Structural black carbon steel pipes are uncoated carbon steel tubes with tensile strength ranging from 400 to 550 MPa and yield strength above 235 MPa, offering excellent strength and weldability. They are widely used in building frameworks, bridges, and industrial structures for reliable load-bearing performance.
Product Parameters
|
Item |
Description |
|
Standard |
GB/T 8162, ASTM A53, ASTM A500, EN 10210, JIS G3444, or as per customer requirement |
|
Material Grades |
Q195, Q235, Q345, S235JR, S355JR, ASTM A36, or equivalent carbon steel |
|
Manufacturing Method |
Hot-rolled seamless, cold-drawn seamless, or electric resistance welded (ERW) |
|
Outer Diameter Range (OD) |
21.3 mm – 610 mm |
|
Wall Thickness Range (WT) |
1.5 mm – 20 mm |
|
Length |
6 m – 12 m (customized lengths available) |
|
Surface Condition |
Black steel finish with anti-rust oil protection |
|
Elongation |
≥ 20 % |
|
Welding Performance |
Excellent weldability and formability |
|
Dimensional Tolerance |
OD ±1 %, WT ±10 %, length ±50 mm |
|
End Finish |
Plain end, beveled end, or threaded end |
|
Testing Items |
Hydrostatic test, ultrasonic test, visual inspection, mechanical property test |
|
Surface Quality |
Smooth surface, free from cracks, dents, scale, or visible defects |
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