DIN 2440

DIN 2440 is the German industrial standard for steel tubes that specifies the technical requirements for medium-weight threaded steel tubes

DIN 2440 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.

There are different forms to the pipes such as polished, annealed and pickled, bright and annealed types. The Carbon Steel DIN 2440 St 33-2 Seamless Tubes can come with different pipe ends such as plain end, beveled end, threaded pipe and tube types. The applications are in oil, gas, fluid transfer lines and in heat exchanger and boiler components. The DIN 2440 Grade St 33-2 Round Pipes are the most used ones where the other forms such as square pipes are available. The chemical composition of the pipes contains carbon, silicon, manganese, chromium, nickel and molybdenum. The DIN 2440 Steel Pipes have 185MPa minimum yield strength and 310MPa minimum tensile strength. Please feel free to contact us for a full price list and other information on the DIN 2440 ST33.2 Carbon Steel Tube products.

DIN 2440 Threaded Steel Tubes have internal threads that permit easy and speedy, leakproof connections. Threaded components like the din 2440 st 35 pipes are used in areas that cannot be welded. In some industries, the use of welding to connect a tube to fittings or flanges could cause undesirable flares or explosions, which are hazardous to both the application and the environment. The internal threads in the din 2440 Steel pipe aid in easy mounting or connectivity to a piping system without causing any accidents. Therefore, several industries, including the oil and gas industries may use these din 2440 st33 pipes for connectivity. Another reason that many businesses have carbon steel pipes in grade din 2440 st 33.2 as a part of their piping system is that they have good hardness properties. To improve these properties, often buyers place in an order for carburization or nitriding to be carried out on the carbon steel din 2440 tube. Both these processes ensure that the tubes become hard without becoming brittle.

Material Specification of DIN 2440

DIN 2440 Grade St 33-2 Carbon Steel Seamless Tubes and DIN 2440 st 35 Steel pipe with smooth tube ends


Nominal Diameter (ND): 6, 8, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125 mm (1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2, 2 1/2, 3, 4, 5 inch)

Outside Diameter (OD): 10,2 - 139,7 mm

Wall Thickness: DIN 2440: 2 - 4,6 mm;
DIN 2441: 2,65 - 5,40 mm

Dimension Standard of DIN 2440

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 Steel Tubes Sizes

DIN 2440
  DN Zoll d s kg/m
          schwarz verzinkt
  8 1/4 13.5 2.35 0.65 0.68
  10 3/8 17.2 2.35 0.85 0.89
  15 1/2 21.3 2.65 1.22 1.27
  20 3/4 26.9 2.65 1.58 1.65
  25 1 33.7 3.25 2.44 2.55
  32 1 1/4 42.4 3.25 3.14 3.28
  40 1 1/2 48.3 3.25 3.61 3.77
  50 2 60.3 3.65 5.10 5.33
  65 21/2 76.1 3.65 6.51 6.80
  80 3 88.9 4.05 8.47 8.85
  100 4 114.3 4.5 12.10 12.64

Threaded tube DIN 2440 Wall Thickness

ND Outside Diameter, mm OD Tolerances, mm Wall Thickness, mm (±12,5%)
inch mm DIN 2440 DIN 2441
1/8 6 10,2 + 0,4; - 0,4 2,00 2,65
1/4 8 13,5 + 0,5; - 0,3 2,35 2,90
3/8 10 17,2 + 0,5; - 0,3 2,35 2,90
1/2 15 21,3 + 0,5; - 0,3 2,65 3,25
3/4 20 26,9 + 0,4; - 0,4 2,65 3,25
1 25 33,7 + 0,5; - 0,4 3,25 4,05
1 1/4 32 42,4 + 0,5; - 0,4 3,25 4,05
1 1/2 40 48,3 + 0,5; - 0,4 3,25 4,05
2 50 60,3 + 0,5; - 0,4 3,65 4,05
2 1/2 65 76,1 + 0,5; - 0,8 3,65 4,50
3 80 88,9 + 0,6; - 0,9 4,05 4,85
4 100 114,3 + 0,7; - 1,2 4,50 5,40
5 125 139,7 + 1,1; - 1,2   5,40

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes