DIN 1629 carbon seamless steel pipes

is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.

DIN 1629 applications the overheated boilers, as minimum thickness ferrite and seamless steel pipes, and as heat exchangers via austenitic pipes.

Application:
It is used for manufacturing pipeline,vessel,equipment,pipe fittings.

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.

Chemical Compositions(%) of DIN1629
Grade C Si Mn P S
ST37.0 ≤0.17 / / ≤0.040 ≤0.040
ST44.0 ≤0.21 / / ≤0.040 ≤0.040
ST52.0 ≤0.22 ≤0.55 ≤1.70 ≤0.040 ≤0.035
Mechanical Properties of DIN1629
Grade Yield Strength
(Mpa)
Tensile Strength
(Mpa)
Elongation
(%)L
Elongation
(%)T
ST37.0 ≥235 350-480 25 23
ST44.0 ≥275 420-550 21 19
ST52.0 ≥355 500-650 21 19

Size range(mm):

  • Out diameter:10-324mm
  • Wall Tickness:1-30mm
  • Length:14000mm max

Elevated temperature upper yield stress values of DIN 1629 Steel Pipe
Steel Grade Yield stress value by working temperature(Thickness increasing)
50℃ 200℃ 250℃ 300℃
St 37 235-215 185-170 165-150 140-130
St 44 275-255 215-200 195-180 165-155
St 52 355-335 248-230 225-210 195-185

Grade list of DIN1629:

Note:

  • DN — Nominal Diameter
  • NPS —Nominal Pipe Size
 Please note the meaning of below abbreviation in table 2:
  • HR—-Hot Rolled
  • CW—-Cold Worked
  • SR—-Stress Relieved
  • A—-Annealed
  • N—-Normalized