Customization: | Available |
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After-sales Service: | Free |
Warranty: | Free |
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Boasting 30 years of dedicated experience in precision seamless steel pipe production, our factory proudly supplies leading automotive and motorcycle brands across China. Our expertise in pipe manufacturing, coupled with stringent high-standard quality control, ensures that our precision steel pipes are the preferred choice in high-demand industries such as automotive, motorcycle, marine, and hydraulic pipelines. Known for their high smoothness, crack-free performance during cold bending/expansion, robust pressure resistance, and remarkable dimensional accuracy, our precision tubes set the standard in the industry.
Chemical composition
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Steel grade
|
% by mass
|
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Symbol
|
Material
number
|
C
max.
|
Si
max.
|
Mn
|
P
max.
|
S
max.
|
St 30Si | 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
|
Mechanical properties at room temperature
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Steel grade
|
Minimum values for the delivery condition
|
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BK
|
BKW
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BKS
|
GBK
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NBK
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Steel
name
|
Steel
number
|
Rm Mpa |
A % |
Rm Mpa |
A % |
Rm Mpa |
Reh Mpa |
A % |
Rm Mpa |
A % |
Rm Mpa |
Reh Mpa |
A % |
St 30Si | 1.0211 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 215 | 30 |
St 30 Al | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 215 | 30 |
St 35 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340 t0 480 | 235 | 25 |
St 45 | 1.0408 | 580 | 5 | 520 | 8 | 520 | 375 | 12 | 390 | 21 | 440 to 570 | 255 | 21 |
St 52 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
Size tolerance | |||||
OD | Standard tolerance | Special tolerance | |||
Outer Diameter | GB/T3639 | DIN2391 | EN10305 | O D | thickness |
4mm-20mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.05mm | ±0.05mm |
20mm-30mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm |
31mm-40mm | ±0.15 mm | ±0.15 mm | ±0.15 mm | ±0.10 mm | ±0.08 mm |
41mm-60mm | ±0.20 mm | ±0.20 mm | ±0.20 mm | ±0.15 mm | ±0.15 mm |
61mm-80mm | ±0.30 mm | ±0.30 mm | ±0.30 mm | ±0.20 mm | ±0.20 mm |
Equivalent Material referance: | ||||||
GB | TOCT | ASTM | BS | JIS | NF | DIN |
10F | 1010 | 040A10 | XC10 | |||
10 | 10 | 1010,1012 | 045M10 | S10C | XC10 | C10,CK10 |
20 | 20 | 1020 | 050A20 | S20C | XC18 | C22,CK22 |
35 | 35 | 1035 | 060A35 | XC35,C35 | C35,CK35 | |
45 | 45 | 1045 | 080M46 | S45C | XC45 | C45,CK45 |
30CrMo | 30XM | 4130 | 1717COS110 | SCM420 | 30CD4 | 25CrMo4 |
42CrMo | 4140 | 708A42 | 42CD4 | 42CrMo4 | ||
35CrMo | 35XM | 4135 | 708A37 | SCM3 | 35CD4 | 34CrMo4 |
25Mn | 25T | 1025,1026 | 080A25,080A27 | 26Mn5 |
Material | 10#-45#, 16Mn, A53-A369, Cr-Mo alloy, Q195-Q345, ST35-ST52, 10#, 20#, 45#, 16Mn, A213, A315, 30CrMo, Q195, Q215, Q235, Q345, ST35, St37, St45, St52 |
Surface | Black/ Bright |
Standard | DIN, GB, JIS, DIN 17175, DIN 2391, GB 5310, GB/T 13793, GB/T3639 , JIS G3441,EN 10305,ASTM A519 |
Size | OD 15mm-75mm |
Thickness 1-12mm | |
Processing | Cold rolled/ Cold drawn |
1. BK (+C) No heat treatment after last cold forming process. | |
2. BKW (+LC) After last heat treatment there is a light finishing pass ( cold drawing) | |
3. BKS (+SR) After the final cold forming process the tubes are stress relieve annealed. | |
4. GBK (+A) After the final cold forming process the tubes are annealed in a controlled atmosphere. | |
5. NBK (+N) After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere. | |
Packing | Woven bag/ Wooden or crate carton/ Bundle Packing/ Plain end or vanished as per customer's request. |
Delivery time | Normally 25-40 working days |