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7. DIN flange standard

DIN 2634 Welding Neck Flanges

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Descripton

DIN 2634 is a type of welding neck flange according to German standard (DIN). This is part of the DIN standard system for flanges, widely used in industry to connect pipes, valves and equipment in the fluid transmission system.

Applications

  • Mainly used to connect pipe sections together in the fluid transmission system.
  • Used in industries such as petrochemical, chemical, food and water processing.

Standards

DIN 2634 specifies the requirements for dimensions, materials, design and testing of duck-neck weld flanges. Including parameters for working pressure, test pressure, dimensional accuracy and other requirements to ensure safety and efficiency in use.

  • Type : Welding Neck Flange.
  • Material : Usually carbon steel, alloy steel and stainless steel, depending on the requirements of the specific application.
  • Size : There are many different sizes, from DN 10 to DN 2000 or higher, depending on product standards.
  • Pressure and temperature : Designed to withstand high pressure and temperature, suitable for the requirements of industrial systems.

DIN 2634 Welding Neck Flanges Dimensions and Thickness Chart

Size (inches) Outer diameter (mm) Inside diameter (mm) Thickness (mm) Number of holes Hole diameter (mm) Hole depth (mm)
1/2 95 14.3 14 4 14.2 8.4
3/4 105 20.6 14 4 14.2 8.4
1 115 27.7 14 4 14.2 8.4
1 1/4 140 36.1 16 4 18.2 10.4
1 1/2 150 42.9 16 4 18.2 10.4
2 165 53.6 16 4 18.2 10.4
2 1/2 190 69.8 18 4 18.2 10.4
3 210 79.4 18 4 18.2 10.4
3 1/2 230 88.9 18 8 18.2 10.4
4 255 102.4 20 8 18.2 10.4
5 280 127 20 8 22.2 12.4
6 320 154 22 12 22.2 12.4
8 380 202 22 12 22.2 12.4
10 445 254 25 12 26.2 14.4
12 520 305 25 16 26.2 14.4
14 585 356 27 16 26.2 14.4
16 650 406 27 16 30.2 16.4
18 710 457 30 16 30.2 16.4
20 775 508 30 20 33.2 18.4
24 900 610 33 20 33.2 18.4

Summary table of common materials used for DIN 2634 Welding Neck Flanges

Material Material code Classify Main features
Carbon steel RST37.2, C22.8, S235JR, P245GH Common materials, easy to process Good strength and toughness, suitable for many industrial applications.
Alloy steel 1.5415 (16Mo3), 1.7335 (13CrMo4-5) High heat resistance Withstands high temperatures and high pressures, commonly used in the energy and chemical industries.
Stainless Steel 1.4307 (X2CrNi18-9), 1.4404 (X2CrNiMo17-12-2) Anti-corrosion, acid resistant High strength and good corrosion resistance, suitable for applications in the food industry.

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