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Tubes suitable for welding and threading


Seamless steel tubes for threading and welding are produced by hot rolling. Continuously cast blooms are semi-finished product that is used as the starting material for these tubes. Threaded tubes have a wide range of use especially in the construction field. They are used for water transfer and distribution of all kinds of liquids and gasses.

The limits for using this group of tubes as far as the level of pressure is concerned and the type of transfer media is used are given by the appropriate directives that are valid for pipeline construction, distribution and pipes. Tubes are made from carbon and alloyed steel.

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Tubes suitable for welding and threading

Tube dimensions for threading and welding

OUTER DIAMETER (OD)26,9 – 114,3 mm
WALL THICKNESS (WT)Light serie (L2, L1, L), Medium serie (M), Heavy serie (H)
EUROPEAN STANDARDSEN 10255, EN 10224
AMERICAN STANDARDSASTM, ASME A/SA 53
suitable for welding or threadingSeamless steel tubes17
Dimensional standard SIZES (OD x WT) Dimensional table
EN 10224 (10220) 10.2 x 0.5 – 139.7 x 16.0 mm Dimensional table
EN 10255 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
ASTM A53 10.3 x 1.24 – 114.3 x 13.49 mm [0.405 x 0.049 – 4.500 x 0.531 in] [1/8 – 4 NPS] Dimensional table
ASTM A795 10.3 x 1.24 – 114.3 x 13.49 mm [0.405 x 0.049 – 4.500 x 0.531 in] [1/8 – 4 NPS] Dimensional table
ASME SA53 10.3 x 1.24 – 114.3 x 13.49 mm [0.405 x 0.049 – 4.500 x 0.531 in] [1/8 – 4 NPS] Dimensional table
GOST 3262 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
Withdrawn standards They may still be used occasionally
BS 1387 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
DIN 2440 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
DIN 2441 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
DIN 2442 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
DIN 2460 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
NF A 49-115 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
UNI 6363 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
UNI 8863 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
PN – H 74220 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
STN 42 5710 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table
ČSN 42 5711 9.8 x 2.0 – 113.1 x 5.40 mm [1/8 – 4 NPS] [6 – 100 DN] Dimensional table

The types of steel destined for threaded tubes

EN 10224
EN 10255		L235, L275, L355
L195T, S195T
STN 42 025011 353
ASTM A 53
ASTM A 795		Grade A, Grade B.

suitable for welding or threadingSeamless steel tubes29
Standard TDC Steel grade (open product)
EN 10255 L195T
EN 10255 S195T
EN 10224 L235
EN 10224 L355
EN 10224 L275
ASTM A53/A530 Grade B
ASTM A795 Grade B
ASTM A53/A530 Grade A
ASTM A795 Grade A
ASME SA53/SA530 Grade A
ASME SA53/SA530 Grade B
GOST 3262 / 1050 10
Withdrawn standards They may still be used occasionally
BS 1387 1387
DIN 1629 St 52.0
DIN 2441 St 33-2
DIN 2440 St 33-2
DIN 1629 St 37.0
DIN 1629 St 37.0
NF A 49-115 TU 34-1
UNI 6363 Fe 510
UNI 6363 Fe 410
UNI 6363 Fe 360
UNI 8863 Fe 330
PN – H 74220 / 84023 R35
PN – H 74220 / 84023 R45
STN 42 0250 11 353
STN 42 0250 11 353
ČSN 42 0250 11 353
ČSN 42 0250 11 353

Lengths of tubes

Types of supplied length of tubes are:
(a) random
(b) fixed
(c) exact:
L = 2–6 m 0 +10 mm
L = 6–12 m 0 +15 mm
L > 12 m 0 + upon agreement

Testing of the tubes for threading

Tubes are tested with nonspecified test.

Tests:
(a) leak tightness (pressure 50 bar for 5 seconds or according to EN 10246–1),
(b) visual inspection,
(c) tensile test,
(d) bend test,
(e) flattening test.

Tubes surface protection

The pipes are supplied without temporary anticorrosion 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.

Ends of tubes

The tubes with deburred ends or ends customized for welding.
The tubes with deburred ends or ends customized for welding.
The ends are vertical to the longitudinal axis and are without burrs.
The ends are vertical to the longitudinal axis and are without burrs.

Deburring applies to:

Deburring
  • Tube OD: 19,0 – 90,0 mm,
  • Tube WT: 2,0 – 10,0 mm,
  • Tube lengths: 3 – 7 m,
  • Deburring angle, α (alpha): 30°+5°, 37,5°±2,5°, 45°±2,5°
  • Dimension, c: 1,6 ± 0,8 mm

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Tubes packaging

(a) tubes bound with a steel band,
(b) tubes wrapped in plastic sheets, burlap,
(c) tubes in wooden crates.

Tubes are bound with steel band into bundles with weight 1 000–3 500 kg.

Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed

Tubes and bundle marking

Tubes are marked by the manufacturers’ logo and a symbol of series, or color marked:
medium series – blue
heavy series – red

Bundles are marked with metal tag with required information

Marked by a label
Marked by a label
Marked with spray either by a white or black color using InkJet
Marked with spray either by a white or black color using InkJet
Marked by stamping the data
Marked by stamping the data
Laser marking
Laser marking

Certified test reports

EN 102042.1, 2.2
DIN 50049,
STN/ČSN 42 0250
2.1, 2.2


Straightness


Tubes are visually straight.
Max deviation 0.2 % of tube length.


Delivery condition and tubes surface


Usually the tubes are supplied as hot rolled. Only tubes with DN 6 -10, or possibly tubes of other dimensions may be supplied after an agreement as cold drawn tubes, and after forming, heat treated.

Surface of the tubes is appropriate to the way of production. Upon request, tube surface may be taken care of by a definite surface insulation (tar, PVC tape or extruded PVC according to DIN 30670).



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