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DIN 1629

DIN1629 is the standard of the seamless circular pipes non-alloy steels with special quality requirements. The main steel grades contain DIN1629 ST37.0, DIN1629 ST44.0 and DIN1629 ST52.0.

DIN1629 Seamless Steel Pipe
DIN1629-seamless steel pipe

Outer dimensions: 6.00mm-219.0mm
Wall thickness: 1.0mm-30.0mm
Length: max 12000mm

Applications: DIN1629 requires seamless steel pipe is used for manufacturing pipeline, vessel, equipment and pipe fittings.
Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements.
Painting: Just as customers’ required!

Chemical Composition(%):

Standard Grade C Si Mn P S Cr Ni Cu
DIN1629 St37.0 ≤0.17 0.17-0.37 0.35-0.65 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25
St44.0 ≤0.21 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25
St55 0.33-0.41 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25
St52.0 ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25

Mechanical Properties:

Grade Tensile strength Yield strength (Mpa)
not less than
Elongation (%)
not less than
≤16mm >16mm
St37.0 350-480 235 225 25
St44.0 420-550 275 265 21
St55 540-645 295 285 17
St52.0 500-650 355 345 21

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