Standard

DIN 2391

DIN 2391-- cold Drawn or cold rolled steel tube is used in hydraulic & pneumatic cylinder, mechanical and Automotive engineer


Size: 6mm-350mm.

W.T.: 0.8mm-50mm.

Shape: Round.

Production type: Cold drawn or cold rolled.

Length: Single random length/ Double random length or as customer’s actual request max length is 10m.

Grade: St30 Si, St30 Al, St35, St45, St52.


OD(mm) 

Wall Thickness Unit(mm)

2

2.5

3

3.5

4

4.5

5

6

6.5-7

7.5-8

8.5-9

9.5-10

11

12

Φ25-Φ28









Φ32









Φ34-Φ36









Φ38









Φ40










Φ42










Φ45









Φ48-Φ60








Φ63.5








Φ68-Φ73









Φ76





Φ80





Φ83





Φ89





Φ95





Φ102





Φ108





Φ114






Φ121






Φ127






Φ133






Φ140







Φ146







Φ152







Φ159







Φ168








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

1.0580

640

4

580

7

580

420

10

490

22

490 to 630

355

22


Inspection and Test List

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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