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DIN 2393-81 Part 2 WELDED PRECISION STEEL TUBES
(DIN2393-81) |
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1.Field of application
This Standard defines the technical conditions of delivery for welded precision steel tubes in accordance with DIN 2393 Part 1 which are made from the steel grades listed in section 5.
Tubes in accordance with this Standard are mainly used where accuracy to dimension and in some cases also small wall thicknesses and good surface condition are required.
|
Grade |
Mfg. Process |
Chemical composition(%) |
|
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
Others |
|
St28
USt28
RSt28 |
W |
0.13Max |
- |
- |
0.50Max |
0.50Max |
- |
- |
- |
- |
① |
|
② |
|
③ |
|
④ |
|
St34.2
US34.2
RSt34.2 |
W |
0.15Max |
- |
- |
0.50Max |
0.50Max |
- |
- |
- |
- |
① |
|
② |
|
③ |
|
④ |
|
St37.2
USt37.2
RSt37.2 |
W |
0.17Max |
- |
- |
0.50Max |
0.50Max |
- |
- |
- |
- |
① |
|
② |
|
③ |
|
④ |
|
St44.2 |
W |
0.21Max |
- |
- |
0.50Max |
0.50Max |
- |
- |
- |
- |
① |
|
② |
|
③ |
|
④ |
|
St52.3 |
W |
0.22Max |
0.55Max |
1.60Min |
0.040Max |
0.040Max |
- |
- |
- |
- |
① |
|
② |
|
③ |
|
④ |
①Cold-finished/hard ②Cold-finished/soft ③Annealed ④Normalized
|
Grade
|
Materia
number |
Tensile Test MPa or N/mm2 |
Remaks (Similar to JIS) |
Possibility Temperature |
|
Min Yield point |
Tensile Strength |
|
St28
USt28
RSt28 |
-
1.0357
1.0326 |
- |
400Min |
(STKM11)
(STAM80G) |
|
|
- |
325Min |
|
- |
265Min |
|
175 |
275~380 |
|
St34-2
US34-2
RSt34-2 |
-
1.0028
1.0034 |
- |
410Min |
- |
|
|
- |
350Min |
|
- |
305Min |
|
205 |
315~410 |
|
St37-2
USt37-2
RSt37-2 |
1.0037
1.0036
1.0038 |
- |
440Min |
(STKM12) |
|
|
- |
370Min |
|
- |
315Min |
|
235 |
340~470 |
|
St44-2 |
1.0044 |
- |
570Min |
(STKM13)
(STAM40G) |
|
|
- |
450Min |
|
- |
390Min |
|
255 |
410~540 |
|
St52-3 |
1.0570 |
- |
590Min |
(STKM19) |
|
|
- |
540Min |
|
- |
490Min |
|
350 |
490~630 |
Table 1. Steel grades
|
Quality grade |
Steel grade |
|
Code number |
Material number |
|
A and B |
St 28
USt 28
RSt 28
St 34-2
USt 34-2
RSt 34-2
St 37-2
USt 37-2
RSt 37-2
St 44-3
St 52-3 |
-
1.0357
1.0326
-
1.0028
1.0034
1.0037
1.0036
1.0038
1.0044
1.0570 |
|
C |
All steel grades IN accordance with quality grade A and B or other weldable steels, example to |
|
DIN 1614
DIN 1623
DIN 1624 |
DIN 1651
DIN 17200
DIN 17 210 |
6. Chemical composition
6.1. Information on the chemical composition of the steels is given in table 2. Small departures from these data which apply to the ladle analysis are permissible provided the properties of the steel in use are not thereby impaired.
6.2. When subsequent testing is carried out on the finished tube, additions to the figures given for the ladle analysis in table 2 must be allowed for the maximum permissible contents in terms of carbon, phosphorus and sulfur :
|
- |
ifor deviations due to sampling and method of analysis |
+ 5 % |
|
- |
ifor deviations due to segregation |
|
|
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in the case of rimming steels |
+ 20% |
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in the case of killed stees |
+ 5 % |
of the particular maximum content. | 
