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Quick Details
Specifications
Galvanized DIN 2391 ISO 8535 Precision Steel Tube / Pipes for Automotive , Hydraulic
Quick Detail:
Standard: DIN 2391 EN10305-1, EN10305-4, BS 6323, ISO 8535
Grade: St 30 Si / St 30 Al / St
35 / St37 / St37.4 / St45 / St 52 / St52.4 / E215 / E235 /
E355
Size:(mm)
Out Dimensions: 6 mm ~ 350
mm
Wall Thickness: 0.8 mm ~30mm
Length: Fixed(6m,9m,12,24m) or normal
length(5-12m)
Description:
Precision steel
tube
Precision in size,Bright for the surface, high ability
of mechanical performance
Standard: DIN 2391, EN10305-1, EN10305-4, BS 6323, ISO 8535
STEEL GRADE: ST30Si, ST30Al, ST35, ST37, ST37.4, ST45, ST52, ST52.4, etc
SURFACE TREATMENTS
1. Bare Tube (No coating): Bright and smooth, Surface Roughness both inner and outer surface
0.2Ra Maximum for special requirement
2. Surface Coating
A. Silver galvanized
B. Yellow galvanized
C. Olive green coated
Layer thickness: 8-20um, Salty Spray Test: 48-150 hours
3. Black phosphate
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
B. Hydraulic cylinders (HPZ)
Chemical Composition:
Steel grade | Chemical composition, as a percentage by mass | |||||
Symbol | Material number | C | Si | Mn | P | S |
St 30 Si | 1.0211 | 0.10 | 0.30 | <=0.55 | 0.025 | 0.025 |
St 30 Al | 1.0212 | 0.10 | 0.05 | <=0.55 | 0.025 | 0.025 |
St 35 | 1.0308 | 0.17 | 0.35 | <=0.40 | 0.025 | 0.025 |
St 45 | 1.0408 | 0.21 | 0.35 | <=0.40 | 0.025 | 0.025 |
St 52 | 1.0580 | 0.22 | 0.55 | <=1.60 | 0.025 | 0.025 |
The following alloying elements may be added: Nb: <=0,03%; Ti: <=0,03%; V: <=0,05%; Nb + Ti + V: <=0,05%. | ||||||
Final supply conditions:
Designation | Symbol | Description |
Cold finished (hard) | BK | 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 | 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 | The last cold forming process is followed by annealing in a controlled atmosphere. |
Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Condition on delivery:
Steel Grade | BK | BKW | GBK | NBK | ||||
Code No. | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min |
St30 Si | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
St30 Al | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
St 35 | 440 | 6 | 370 | 10 | 315 | 25 | 340-470 | 25 |
St 45 | 540 | 5 | 470 | 8 | 390 | 21 | 440-570 | 21 |
St 52 | 590 | 4 | 540 | 7 | 490 | 22 | 490-630 | 22 |