Wenzhou Zhongyuan Steel Industrial Co.,Ltd
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Gold Index: 7905
Place of Origin: | Zhejiang, China (Mainland) |
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DIN 2391 ST35 BK Thick Wall High - Precision Steel Tube , Round Cold Rolled Pipe
Quick Detail:
Description:
Standard:
China Standard GB8162-2008, GB3639-2000
American Standard ASTM A106, ASTM A519, ASTM A513,ASTM A179
Germany Standard DIN2391, DIN2445
Japanese Standard JIS G3445 etc
European Standard EN10305
Specification
Designation |
Symbol |
Description |
Cold finished (hard) |
BK(+C) |
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation |
Cold finished (Soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding) |
Cold finished and stress-relieved |
BKS(+SR) |
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
Annealed |
GBK(+A) |
The last Cold forming process is followed by annealing in a controlled atmosphere. |
Normalized |
NBK(+N) |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
DIN 2391 Precision seamless steel tube
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 |
|||
St30Si |
S |
0.10Max |
0.30Max |
≤0.55 |
0.040Max |
0.040Max |
- |
- |
- |
- |
|
St30A1 |
S |
0.10Max |
0.05Max |
≤0.55 |
0.040Max |
0.040Max |
- |
- |
- |
Al deoxydized |
|
St35 |
S |
0.17Max |
0.35Max |
≥0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
|
St45 |
S |
0.21Max |
0.35Max |
≥0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
|
St52 |
S |
0.22Max |
0.55Max |
≥1.60 |
0.050Max |
0.050Max |
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