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DIN 2391 ST35 BK Thick Wall High - Precision Steel Tube , Round Cold Rolled Pipe
QuickDetail:
Description:
Standard:
ChinaStandardGB8162-2008,GB3639-2000
AmericanStandardASTMA106,ASTMA519,ASTMA513,ASTMA179
GermanyStandardDIN2391,DIN2445
JapaneseStandardJISG3445etc
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 | 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 | Material | 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 | ||||
Applications:
1. Automotive fields
A. Fuel injection lines/nozzles
B. CNG (Compressed Nature Gas) tube-- Burst pressure: 1307Bar, Working Pressure: around 350bar
C. Drive transmission: Steering column elements
D. Gear shafts, hand brake, front axles, airbag inflators, stabilizers, seat fasteners, front-wheel drive shafts
2. Hydraulic Fields
A. Hydraulic circuits (HPL), pneumatic lines, and hydraulic suspension system
B. Hydraulic cylinders (HPZ)
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