DIN 2440 Threaded Steel Tubes
DIN 2440 threaded steel tube designed for high-pressure and high-temperature environments.
DIN 2440 is the German industrial standard for steel tubes that specifies the technical requirements for medium-weight threaded steel tubes
DIN 2440 is the German industrial standard for steel tubes that specifies the technical requirements for medium-weight threaded steel tubes, also known as black and galvanized steel tubes or pipes. This standard was first published in 1962 and later revised in 1978.
The DIN 2440 standard covers a range of threaded steel tubes made from non-alloyed and low-alloyed steels, with diameters ranging from 20mm to 165mm and wall thicknesses ranging from 1.8mm to 6.3mm. These steel tubes are commonly used in the construction of pipelines and plumbing systems for conveying gas, air, water, and other fluids.
The technical requirements laid out in DIN 2440 include chemical composition, mechanical properties, dimensional tolerances, and testing methods, among others. For example, the standard specifies the maximum permissible carbon content of the steel tubes, which should not exceed 0.17%, and sets out the minimum values for tensile strength and elongation.
In addition, DIN 2440 also includes requirements for the surface finish of the steel tubes, particularly for galvanized tubes, which should have a uniform zinc coating to protect against corrosion.
DIN 2440 is an important industrial standard for steel tubes used in plumbing and pipeline systems, providing technical specifications and quality requirements for threaded steel tubes made from non-alloyed and low-alloyed steels.
DIN 2440 specifies seamless medium-weight threaded steel tubes primarily used for water, gas, steam and general structural applications.
Tubes are supplied in hot-rolled or annealed condition, with plain, beveled or threaded ends. The internal Whitworth thread allows leak-tight assembly without welding—an advantage in flammable or explosive environments. On request, carburizing or nitriding can be applied to further improve surface hardness without compromising toughness.
St 33-2 offers a minimum yield strength of 185 MPa and a minimum tensile strength of 310 MPa. Typical alloying elements include C, Si, Mn, Cr, Ni, Mo and Cu within limits suitable for forming and threading.
| Nominal Diameter DN (mm) |
Nominal Size (inch) |
Outside Diameter OD (mm) |
DIN 2440 Wall (mm) |
DIN 2441 Wall (mm) |
Weight kg/m |
Thread |
|---|---|---|---|---|---|---|
| 6 | 1/8" | 10.2 | 2.00 | 2.65 | 0.41 | R 1/8 |
| 8 | 1/4" | 13.5 | 2.35 | 2.90 | 0.65 | R 1/4 |
| 10 | 3/8" | 17.2 | 2.35 | 2.90 | 0.85 | R 3/8 |
| 15 | 1/2" | 21.3 | 2.65 | 3.25 | 1.22 | R 1/2 |
| 20 | 3/4" | 26.9 | 2.65 | 3.25 | 1.58 | R 3/4 |
| 25 | 1" | 33.7 | 3.25 | 4.05 | 2.44 | R 1 |
| 32 | 1¼" | 42.4 | 3.25 | 4.05 | 3.14 | R 1¼ |
| 40 | 1½" | 48.3 | 3.25 | 4.05 | 3.61 | R 1½ |
| 50 | 2" | 60.3 | 3.65 | 4.05 | 5.10 | R 2 |
| 65 | 2½" | 76.1 | 3.65 | 4.50 | 6.51 | R 2½ |
| 80 | 3" | 88.9 | 4.05 | 4.85 | 8.47 | R 3 |
| 100 | 4" | 114.3 | 4.50 | 5.40 | 12.10 | R 4 |
| 125 | 5" | 139.7 | 4.85 | 5.40 | 16.20 | R 5 |
| DN | Thread | Pitch (threads / 25.4 mm) |
Effective Ø (mm) |
Min. Thread Engagement (mm) |
|---|---|---|---|---|
| 6 | R 1/8 | 28 | 9.73 | 7.4 |
| 15 | R 1/2 | 14 | 20.96 | 10.0 |
| 25 | R 1 | 11 | 33.25 | 12.7 |
| 50 | R 2 | 11 | 59.61 | 18.2 |
| 100 | R 4 | 11 | 113.03 | 28.9 |
| DN | Nominal Size | OD (mm) | Wall (mm) | Black kg/m |
Galvanized kg/m |
|---|---|---|---|---|---|
| 15 | 1/2" | 21.3 | 2.65 | 1.22 | 1.27 |
| 25 | 1" | 33.7 | 3.25 | 2.44 | 2.55 |
| 50 | 2" | 60.3 | 3.65 | 5.10 | 5.33 |
| 100 | 4" | 114.3 | 4.50 | 12.10 | 12.64 |
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