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/ | 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 |
