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DIN 2391-81 SEAMLESS PRECISION STEEL TUBES
(DIN2391-81) |
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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 |
① |
| ② |
| ③ |
| ④ |
|
St30Si |
S |
0.10Max |
0.30Max |
≤0.55 |
0.040Max |
0.040Max |
- |
- |
- |
- |
① |
| ② |
| ③ |
| ④ |
|
St30A1 |
S |
0.10Max |
0.05Max |
≤0.55 |
0.040Max |
0.040Max |
- |
- |
- |
Al deoxydized |
① |
| ② |
| ③ |
| ④ |
|
St35 |
S |
0.17Max |
0.35Max |
≥0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
① |
| ② |
| ③ |
| ④ |
|
St45 |
S |
0.21Max |
0.35Max |
≥0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
① |
| ② |
| ③ |
| ④ |
|
St52 |
S |
0.22Max |
0.55Max |
≥1.60 |
0.050Max |
0.050Max |
- |
- |
- |
- |
① |
| ② |
| ③ |
| ④ |
①Cold-finished/hard ②Cold-finished/soft ③Annealed ④Normalized
|
Grade
|
|
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 |
|
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