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DIN 2391 ST52 Cold Drawn Seamless Steel Tube
DIN 2391 is a German industrial standard for the production and use of high-precision cold-drawn seamless steel tubes. ST52 is one of the high-strength low-alloy structural steel grades with excellent mechanical properties and machinability.
Manufacturing process
|
Process steps |
Description |
|
Hot rolling |
Make tube blanks |
|
Pickling |
Remove surface oxide scale |
|
Cold drawing/cold rolling |
Fine machining to achieve required dimensional accuracy and surface quality |
|
Heat treatment |
Anneal or normalize to improve organizational properties as required |
|
Finishing |
Straightening, cutting, surface treatment to ensure the quality of finished products |
Material chemical composition (%)
|
C |
Mn |
Si |
P |
S |
|
≤ 0.22% |
1.60% |
0.55% |
≤ 0.025% |
≤ 0.025% |
Mechanical properties
|
Tensile strength |
Yield strength |
Elongation |
Hardness |
|
490-630 MPa |
≥ 355 MPa |
≥ 14% |
≤ 180 |
Dimensions and tolerances
|
Outer diameter (mm) |
Wall thickness (mm) |
Outside diameter tolerance (mm) |
Wall thickness tolerance (mm) |
|
4-120 |
0.5-12.5 |
± 0.08-± 0.15 |
± 0.05-± 0.10 |
Purchase and precautions
When purchasing, pay attention to:
● Standard certification: Ensure compliance with DIN2391 standards.
● Specification parameters: Confirm the outer diameter, wall thickness and length according to actual needs.
● Surface state: Pipes without scratches and rust are preferred.
● Heat treatment state: Select the appropriate delivery state (such as annealing, normalizing) according to the usage scenario.
Seamless pipe，Cold drawn steel pipe，DIN 2391
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