DIN 2440 Galvanized Steel Pipe with ISO Threads
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The DIN-2440 standard applies to medium-weight tubes suitable for screwing used in applications of medium pressure air and non-hazardous gases. The most common material is St33. 2(also known as S185) conforming to DIN 17100.
The DIN 2440 Steel Pipes have 185MPa minimum yield strength and 310MPa minimum tensile strength.
Application of DIN 2440 Pipe
This standard applies to threaded medium-weight tubes. They are suitable for nominal prassure 25 for liquids and rominal pressure 10 for air and non-hazardous gases.
Standards to be observed for DIN 2440 Pipe
DIN 2444 Zinc coatings on steel tubas; quality Standard for the hot galvanizing of steel tubes for installation
DIN 2999 Part 1 Whitworth pipe thraads for tubes and fittings; cylindrical internal thraad and conical extemal
thread; thread dimensions
DIN 17100 Steels for general structural purposes;quality specifications
DIN 50136 Testing of metallic materials;flattening test on tubes
DIN 2440 Pipe Thread type
Pipe thread Whitworth pipe thread conforming to DIN 2999 Part 1, taper 1 : 16.
Material grade
Material St 33-2 conforming to DIN 17 100, material number 1.0035. In general, tubes conforming to this Standard shall be suitable for fusion welding. Neither the crystalline condition nor any Variation in hardness occurring over the circumference and brought about by the manufacturing process may impair the proper threading of the tubes.
Dimension Standard of DIN 2440 Threaded Steel Tubes
| Nominall Width | Conn- ecting nomin- al width of the flttings according to DIN 2950 and DIN 2980 |
Whit- worth- pipe threads according to DIN 2999 Part1 |
Tube | Screw thread | Corresponding socket according to DIN 2986 |
||||||||
| Outside diameterd1 |
Wall thick- nesss |
Weight | Theo- retical screw thread diameter d2 |
Threads per 25.4mm |
Usable screw thread length J min at a max. |
Distance of screw thread dlameter d2 from tube end |
Outside diameter |
Length | |||||
| Plain-end tube kg/m |
socketed tubekg/m |
a max. |
a min. |
min. | min. | ||||||||
| 6 | 1/8 | R 1/8 | 10.2 | 2.0 | 0.407 | 0.410 | 9.728 | 28 | 7.4 | 4.9 | 3.1 | 14 | 17 |
| 8 | 1/4 | R 1/4 | 13.5 | 2.35 | 0.650 | 0.654 | 13.157 | 19 | 11.0 | 7.3 | 4.7 | 15.4 | 25 |
| 10 | 3/8 | R 3/8 | 17.2 | 2.65 | 0.852 | 0.858 | 16.662 | 19 | 11.4 | 7.7 | 5.1 | 21.3 | 26 |
| 15 | 1/2 | R 1/2 | 21.3 | 2.65 | 1.22 | 1.23 | 20.955 | 14 | 15.0 | 10.0 | 6.4 | 26.4 | 34 |
| 20 | 3/4 | R 3/5 | 26.9 | 2.65 | 1.58 | 1.59 | 26.441 | 14 | 16.3 | 11.3 | 7.7 | 31.8 | 36 |
| 25 | 1 | R 1 | 33.7 | 3.25 | 2.44 | 2.46 | 33.249 | 11 | 19.1 | 12.7 | 8.1 | 39.5 | 43 |
| 32 | 1 1/4 | R 1 1/4 | 42.4 | 3.25 | 3.14 | 3.17 | 41.910 | 11 | 21.4 | 15.0 | 10.4 | 48.3 | 48 |
| 40 | 1 1/2 | R 1 1/2 | 48.3 | 3.25 | 3.61 | 3.64 | 47.803 | 11 | 21.4 | 15.0 | 10.4 | 54.5 | 48 |
| 50 | 2 | R 2 | 60.3 | 3.65 | 5.10 | 5.17 | 59.614 | 11 | 25.7 | 18.2 | 13.6 | 66.3 | 56 |
| 65 | 2 1/2 | R 2 1/2 | 76.1 | 3.65 | 6.51 | 6.63 | 75.184 | 11 | 30.2 | 21.0 | 14.0 | 82 | 65 |
| 80 | 3 | R 3 | 88.9 | 4.05 | 8.47 | 8.64 | 87.884 | 11 | 33.3 | 241 | 17.1 | 95 | 71 |
| 100 | 4 | R4 | 114.3 | 4.5 | 12.1 | 12.4 | 113.030 | 11 | 39.3 | 28.9 | 21.9 | 122 | 83 |
| 125 | 5 | R 5 | 139.7 | 4.85 | 16.2 | 16.2 | 138.430 | 11 | 43.6 | 32.1 | 25.1 | 147 | 92 |
| 150 | 6 | R 6 | 165.1 | 4.85 | 19.2 | 19.8 | 163.830 | 11 | 43.6 | 32.1 | 25.1 | 174 | 92 |
| 1) Referred to an average length of 6m | |||||||||||||
DIN 2440 Delivery
Tubes at delivery In manufacturing lengths without pipe thread and without socket. If another ferm of supply is desired, the designation shall be supplemented as follows: for supply with taper thread at both ends: “with pipe thread”; for supply with taper thread at both ends and one socket screwed on: “with socket”. Example of designation for the tube with taper thread at both ends referred to in clausa 3: Threaded tube DIN 2440 – DN 40 – seamless B with pipe thread,
Finish
According to the order the finish of the tubes supplied shall be as follows:
| Surface | Symbol |
|---|---|
| Black | – |
| Black, suitable for galvanizing in accordance with subclause 10.3 | A |
| Galvanized as specified in DIN 2444 | B |
| Non – metallic protective coating outside | C |
| Non – metallic protective coating inside | D |
Marking
Welded threaded tubes in nominal sizes 10 to 150 are to be marked at approximately 1 m intervals with the manufacturer’s trademark in a durable and readily recognizable
Technical delivery conditions
Pipe threads
The pipe threads shall correspond to DIN 2999 Part 1, the pipe thread diameter dz being referred to as the diameter measured at distanca (I from the tobe end over the crests of the pipe thread. The last threads at the tube end may be incomplete.
Sulface
The tubes shall have a smooth outside and inside surface consistent with the kind of manufacture. Slivers, scabs, foliations and the like have to be removed. This however shall not cause the wall thickness to go below the permissible deviation. 10.2.1 In the case of welded tubes, the weld shall Show full Penetration and be devoid of any major nonmetallic inclusions and other defects. On the inside there shall be no evidente of droplets of weld metal having penetrated. The height of the welding burr on the inside shall not exceed 60% of the nominal wall thickness. The extemal welding burr (upset beadl shall in all casas be removed from tubes electrically welded with pressure.
Suitability for galvanizing
(Symbol for erdering purposes: A) Over and above the requirements with regard to the finish as specified in subclause 10.2, the reinforcement of the inher welding burr shall not exceed 0.3 mm + 0.05. s in the case of welded tubes which are suitable for galvanizing in accordance with DIN 2444. The welding burr shall not be fissured. 10.4 Lengths The tubes arc normally supplied in manufacturing lengths. (L 10.4.1 The usual manufacturing lenghts for welded tubes shall be: 6m+‘~rnm According to occurrence, up to 6 % of the quantity delivered tan be supplied in lengths beween 5 m and 5.95 m, saparately bundled. 10.4.2 The usual manufacturing lengths for seamless tubes shall be: 6mrlm According to occurrence, up to 10% of the quantity delivered tan be supplied in lengths of more than 4 m to below 5 m or of more than 7 m to below 8 m, separat& bundled in each case. 10.43 Supply of the tubes in other types of length is to be agreed separately. e.g. exact lengths.
DIN 2440 is a German standard that specifies seamless and welded steel pipes designed for high-pressure and medium-pressure applications. These pipes are commonly used in fluid transport, gas pipelines, steam systems, and general mechanical applications.
