BS EN 10255 Non-alloy steel tubes suitable for welding and threading Technical delivery conditions
pipe fittings materials data
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JIS G3460 Steel pipes used for piping at extremely low temperatures of freezing point or under
1 Scope
This document specifies the requirements for circular non-alloy steel tubes suitable for welding and threading and provides a number of options for the finish of tube ends and coatings. This document covers tubes of specified outside diameter 10,2 mm to 165,1 mm (thread size 1/8 to 6) in two series, medium and heavy, and three types of designated thicknesses.
NOTE Tubes manufactured according to this document can be used for the conveyance of fluids as well as for other applications.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
The requirements of this European Standard rule when they differ from those in the standards and documents referred to below:
EN 10002-1, Metallic materials: Tensile testing – Part 1: Method of test at ambient temperature
EN 10020, Definition and classification of grades of steel
EN 10021, General technical delivery requirements for steel and iron products
EN 10027-1, Designation systems for steel – Part 1: Steel names, principal symbols
EN 10027-2, Designation systems for steels – Part 2: Numerical system
EN 10204, Metallic products – Types of inspection documents
EN 10232, Metallic materials – Tube (in full section) – Bend test
EN 10233, Metallic materials – Tube – Flattening test
EN 10240, Internal and/or external protective coatings for steel tubes – Specification for hot dip galvanized coatings
applied in automatic plants
EN 10241, Steel threaded pipe fittings
EN 10242, Threaded pipe fittings in malleable cast iron
EN 10246-1, Non destructive testing of steel tubes – Part 1: Automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness EN 10226-1 Pipe threads where pressure-tight joints are made on the threads – Part 1: Taper external threads and parallel internal threads – Dimensions, tolerances and designation.
prEN 10226-2, Pipe threads where pressure-tight joints are made on the threads – Part 2: Taper external threads and taper internal threads – Dimensions, tolerances and designation.
EN 10266:2003, Steel tubes, fittings and structural hollow sections – Symbols and definitions of terms for use in product standards.
BS 1387:1985 has been withdrawn and replaced with the European standard EN 10255:2004 (implemented by UK national standard body as BS EN 10255:2004 "Non-alloy steel tubes suitable for welding or threading"). The table below gives the corresponding types in BS 1387 and EN 10255.
| EN 10255 L | |
| EN 10255 L1 | |
| EN 10255 L2 | BS 1387 Light |
| EN 10255 Medium | BS 1387 Medium |
| EN 10255 Heavy | BS 1387 Heavy |
Dimensions and weight of steel tubes according the British Standard - BS 1387:1985 "Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads" can be found in the table below:
| 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 | |||
The standard is applicable to tubes of nominal size DN8 to DN150 in light, medium and heavy thickness.
- The BS 1387:1985 specification for screwed and socket steel tubes and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads.
C&N Huitong group can produce pipe fittings of such materials :
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