DIN 2394-81 As-Welded and Sized Precision Steel Tubes
Field of application
This Standard applies to welded and sized precision steel tubes; and, in compliance with ISO/DIS 3306, those tube dimensions have been selected from the range of manufacture dimensions which are mainly used as design elements
If tubes with the tolerances and in accordance with the technical conditions of delivery of this Standard ard to be user as pipelines, the dimensions of DIN 2458 may, if necessary, be used. These tubes must e ordered according to quality grade C.
Grade |
Mfg. Process |
Chemical composition (%) |
| C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
Others |
|
St28 USt28 RSt28 |
W |
0.13Max |
- |
- |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
| b |
| c |
|
St34.2 US34.2 RSt34.2 |
W |
0.15Max |
- |
- |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
| b |
| c |
|
St3.2 US37.2 RSt37.2 |
W |
0.17Max |
- |
- |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
| b |
| c |
|
St44.2 |
W |
0.21Max |
- |
- |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
| b |
| c |
|
St52.3 |
W |
0.25Max |
0.55Max |
1.60Max |
0.040Max |
0.040Max |
- |
- |
- |
- |
a |
| b |
| c |
a. Welded and Sized b.Annealed c.Normalized
Outside Diameter: 16, 18, 20, 22, 25, 30, 32, 35, 38, 40, 45, 60 mm
Wall Thickness: 1; 1,2; 1,5; 1,8; 2; 2,2; 2,5; 3; 3,5 mm
Notes:
- Steel Grades - RSt 34-2, RSt 37-2, St 44-2
- Length up to 9 м.
| Tubes Sizes |
Outside Diameter ( Nominal Size), mm |
Wall Thickness, mm |
16; 18 |
1,0; 1,2; 1,5 |
20; 22 |
1,0; 1,2; 1,5; 1,8; 2,0 |
25; 30; 32 |
1,0; 1,2; 1,5; 1,8; 2,0; 2,2; 2,5 |
35; 38 |
1,5; 1,8; 2,0; 2,2; 2,5 |
40; 45 |
1,5; 1,8; 2,0; 2,2; 2,5; 3,0 |
60 |
1,8; 2,0; 2,2; 2,5; 3,0; 3,5 |
| Mechanical properties |
Steel Grade |
|
|
Elongation, % (min) |
NBK |
RSt 34-2 |
310 - 410 |
205 |
28 |
RSt 37-2 |
340 - 470 |
235 |
25 |
St 44-2 |
410 - 540 |
255 |
21 |
|
BK |
RSt 34-2 |
330 |
- |
8 |
RSt 37-2 |
390 |
- |
7 |
St 44-2 |
440 |
- |
6 |
GBK |
RSt 34-2 |
300 |
- |
28 |
RSt 37-2 |
315 |
- |
25 |
St 44-2 |
390 |
- |
21 |
Grade |
Material number |
Tensile Test MPa or N/mm2 |
Remarks (Similar to JIS) |
| Min Yield point |
Tensile Strength |
St28
USt28
RSt28 |
-
1.0357
1.0326 |
- |
305Min |
(STKM11) (STAM290G) |
|
- |
265Min |
| 180 |
275~385 |
St34-2
US34-2
RSt34-2 |
-
1.0028
1.0034 |
- |
335Min |
- |
|
- |
305Min |
| 205 |
315~410 |
St37-2
US37-2
RSt37-2 |
1.0037
1.0036
1.0038 |
- |
390Min |
(STKM12) |
|
- |
315Min |
| 205 |
340~470 |
St44-2 |
1.0044 |
- |
440Min |
(STKM13) (STAM390G) |
| - |
390Min |
| 255 |
410~540 |
St52-3 |
1.0570 |
- |
540Min |
(STKM19) |
| - |
490Min |
| 350 |
490~630 |
Other relevant standards
DIN 2394 Part 2 Seamless precision steel tubes; technical conditions of delivery
Dimensions, designation
The tubes are generally ordered in terms of outside diameter and wall thickness. Should Should the inside diameter be more Important, then the tubes may also be ordered in terms of inside diameter and wall thickness or also in terms of outside and inside diameter. These tubes must be ordered according to quality grade C.
If the permissible deviations in diameter are to be one way only, this must be stated on ordering; in this case the total range of ± tolerance is the permissible one-way deviation,
e.g. instead of (55 ± 0.30) mm either
55mm (0, +0.5mm), 55mm (-0.5mm, 0)
The permissible deviations in diameter given in the table of dimensions apply to the welded and sized condition on delivery (BKM). In the case of annealed (GBK) and normalized (NBK) tubes, the tolerances on diameter are greater because of distortion during annealing, the permissible values being as follows:
wall thickness ≥ 1
outside diameter ≥ 20
the values quoted in the table of dimensions
wall thickness less than 1
outside diameter less than 20 to 40
1.5 times the values quoted in the table of dimensions
wall thickness less than 1
outside diameter less than 40
twice the values given in the table of dimensions
The permissible deviations in diameter include ovality.
The dimensional deviations specified for the wall thicknesses do not apply in the region of the weld.
For intermediate dimensions, which can be supplied by agreement, the deviations on the next larger nominal dimension apply.
Designation of a welded precision steel tube made of RSt 37-2, in the BKM condition on delivery, of outside diameter od = 40 mm and wall thickness s = 1.5 mm: Tube DIN 2394 - RSt 37-2 BKM 40 x 1.5
Technical conditions of delivery
Technical conditions of delivery according to DIN 2394 Part 2.
Wall thickness
s |
Nominal dimension |
0.7
|
1
|
1.2
|
1.5
|
1.8
|
2
|
2.2
|
2.5
|
3
|
3.5
|
4
|
4.5
|
5
|
5.5
|
6
|
6.5
|
7
|
| Permissible deviation |
± 10% the nominal dimension 1) The deviation of centers (eccentricity) is included in the permissible wall thickness deviation.
|
| Outside diameter od |
Mass per meter length in kg
|
Nominal
dimension
|
Permissible
deviation
|
| 4 |
±0.12
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 6 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 8 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 12 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 16 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 18 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 20 |
±0.15
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 22 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 25 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 32 |
±0.20
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 35 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 38 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 45 |
±0.30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 50 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 55 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 60 |
±0.40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 70 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 80 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 90 |
±0.50 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 100 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 108 |
±0.60 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 114 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 120 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 133 |
±1.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 159 |
±1.2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
S/D = 1/40 |
S/D = 1/20 |
1) For outside diameter nominal dimension 4 mm, permissible deviation from nominal dimension s of the wall thickness ± 20%
For outside diameter, nominal dimension 6 and 8 mm, permissible deviation from nominal dimension s of the wall thickness: ± 15% |
DIN 2391 Seamless Precision Steel Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube
EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
|
