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Standard precision seamless steel tubes


Standard precision tubes are produced using the cold drawn process. Seamless steel tubes can be supplied as cut tubes and bent tubes. Cut tubes are designed especially for manufacturers of automotive components.

Precision steel tubes from our production satisfy the requirements for the following applications: components for the vehicle drivetrain, cars suspension systems, fuel injection, components for engine and transmission, components for body and chassis, vehicle control systems and others.

Standard precision seamless steel tubes

Dimensions of standard precision tubes

OUTER DIAMETER (OD)4,0 – 125,0 mm
WALL THICKNESS (WT)0,5 – 12,5 mm
EUROPEAN STANDARDSEN 10305-1,
DIN 2391,
BS 6323/4,
NF A 49-310, NF A 49-312,
UNI 7945,
STN/ČSN 42 6711,
STN/ČSN 42 6712,
PN-H 74240, PN-H 74220
RUSSIAN STANDARDSGOST 8734, 9567, 12132
AMERICAN
STANDARDS		ASTM A450 a A519
JAPANESE STANDARDSJIS G3445
Dimensional standard SIZES (OD x WT) Dimensional table
EN10305-14.0 x 0.5 – 120.0 x 13.0 mm
GOST121324.0 x 0.5 – 120.0 x 10.0 mm
DIN2391-14.0 x 0.5 – 120.0 x 13.0 mm
ČSN42 67114.0 x 0.5 – 120.0 x 13.0 mm
ČSN42 67124.0 x 0.5 – 120.0 x 13.0 mm
NF A49-3104.0 x 0.5 – 120.0 x 13.0 mm
NF A49-3124.0 x 0.5 – 120.0 x 13.0 mm
BS6323-44.0 x 0.5 – 120.0 x 13.0 mm
PN – H742404.0 x 0.5 – 120.0 x 13.0 mm
UNI79454.0 x 0.5 – 120.0 x 13.0 mm
GOST87344.0 x 0.5 – 120.0 x 10.0 mm
GOST95674.0 x 0.5 – 120.0 x 10.0 mm
ASTMA5196.35 x 0.51 – 120.65 x 9.53 mm [0.250 x 0.020 – 4.750 x 0.375 in] [25 – 3/8 GA]
JISG344515.9 x 1.2 – 114.3 x 9.5 mm

Steel grades for standard precision tubes

EN 10305-1E215, E235, E255, E355, E410, 26Mn5, 26Mo2, C35E, C45E, 25CrMo4, 42CrMo4, 25CrMo4
ASTM 519, SAE1-21008, 1010, 1012, 1015, 1016, 1017, 1018, 1019, 1020, 1021, 1022, 1025, 1026, 1030, 1035, 1040, 1045, 1050, 1518, 4130, 4140, 4142, 8617.
JIS G3445STKM11A, STKM12A, STKM12B, STKM12C, STKM13A, STKM13B, STKM13C, STKM14A, STKM14B, STKM14C, STKM15A, STKM15C, STKM16A, STKM16C, STKM17A, STKM17C, STKM18A, STKM18B, STKM18C, STKM19A, STKM19C, STKM20A
DIN 239St35, St45, St52.
Standard TDC Steel grade (open product) Dimensional standard
GOST8733 / 10508734
GOST12132 / 105012132
GOST8733 / 192819567
GOST21729 / 10509567
GOST8733 / 10508734
GOST8733 / 10508734
GOST21729 / 45439567
GOST8733 / 45439567
GOST12132 / 105012132
GOST12132 / 105012132
GOST8733 / 45439567
GOST8733 / 10508734
GOST12132 / 1928112132
GOST12132 / 105012132
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ASTMA519A519
ČSN42 026042 6712
ČSN42 026042 6711
STN42 026042 6711
STN42 026042 6711
ČSN42 026042 6711
ČSN42 026042 6712
ČSN42 026042 6712
STN42 026042 6711
ČSN42 026042 6712
ČSN42 026042 6711
ČSN42 026042 6712
ČSN42 026042 6712
STN42 026042 6711
STN42 026042 6711
ČSN42 026042 6712
ČSN42 026042 6711
STN42 026042 6711
ČSN42 026042 6712
ČSN42 026042 6712
STN42 026042 6712
ČSN42 026042 6711
STN42 026042 6711
ČSN42 026042 6711
STN42 026042 6711
STN42 026042 6712
STN42 026042 6712
STN42 026042 6712
BS6323-1,46323-4
DIN2391-22391-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
EN10305-110305-1
BS6323-1,46323-4
NF A49-31249-312
PN – H74240 / 8401974240
STN42 026042 6712
PN – H74240 / 8401974240
UNI79457945
NF A49-31049-310
ČSN42 026042 6711
BS6323-1,46323-4
PN – H74240 / 8402374240
PN – H74240 / 8401874240
EN10305-110305-1
STN42 026042 6712
NF A49-31049-310
PN – H74240 / 8401974240
PN – H74240 / 8402374240
PN – H74240 / 8402374240
PN – H74240 / 8401974240
UNI79457945
BS6323-1,46323-4
STN42 026042 6712
BS6323-1,46323-4
ČSN42 026042 6711
UNI79457945
STN42 026042 6712
STN42 026042 6712
PN – H74240 / 8401974240
NF A49-31049-310
BS6323-1,46323-4
PN – H74240 / 8402374240
NF A49-31249-312
UNI79457945
UNI79457945
DIN2391-22391-1
PN – H74240 / 8401874240
STN42 026042 6711
ČSN42 026042 6711
DIN2391-22391-1
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445
JISG3445G3445

Tolerances for standard precision tubes

Tolerances of the precision tubes are in accordance with the appropriate dimensional tables of standards. Usual value for the outside diameter (OD) is less than 0.5% of OD in no heat treatment process used. For the heat treated tubes, tolerance values are depended upon the relation of the wall thickness and the tube diameter (WT/OD) and are larger (up to a single or twofold).

In tolerances of the outside diameter (OD) the allowed deviation of circularity is included. When ordering based on the wall thickness, the tolerance is 10% from the wall thickness. Eccentricity of precision tube is included in the wall thickness tolerance.

Reduced tolerances for metrical sizes – European standards.

Length of the standard precision tubes

Maximum tubes length is 18 meters.

Types of supplied length are:

(a) random length, in the range of 3 – 7 (9) m,
(b) fixed length, ± 500 mm,
(c) exact length, – 0 / + x mm (x upon agreement),
(d) tubes can be supplied as cut tubes

Standard precision tube testing

Mandatory testing:
(a) cast / chemical analysis
(b) tensile test,
(c) dimensional inspecti,
(d) visual inspection of the tubes surface.

Optional testing:
(a) flattening test or drift expanding test,
(b) roughness measurement NDT to find longitudinal defects,
(c) eddy current (STN 01 5054, PRP 02-74, SEP 1925, ASTM E 309, EN 10246-3 Gr.E3),
(d) stray flux (STN 01 5047, ČSN 01 5047, SEP 1913, ASTM E 570, EN 10246-5 Gr.F3),
(e) ultrasound (STN 01 5028, ČSN 01 5028, SEP 1915, ASTM E 213, EN 10246-7 Gr.U3),
(f) NDT as a proof of tightness or leakage test by eddy current EN 10246-1.

Standard precision tubes ends

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

Standard precision 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 storiage.

Packaging of the standard precision tubes

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

Standard precision tubes are supplied in packages with a circular or hexagonal outline with maximum weight of 2 000 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

Marking of standard precision tubes and tube bundles

(a) without marking,
(b) marked with colored stripes on the tubes (tube bundles),
(c) marked with spray either by a white or black color using InkJet,
(d) marked by stamping the data (this applies to OD > 22 mm and WT >2.3 mm).

Bundles of tubes are marked with one or more labels with the required data.

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

Certified test reports for standard precision tubes

EN 10204
2.2 nonspecified testing (only mandatory tests),
3.1 specific testing,
3.2 after agreement .

Straightness of standard precision tubes

Straightness of the tubes is influenced by the mechanical properties of the tubes.


For material having the yield point ReH <= 500 MPa is straightness 0,0015 multiple of the tube length maximum, allowed straightness for one meter length is 1.5 milimeters.

For material with the yield point ReH > 500 MPa the allowable straightness for the whole length of the tube is 0.0020 multiple of the tube length, allowed straightness of one meter is 2 milimeters.

Delivery condition and precision tubes surface

Precision tubes are supplied in condition that is presented in the table below. It is marking for thermal processing according to EN 10305-1.

+C Cold drawn / hard. After the last cold forming no heat treatment.


+LC Cold drawn / soft. After the last heat treatment follows the cold drawing there is a light finishing pass.


+SR Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.


+A Annealed. After the last cold drawing process the tubes are annealed in a controlled atmosphere.


+N Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere.

Marking for material condition according to DIN 2391-2 and ASTM 519 may be found here.



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