DIN 2391 ST52 pipe is manufactured according to the DIN 2391 standard and is known for its excellent strength and dimensional precision. ST52 is a high-strength carbon steel grade containing carbon, silicon, manganese, phosphorus, and sulfur, which together provide outstanding toughness and durability.
With a minimum yield strength of 520 MPa and a minimum tensile strength of 600 MPa, DIN 2391 ST52 ERW pipes offer reliable performance under demanding conditions. They are widely used in the oil and gas industry, power generation, boilers, heat exchangers, and various mechanical engineering applications.
Specation Chart of DIN 2391 ST 52 Pipe
|
Standard
|
DIN 2391
|
|
Grade
|
ST52
|
|
Size
|
OD (4-190mm) x WT (0.5-15mm)
|
|
Outer Dimensions
|
4.0mm – 60.0mm
|
|
Wall Thickness
|
0.5mm – 8 mm
|
|
Length
|
max 6000mm
|
DIN 2391 ST 52 Welded Pipe Tolerance
|
OD Tolerance
|
4-30mm
|
31-40mm
|
41-50mm
|
51-60mm
|
61-70mm
|
71-80mm
|
81-90mm
|
91-100mm
|
|
±0.08mm
|
±0.15mm
|
±0.20mm
|
±0.25mm
|
±0.30mm
|
±0.30mm
|
±0.40mm
|
±0.45mm
|
|
WT Tolerance
|
±10%
|
DIN 2391 ST52 Welded Pipe Composition Chart
|
Standard
|
Grade
|
C
|
Si
|
Mn
|
P max
|
S max
|
|
DIN2391
|
St52
|
≤0.22
|
≤0.55
|
≤1.6
|
0.025
|
0.025
|
DIN 2391 ST 52 Rectangular Pipe Mechanical Behaviour
|
|
Cold drawn(Mandatory)
|
Cold drawn(Soft)
|
Cold Drawn and Stress Release
|
Anneal
|
Normalizing
|
|
BK1）
|
BKW1）
|
(BKS)
|
(GBK)1）
|
(NBK)1）
|
|
Grade
|
Tensile
|
Elongation
|
Tensile
|
Elongation
|
Tensile
|
Yield point
|
Elongation
|
Tensile
|
Elongation
|
Tensile
|
Yield point
|
Elongation
|
|
N/mm2
|
%
|
N/mm2
|
%
|
N/mm2
|
N/mm2
|
%
|
N/mm2
|
%
|
N/mm2
|
N/mm2
|
%
|
|
St52
|
640
|
4
|
580
|
7
|
580
|
420
|
10
|
490
|
22
|
490~630
|
355
|
22
|
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