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DIN2391 seamless precision steel tubes
DIN 2391 sets the stage for excellence with its range of seamless precision steel tubes tailored for applications in Mechanical and Automobile engineering. The steel grades that take the spotlight include ST35, ST45, and ST52, forming the backbone of this precision-oriented standard.
Under the nomenclature of DIN 2391, the ST35, ST45, and ST52 Precision tubes, also known as Seamless cold drawn tubes, weave a narrative of precision and reliability. These tubes, ranging from 6mm to 350mm in size with a wall thickness from 0.8mm to 50mm, exhibit a round shape and are produced through cold drawing or cold rolling techniques.
We proudly supplies the full spectrum of DIN 2391 seamless precision steel tubes, with a detailed Dimensional Table available for reference. The tubes are marked with essential information, including the manufacturers name, specified dimensions, European Standard number, steel name or number, cast number, and delivery condition. Specific inspection details are also included when applicable.
Mill test certificates, issued in accordance with EN10204 3.1, accompany these tubes, ensuring adherence to stringent quality standards. The manufacturing process complies with the Seamless cold drawn or cold-rolled requirements, and certified manufacturers hold the TS16949 certificate.
In terms of protection and packaging, the tubes are expertly packed in wooden boxes or bundles shielded with plastic paper, ready for sea-worthy delivery or as per customer specifications. Temporary corrosion protection is applied, with the method chosen at the manufacturers discretion.
As for applications, DIN 2391 seamless precision steel tubes find their purpose in automotive and machinery sectors, serving as Oil cylinder tubes, Motorcycle shock reducer steel tubes, and Auto shock reducer inner cylinders. In each application, these tubes play a pivotal role in ensuring precision, durability, and optimal performance.
DIN2391 Seamless Tubes Grade and Chemical Composition (%)
|
Grade |
Chemical Composition (%): |
||||
|
C max |
Si max |
Mn |
P max |
S max |
|
|
St 35 |
0.17 |
0.35 |
≥0.40 |
0.025 |
0.025 |
|
St 45 |
0.21 |
0.35 |
≥0.40 |
0.025 |
0.025 |
|
St 52 |
0.22 |
0.55 |
≤1.60 |
0.025 |
0.025 |
|
Steel grade |
Chemical Composition (%): |
||||||
|
Steel name |
Steel number |
C max |
Si max |
Mn |
P max |
S max |
Al min |
|
E215 |
1.0212 |
0.1 |
0.05 |
0.7 |
0.025 |
0.025 |
0.025 |
|
E235 |
1.0308 |
0.17 |
0.35 |
1.2 |
0.025 |
0.025 |
- |
|
E355 |
1.058 |
0.22 |
0.55 |
1.6 |
0.025 |
0.025 |
- |
DIN2391 Seamless Tubes Mechanical Properties (Mpa)
|
Steel Grade |
Minimum values for the delivery condition |
||||||||||||
|
Steel Name |
Steel Number |
BK |
BKW |
BKS |
GBK |
NBK |
|||||||
|
Rm |
A % |
Rm |
A % |
Rm |
ReH |
A % |
Rm |
A % |
Rm |
ReH |
A % |
||
|
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
|||||||
|
St 30 Si |
1.0211 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
|
St 30 Al |
1.0212 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
|
St 35 |
1.0308 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
340 to 470 |
235 |
25 |
|
St 45 |
1.0408 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440 to 570 |
255 |
21 |
|
St 52 |
1.058 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490 to 630 |
355 |
22 |
DIN2391 Seamless Tubes Inspection and test list for the DIN 2391 Standard.
|
Inspection or test types |
Test frequency |
|
|
Internal test |
Acceptance test |
|
|
Chemical analysis |
M |
M |
|
Tensile testing |
M |
One per tested batch |
|
Flattening test or extension test |
M |
Two per tested batch |
|
Dimension verification |
M |
M |
|
Visual inspection |
M |
M |
|
NDT in order to identify leaks |
Individual |
Individual |
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