DIN 1629 carbon seamless steel pipes

DIN 1629 is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.

The main products of steel grade is DIN1629 ST37.0, DIN1629 ST44.0, DIN1629 ST52.0

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.
The main products of steel / steel grade: DIN1629 (ST37.0, ST44.0, and ST52.0) Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.

Size range (mm):
Out diameter: 10-324mm
Wall thickness: 1-30mm
Length: 14000mm max

Grade list of DIN1629:
DIN1629 ST37.0
DIN1629 ST44.0
DIN1629 ST52.0

Note:
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 (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

Please note the meaning of below abbreviation in table 2:

HR----Hot Rolled
CW----Cold Worked
SR----Stress Relieved
A----Annealed
N----Normalized

Term	Symbol	Explanation
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

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DIN 1629 carbon seamless steel pipes