Seamless Steel Pipe

DIN 1629 Steel Tube

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.

Steel Grade: ST37.0, ST44.0, ST52.0

Size Range(mm):

Out Diameter: 10-324mm

Wall Tickness: 1-30mm

Length: 14000mm max

Delivery Condition: Hot finished

Test: Cast analysis, tensile test, impact test, electromagnetic test, visual inspection

Standard

Specification

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


The main products of steel grade DIN 1629 are:

Din1629 ST37.0

Din1629 ST44.0

Din1629 ST52.0


DIN 2391 ST 37 can be processed as hot rolled, cold rolled, cutting, grinding, machining and forming operations. It has high impact strength due to which it can be used under high impact prone outdoor applications as well.

DIN 1629 ST 52 is a low-cost Low Carbon Steel Tubes with max 022 % carbon content easy to form and shape. It is suitable for gas fusion welding, arc welding, flash butt welding, electric pressure welding and gas pressure welding.

DIN 1629 part 3 is not only hard, but it also has high tensile properties, which is expected for structural components. It has good weldability properties with its pre-existing chemistry.


Chemical Composition:

Steel Grade

Type of deoxidization
(R, killed (including semi-killed)) (RR,fully killed)

Chemical Composition, % by mass

Symbol

Material Number

C

P

S

N¹)

Addition of nitrogen fixing elements
(e.g.not less than 0,020% Al total

St37.0

1.0254

R

0.17

0.040

0.040

0.009²)

St44.0

1.0255

R

0.21

0.040

0.040

0.009²)

St52.0³)

1.0421

RR

0.22

0.040

0.035

Yes


Mechanical Properties:

Steel Grade

Upper Yield Stress ReH
for wall thickness, in mm,

Tensile strength
Rm
N/mm²

Elongation(%) A5

Symbol

Material Number

up to 16

over 16 up to 40

over 40 up to 65

Longitudinal

Transverse

St 37.0

1.0254

235

225

216

350²) to 480

25

23

St 44.0

1.0256

275¹)

265¹)

255¹)

420²) to 550

21

19

St 52.0

1.0421

355

345

335

500²) to 650

21

19

1) For cold f inished tube in the NBK condition (annealed above the upper transformation point under shielding gas or in a vacuum), minimum values of yield stress lower than these valued by 20N/mm² are permitted.
2) For cold finished tubes in the NBK condition, minimum values of tensile strength lower than these values by 10N/mm² are permitted.


Tolerance Chart:

Execution

Size Range

OD Tolerance

Wall tolerance

Hot-rolled Tube

OD – 80 mmOD > 80 mmWall < 12 mmWall - 12 mm

± 0.4 mm± 0.5 % of OD

± 0.7 mm± (5 % x wallthickness + 0.1 mm

Hot-rolled peeled tube

All sizesWall < 12 mmWall - 12 mm

+ 0.25/- 0 mm

± 0.8 mm± (5 % x wall thickness+ 0.2 mm)

Cold Worked tubecold-rolled or cold-drawn

OD < 40 mmOD 40 - 80 mmOD > 80 Wall Thickness< 6 mm Wall Thickness6 - 8 mm Wall Thickness > 8

+ 0.30/- 0 mm*+ 0.35/- 0 mm*+ 0.40/- 0 mm*

± 0.30 mm± 0.35 mm± 0.40 mm

Process

The cold-drawn process used in manufacturing DIN 1629 stainless steel tubes involves pulling the material through a die to achieve the desired dimensions. This process enhances the mechanical properties and surface finish of the tubes, making them suitable for precision applications such as hydraulic cylinders.

Packing

  • OD 219mm and above (Loose) : Loose + pipe cap + two nylon slings

    OD 219mm and above (Loose) : Loose + pipe cap + two nylon slings

  • OD below 219mm (Bundled) :Hexagonal packing + steel belts bundled (3 steel belts at both ends & 2 steel belts in the middle) woven bag under the st

    OD below 219mm (Bundled) :Hexagonal packing + steel belts bundled (3 steel belts at both ends & 2 steel belts in the middle) woven bag under the st

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