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DIN 2391 seamless precision steel tubes

DIN2391 Seamless Precision Steel Tubes Scope:
DIN 2391 Part 2 delineates dimensions for cold-finished, seamless precision steel tubes, complemented by technical delivery conditions specified within the same standard. These dimensions and conditions are primarily applicable in mechanical and automotive engineering.
 
Steel tubes conforming to the dimensions stipulated in DIN 2391 Part 2 must adhere to the technical delivery conditions detailed in subclause 1.2 of the standard.
 
DIN 2391 seamless precision tubes are widely used in hydraulic and pneumatic cylinders, as well as in various applications within 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

DIN 2391 seamless precision steel tubes

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