45# Precision steel tubes are seamless carbon steel pipes made from 45# grade steel, delivering tensile strength between 600 and 800 MPa with a yield strength above 355 MPa. They provide outstanding dimensional accuracy, surface finish, and machinability, making them widely used in hydraulic cylinders, automotive components, and precision mechanical parts.
Product Parameters
|
Standard |
GB/T 3639, DIN 2391, EN 10305, or as per customer requirements |
|
Material Grade |
45# carbon structural steel (equivalent to ASTM 1045, C45, S45C) |
|
Manufacturing Process |
Cold drawn and bright annealed precision seamless pipe |
|
Outer Diameter Range (OD) |
10 mm – 168 mm |
|
Wall Thickness Range (WT) |
1.5 mm – 20 mm |
|
Length |
3 m – 12 m (customized lengths available) |
|
Surface Condition |
Bright, smooth, free from oxidation or scaling |
|
Elongation |
≥ 10 % |
|
Precision Tolerance |
OD ±0.05 mm to ±0.10 mm; WT ±0.05 mm |
|
Straightness |
≤ 0.3 mm/m |
|
Surface Roughness |
Ra ≤ 0.8 μm |
Chemical Composition
|
Steel grade |
Chemical composition, as a percentage by mass |
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|
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%. |
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