EN 10255

EN 10255

A variety of choices for finishing tube ends and coatings are provided in this European Standard EN 10255, which specifies the criteria for circular non-alloy steel tubes that may be welded or threaded and gives a number of alternatives for finishing tube ends and coatings. This European Standard includes tubes with defined outer diameters ranging from 10,2 mm to 165,1 mm (thread sizes 1/8 to 6) in two series, medium and heavy, and three types of specified thicknesses. The outside diameters are stated in millimeters (mm). NOTE It is possible to utilize tubes that have been made in accordance with this specification for the conveyance of fluids as well as other uses.

EN 10255 – Non-Alloy Steel Tubes Suitable for Welding and Threading, and the Technical Delivery Conditions.

PRODUCT FEATURES

Steel Grades of EN 10255 Pipes

Dimensions and Sizes of EN 10255 Steel Pipes

The following table contains the dimensions and weight of steel tubes in accordance with the European standard EN 10255 “Non-Alloy Steel Tubes Suitable for Welding and Threading” and British Standard BS 1387:1985 “Specification for screwed and socketed steel tubes and tubulars, and for plain end steel tubes suitable for welding or screwing to BS 21 pipe threads”:

Nominal Bore

Outside Diameter

Thickness

Weight

Light

Medium/
Heavy

Light

Medium

Heavy

Light

Medium

Heavy

in

mm

mm

mm

mm

mm

mm

kg/m

kg/m

kg/m

1/4

8

13.6

13.9

1.80

2.3

2.9

0.515

0.641

0.765

3/8

10

17.1

17.4

1.80

2.3

2.9

0.670

0.839

1.020

1/2

15

21.4

21.7

2.00

2.6

3.2

0.947

1.210

1.440

3/4

20

26.9

27.2

2.30

2.6

3.2

1.380

1.560

1.870

1

25

33.8

34.2

2.60

3.2

4.0

1.980

2.410

2.940

1 1/4

32

42.5

42.9

2.60

3.2

4.0

2.540

3.100

3.800

1 1/2

40

48.4

48.8

2.90

3.2

4.0

3.230

3.570

4.380

2

50

60.2

60.8

2.90

3.6

4.5

4.080

5.030

6.190

2 1/2

65

76.0

76.6

3.20

3.6

4.5

5.710

6.430

7.930

3

80

88.7

89.5

3.20

4.0

5.0

6.720

8.370

10.300

4

100

113.9

114.9

3.60

4.5

5.4

9.750

12.200

14.500

5

125

140.6

5.0

5.4

16.600

17.900

6

150

165.1

5.0

5.4

19.700

21.300

Chemical Composition of EN 10255 Pipes

Grade

Chemical composition (%)

S195T

C

Mn

P

S

≤ 0.20

≤ 1.40

≤ 0.035

≤ 0.030

Mechanical Properties of EN 10255 Pipes

Grade

Mechanical Properties

S195T

Yield Strength (Mpa)

Tensile Strength (Mpa)

Elongation (%)

195

320-520

20

Tolerances of EN 10255 Piping

- Wall Thickness

  • ±10%. for M and H series & Type L;
  • -8% with the plus tolerance limited by the mass tolerance, for Types L1 and L2.

- Weight

  • ±7.5% on bundles of 10 tons or more, for M and H series and Type L;
  • +10%, -8% on individual tubes for Types L1 and L2.

- Straightness

  • Straightness shall not exceed 0.002 L.

EN 10255 and BS 1387 comparison table

Abolished and replaced by the European standard EN 10255: 2004 (adopted by the UK national standard body as BS EN 10255:2004 “non-alloy steel tubes suitable for welding or threading”), BS 1387:1985 has been retired. The kinds in BS 1387 and EN 10255 that correspond to each other are listed in the table below.

EN 10255 L

EN 10255 L1

EN 10255 L2

BS 1387 Light

EN 10255 Medium

BS 1387 Medium

EN 10255 Heavy

BS 1387 Heavy

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