DIN 1629 carbon seamless steel pipes

DIN 1629 Seamless Steel pipe Of Non Alloys Steels are made of unalloyed steels, it's main grades are St 37.0, St44.0, St52.0.

DIN 1629 carbon seamless steel pipes
DIN 1629 carbon seamless steel pipes

Din 1629 seamless steel pipes application fields are: chemical plant, vessels, pipework construction and for common mechanical engineering purposes. Normally DIN 1629 standard are manufactured with no limiting working pressure values. Working temperature is limited below 300℃.

DIN 1629 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.

It is used for manufacturing pipeline,vessel,equipment,pipe fittings.
The main products of steel / steel grade:

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

Size range(mm):

DN — Nominal Diameter
NPS —Nominal Pipe Size

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
Tensile Strength
ST37.0 ≥235 350-480 25 23
ST44.0 ≥275 420-550 21 19
ST52.0 ≥355 500-650 21 19
Please note the meaning of below abbreviation in table 2:

Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.


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