof of longitudinal defects.

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 0.0015 multiple 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

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

Boiler tubes - used at ambient temperaturesSeamless steel tubes for pressure equipmentSeamless Boiler Steel Tubes