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DIN 1629 Seamless Steel Tubes

DIN 1629 Seamless Steel Tubes

DIN 1629 seamless steel tubes DIN 1629 seamless circular unalloyed steel tubes subject to special requirements Steel grade: ST37.0, ST44.0, ST52.0 Delivery condition: Hot finished Size range: OD 70mm-610mm, WT 4mm-35mm Length: commerical length Dimension and tolerance: according to EN10216 Test:...

Description

DIN 1629 seamless steel tubes


DIN 1629 seamless circular unalloyed steel tubes subject to special requirements

Steel grade: ST37.0, ST44.0, ST52.0

Delivery condition: Hot finished

Size range: OD 70mm-610mm, WT 4mm-35mm

Length: commerical length

Dimension and tolerance: according to EN10216

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

Certification: PED(97/23/EC) and AD2000, Lioyd's register



Chemical composition

Steel grade
Elements content, Max, %
C
Mn
Si
S
P
Ni
Al
ST37.0
0.17
--
--
0.040
0.040
0.009
--
ST44.0
0.21
--
--
0.040
0.040
0.009
--
ST52.0
0.22
1.60
0.55
0.040
0.035
--
≥0.02


Mechanical properties

Steel grade

Min Yield strength, MPa for

S(wall thickness), mm

Tensile

strength Rm, MPa

Min Elongation A, %
S≤16
S>16, S≤40
S>40, S≤65Longitudinal direction

Transverse

direction

ST37.0
235
225
215
350-480
25
23
ST44.0
275
265
255
420-550
21
19
ST52.0
355
345
335
400-650
21
19


Tolerances

Outer diameter, mm
Outer diameter permissible deviation
Up to 100
±1% (but not less than ±0.5mm)
Above 100 up to 200
±1%
Above 200
±1%


Wall thickness permissible deviation
For OD up to 130mm

For OD above 130mm and up to

320mm and wall thickness S

For OD above 320mm
S≤2*Sn

S>2*Sn,

S≤4*Sn

S≤0.05OD

S>0.05OD,

S≤0.11OD

S>0.11ODS≤0.05ODS>4*Sn

S>0.05OD,

S≤0.09OD

S>0.09OD

+15%,

-10%

+12.5%,

-10%

+17.5%,

-12.5%

+15%,

-10%

±12.5%

+20%,

-15%

±9%

+15%,

-12.5%

+12.5%,

-10%


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