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DIN 2391 seamless precision steel tubes
DIN2391 Seamless Precision Steel Tubes Scope:
DIN2391 Part 2 delineates dimensions for cold-finished, seamless precision steel tubes, complemented by DIN2391 Part 2, which outlines relevant technical delivery conditions. The specified sizes in the standard find primary application in mechanical and automotive engineering.
Steel tubes conforming to the dimensions stipulated in this standard must adhere to the technical delivery conditions detailed in subclause 1.2 of DIN 2391 Part 2.
DIN 2391 seamless precision tubes are utilized in hydraulic and pneumatic cylinders, as well as in mechanical and automotive engineering.
Chemical Composition (%) of DIN 2391 seamless precision steel tubes:
|
Standard |
Grade |
Chemical Components (%) |
|||||
|
Symbol |
Material No. |
C |
Si |
Mn |
P |
S |
|
|
DIN2391 |
St 30 Si |
1.0211 |
≤0.10 |
≤0.10 |
≤0.55 |
≤0.025 |
≤0.025 |
|
St 30 Al |
1.0212 |
≤0.10 |
≤0.05 |
≤0.55 |
≤0.025 |
≤0.025 |
|
|
St 35 |
1.0308 |
≤0.17 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
|
St 5 |
1.0408 |
≤0.21 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
|
St 52 |
1.058 |
≤0.22 |
≤0.55 |
≤1.60 |
≤0.025 |
≤0.025 |
|
DIN 2391 Seamless Precision Steel Tubes Delivery Conditions:
The tubes are manufactured through cold-drawn or cold-rolled processes and are supplied in various delivery conditions:
|
Designation |
Symbol |
Description |
|
Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and thus, have a rather high resistance to deformation. |
|
Cold finished (soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
|
Cold finished and stress-relieved |
BKS |
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
|
Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere. |
|
Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Delivery Condition Symbol in accordance with EN10305 and DIN2391
|
Symbol in accordance with EN 10305 |
Symbol in accordance with DIN2391 |
|
+C |
BK |
|
+LC |
BKW |
|
+SR |
BKS |
|
+A |
GBK |
|
+N |
NBK |
DIN 2391 Seamless Precision Steel Tubes Mechanical Properties:
Minimum values for the delivery condition:
|
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 |
Inspection and Test List for DIN 2391 Standard:
|
Inspection or test types |
Test frequency |
|
Internal test |
|
|
Chemical analysis |
M |
|
Tensile testing |
M |
|
Flattening test or extension test |
M |
|
Dimension verification |
M |
|
Visual inspection |
M |
|
NDT in order to identify leaks |
Individual |
DIN 2391 Seamless Precision Steel Tubes Marking:
A label attached to the bundle shall display the following information:
- Manufacturers name or trademark
- Specified dimensions
- Number of this European Standard
- Steel name or number
- Cast number
- Delivery condition
- In cases of specific inspection, an identification number (e.g., order or item number) correlating to the related document.
DIN 2391 Seamless Precision Steel Tubes Protection and Packing:
The tubes are packed in wooden boxes or bundles protected with plastic paper, suitable for sea-worthy delivery or as requested. Temporary corrosion protection is applied, at the manufacturers discretion.
DIN 2391 Seamless Precision Steel Tubes Note:
Mill test certificates will be issued according to EN10204.3.1 The tubes shall be seamless, cold-drawn, or cold-rolled. The manufacturer should have a TS16949 certificate.
DIN 2391 seamless precision steel tubes
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