Seamless tubes for heat exchangers

We offer a wide range of solutions for heat exchanger manufacturers within the following parameters:

Dimensions of heat exchanger tubes


OUTER DIAMETER (OD)	0.500 - 3.000 inch 12.7 - 76.2 mm
WALL THICKNESS (WT)	0.035 - 0.220 inch 0.89 - 5.52 mm

. Tubes for pressure equipment, used at higher temperatureare delivered according to

ASTM A/SA 179	tube sizes acc. to ASTM / ASME standard.

DIN 28180	tube sizes acc. to DIN standard


cold drawn tubes hot rolled tubes	tube sizes acc. to European standards, tube sizes acc. to EN 10 216


JIS	sizes - Japanese std/heat exchangers

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.

Types of steel for heat exchanger tubes


EN 10216-2	P235GH, 16Mo3 Marking system for steel grades according to EN


ASTM A 179 ASTM A 161	A179 Grade C, Grade T-1
ASTM A 335	Grade T12

DIN 1629 DIN 17175 DIN 17173	St 37.0, St35.8, 15Mo3, TTSt35N

Chemical composition and mechanical properties of steels acc. BS, CSN, STN, NFA, UNI, GOST and JIS

Tubes length destined of heat exchanger tubes

Upon request the heat exchanger tubes may be supplied in length up to 20 meters.

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Ends of heat exchanger tubes


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

Markings of the tubes and tube bundles


(a) Tubes are marked by spraying the agreed upon data. (b) Tube bundles are marked with labels with the agreed upon data.

Packaging of heat exchanger tubes

(a) tubes bound with a steel band that has a paper underneath

(b) tubes wrapped in plastic sheets, burlap,

(c) tubes in wooden crates.

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

Testing of heat exchanger tubes

- prescribed mechanical tests,
- leak tightness test by eddy current,
- hydrostatic testing,
- ultrasound testing.

Certified test reports for heat exchanger tubes


ASTM / ASME A450

EN 10204: for EN 10297	nonspecified 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, 3.1. B

Straightness of heat exchanger tubes

Straightness deviation for the whole length of a tube L can not exceed value of 0.0015 x L. In conversion to the 1 meter length it can not exceed 3 mm.

Condition of delivery and surface of tubes

Tubes are supplied according to agreed standards. The cold drawn tubes after the final forming go through thermal processing in shielding gas – normalizing.

Surface protection of heat exchanger tubes

The inner and outer surface is protected by a light oil application. Upon request it may be protected with and easy removable oil application on the outer side. The tube ends may be enclosed by a plag.

STEEL TUBES categories