Cold Drawn Seamless Precision Steel Tube , DIN 2391 St35 St37, St45, St52 Bright Annealed Tube
Brief Introduction:
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
Out Dimensions: 6 mm ~ 350 mm
Wall Thickness: 0.8 mm ~30mm
Length: Fixed(6m,9m,12,24m) or normal length(5-12m)
Precision steel tube
Precision in size,Bright surface, high 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 0.35Ra 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 industry
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
max. |
Si
max. |
Mn |
P
max. |
S
max. |
| 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 |
Competitive Advantage:
Yaxin Precision Tube Co., Ltd.
Leading precision steel tube supplier in the global market, yield 70,000 tons per year based on both seamless tubing and welded tubing. 100% of tubing is used on automotive industry and hydraulic system.
