DIN 2391-81 SEAMLESS PRECISION STEEL TUBES
DIN 2391-81 SEAMLESS PRECISION STEEL TUBES (DIN2391-81) 1.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.
Grade
Mfg. Process
Chemical composition
C
Si
Mn
P
S
Ni
Cr
Mo
Others
a
b
c
d
St30Si
S
0.10Max
0.30Max
÷0.55
0.040Max
0.040Max
-
-
-
-
a
b
c
d
St30A1
S
0.10Max
0.05Max
÷0.55
0.040Max
0.040Max
-
-
-
Al deoxydized
a
b
c
d
St35
S
0.17Max
0.35Max
∶0.40
0.050Max
0.050Max
-
-
-
-
a
b
c
d
St45
S
0.21Max
0.35Max
∶0.40
0.050Max
0.050Max
-
-
-
-
a
b
c
d
St52
S
0.22Max
0.55Max
∶1.60
0.050Max
0.050Max
-
-
-
-
a
b
c
da.Cold-finished/hard b.Cold-finished/soft c.Annealed d.Normalized
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
Welded Steel Tubing and pipe-Corresponding to DIN 2391-1
Wall thicknesss
Nominal dimension
0.5
0.8
1
1.2
1.5
1.8
2
2.2
2.5
2.8
3
4.5
5
5.5
6
7
8
9
10
12
14
16
18
20
22
25
Permissible deviation
Outside diameter da
Nominal dimension
Permissible deviation
4
+/-0.1
5
6
7
8
9
10
12
【0.08
14
15
16
18
20
22
25
26
28
30
32
【0.15
35
38
40
42
【0.20
45
48
50
55
【0.25
60
65
【0.30
70
75
【0.35
80
85
【0.40
90
95
【0.45
100
110
【0.50
120
130
【0.70
140
150
【0.80
160
170
【0.90
180
190
【1.0
200
220
【1.20
240
260
【1.30
1) For outside diameters of nominal dimensions 4 and 5 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【 20 % For outside diameters of nominal dimensions 6 to 8 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【15%.
s/D=1/60
s/D=1/40
s/D=1/20We are able to provide customers with quality products and perfect service.
If you want to know more information, please kind to visit our website.
www.sunnysteel.com
Tel.:+8621-3378 0199 Fax:+8621 5107 9722 MSN Online Consultation
DIN 2391-81 SEAMLESS PRECISION STEEL TUBES (DIN2391-81) 1.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.
Grade
Mfg. Process
Chemical composition
C
Si
Mn
P
S
Ni
Cr
Mo
Others
a
b
c
d
St30Si
S
0.10Max
0.30Max
÷0.55
0.040Max
0.040Max
-
-
-
-
a
b
c
d
St30A1
S
0.10Max
0.05Max
÷0.55
0.040Max
0.040Max
-
-
-
Al deoxydized
a
b
c
d
St35
S
0.17Max
0.35Max
∶0.40
0.050Max
0.050Max
-
-
-
-
a
b
c
d
St45
S
0.21Max
0.35Max
∶0.40
0.050Max
0.050Max
-
-
-
-
a
b
c
d
St52
S
0.22Max
0.55Max
∶1.60
0.050Max
0.050Max
-
-
-
-
a
b
c
da.Cold-finished/hard b.Cold-finished/soft c.Annealed d.Normalized
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
Welded Steel Tubing and pipe-Corresponding to DIN 2391-1
Wall thicknesss
Nominal dimension
0.5
0.8
1
1.2
1.5
1.8
2
2.2
2.5
2.8
3
4.5
5
5.5
6
7
8
9
10
12
14
16
18
20
22
25
Permissible deviation
Outside diameter da
Nominal dimension
Permissible deviation
4
+/-0.1
5
6
7
8
9
10
12
【0.08
14
15
16
18
20
22
25
26
28
30
32
【0.15
35
38
40
42
【0.20
45
48
50
55
【0.25
60
65
【0.30
70
75
【0.35
80
85
【0.40
90
95
【0.45
100
110
【0.50
120
130
【0.70
140
150
【0.80
160
170
【0.90
180
190
【1.0
200
220
【1.20
240
260
【1.30
1) For outside diameters of nominal dimensions 4 and 5 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【 20 % For outside diameters of nominal dimensions 6 to 8 mm, the permissible deviation from the nominal dimension s of the wall thickness is 【15%.
s/D=1/60
s/D=1/40
s/D=1/20We are able to provide customers with quality products and perfect service.
If you want to know more information, please kind to visit our website.
www.sunnysteel.com
Tel.:+8621-3378 0199 Fax:+8621 5107 9722 MSN Online Consultation