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DIN 2391-81 Material Comparison Tables

DIN 2391-81 applies to seamless precision steel tubes; and, in compliance with ISO/DIS 3304, those tube dimensions have een selectied from the range of manufactura le tu e dimensions which are mainly used as design elements.
Field of application:
This Standard applies to seamless precision steel tubes; and, in compliance with ISO/DIS 3304, those tube dimensions have een selectied from the range of manufactura le tu e dimensions which are mainly used as design elements.
If tubes having the tolerances and are produced according to the technical conditions of deivery as specified in this Standard are to e used as pipelines, then the dimensions specified in DIN 2448 may from time to time be used. These tubes must be ordered according to quality grade C.
Material Comparison Tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI)
DIN 2391-81 Part 2 Seamless Precision steel tubes
DIN 2391-81 Part 2 Seamless Precision steel tubes
JIS Number and Corrensponding Foreign Standards (DIN2391)
Chemical composition (%)
Grade

Mfg. Process

Chemical composition (%)
C
Si
Mn
P
S
Ni
Cr
Mo
Others
 ①
②
③
④
St30Si
S
0.10Max
0.30Max
0.55Max
0.040Max
0.040Max
-
-
-
-
 ①
②
③
④
St30A1
S
0.10Max
0.05Max
0.55Max
0.040Max
0.040Max
-
-
-
Al deoxydized
 ①
②
③
④
St35
S
0.17Max
0.35Max
0.40Max
0.050Max
0.050Max
-
-
-
-
 ①
②
③
④
St45
S
0.21Max
0.35Max
0.40Max
0.050Max
0.050Max
-
-
-
-
 ①
②
③
④
St52
S
0.22Max
0.55Max
1.60Max
0.050Max
0.050Max
-
-
-
-
 ①
②
③
④

 

①Cold-finished/hard ②Cold-finished/soft ③Annealed ④Normalized

Mechanical Properties(Mpa)
Grade

 

Material
number
Tensile Test MPa or N/mm2

Remaks

(Similar to JIS)
Possibility Temperature

Min Yield point

Tensile Strength
St30Si
1.0211
-
400Min
(STKM11)
-
355Min
-
285Min
215
295~420
St30Al
1.0212
-
400Min
(STKM11)
-
355Min
-
285Min
215
295~420
St35
1.0308
-
440Min
(STC38)
-
370Min
-
315Min
235
340~470
St45
1.0408
-
540Min
(STKM13)
-
470Min
-
390Min
255
440~570
St52
1.0580
-
590Min
(STKM19)
-
540Min
-
490Min
350
490~630

 

JIS Number and Corrensponding Foreign Standards

Tube
o. d.
mm

Wall-
thick
ness
mm

Tube
i. d.
mm

Deign
pressure's
bar

Weight

kg/m

4
4
4

0.5
 0.75
1

3
2.5
2

313
409
522

0.043
0.063
 0.074

5
5

0.75
1

3.5
3

376
432

0.083
 0.099

6
6
6
6
6

0.75
1
1.5
2
2.25

4.5
4
3
2
1.5

333
389
549
692
757

0.103
0.123
0.166
0.197
 0.208

8
8
8
8
8

1
1.5
2
2
2.5

6
5
4
4
3

333
431
549
549
658

0.173
0.240
0.296
0.296
 0.339

10
10
10
10
10

1
1.5
2
2.5
3

8
7
6
5
4

282
373
478
576
666

0.222
0.341
0.395
0.462
 0.518

12
12
12
12
12
12

1
1.5
2
2.5
3
3.5

10
9
8
7
6
5

235
353
409
495
576
69

0.271
0.383
0.493
0.586
0.665
0.734

14
14
14
14
14
14
14

1
1.5
2
2.5
3
3.5
4

12
11
10
9
8
7
6

20
302
403
434
507
576
64

0.321
0.462
0.592
0.709
0.814
0.906
0.986

15
15
15
15
15

1
1.5
2
2.5
3

13
12
11
10
9

188
282
376
409
478

0.345
0.499
0.641
0.771
 0.888

16
16
16
16
16

1
1.5
2
2.5
3

14
13
12
11
10

176
264
353
386
452

0.370
0.536
0.691
0.832
 0.962

18
18
18
18
18

1
1.5
2
2.5
3

16
15
14
13
12

157
236
313
392
409

0.419
0.610
0.789
0.956
1.110

Tube
o. d.
mm

Wall-
thick
ness
mm

Tube
i. d.
mm

Deign
pressure's
bar

Weight

kg/m

20
20
20
20
20
20 

1.58
2
2.5
3
3.5
4

17
16
15
14
13
12

212
282
353
373
426
478

0.684
0.888
1.079
1.258
1.424
1.578

22
22
22
22
22

1
1.5
2
2.5
3

20
19
18
17
16

128
192
256
320
385

0.518
0.758
0.986
1.202
1.406

25
25
25
25
25
25

2
2.5
3
4
4.5
5

21
20
19
17
16
15

226
282
338
394
432
478

1.134
1.387
1.628
2.072
 2.275
2.466

28
28
28
28
28
28

1.5
2
2.5
3
4
5

25
24
23
22
21
18

151
201
252
302
403
434

0.980
1.282
1.572
1.850
2.368
2.836

30
30
30
30
30

2
2.5
3
4
5

26
25
24
22
20

188
235
282
376
409

1.381
1.695
1.998
2.565
3.083

35
35
35
35
35
35

2
2.5
3
4
5
6

31
30
29
27
25
23

161
201
242
322
403
419

1.628
2.004
2.367
3.058
3.699
4.291

38
38
38
38
38
38

2.5
3
4
5
6
7

33
32
30
28
26
24

186
223
297
371
390
446

2.189
2.589
3.354
4.069
4.735
5.352

42
42
42

2
3
4

38
36
34

134
201
269

1.973
2.885
3.749

50
50

6
9

38
32

338
437

6.511
9.103

65

8

49

347

11.246

80 

10

60

353

17.263

JIS Number and Corrensponding Foreign Standards
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