Customization: | Available |
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After-sales Service: | Free |
Warranty: | Free |
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With 30 years of dedicated expertise in crafting precision seamless steel pipes, our factory is a trusted supplier to leading automotive and motorcycle brands in China. We bring a wealth of experience to pipe manufacturing, backed by rigorous high-standard quality control. Our precision steel pipes are indispensable in high-demand sectors including automotive, motorcycle, shipbuilding, and hydraulic pipelines, renowned for their superior smoothness, resilience to cold bending/expansion without cracking, exceptional pressure resistance, and remarkable dimensional accuracy.
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 |