Seamless fluid tubes are carbon steel pipes made to the GB/T 8163 standard, with tensile strength ranging from 410 to 550 MPa and yield strength above 245 MPa. They have smooth inner walls and strong pressure resistance, making them widely used for conveying water, oil, gas, and steam in industrial applications.
Product Parameters
|
Item |
Description |
|
Standard |
GB/T 8163 – Seamless steel pipes for fluid transportation |
|
Material Grades |
10#, 20#, Q345, or equivalent carbon steel grades |
|
Manufacturing Process |
Hot-rolled or cold-drawn seamless process |
|
Outer Diameter Range (OD) |
10 mm – 630 mm |
|
Wall Thickness Range (WT) |
1.5 mm – 60 mm |
|
Length |
4 m – 12 m (customized lengths available) |
|
Surface Condition |
Black, oiled, galvanized, or phosphate-coated finish |
|
Tensile Strength |
410 – 550 MPa (for Grade 20) |
|
Yield Strength |
≥ 245 MPa |
|
Elongation |
≥ 20 % |
|
Working Pressure |
Up to 10 MPa depending on pipe size and wall thickness |
|
Operating Temperature |
−40 °C to +400 °C |
Allowable Deviation Levels for Standardized Outer Diameter of Carbon Steel Pipe
|
Level of deviation |
Allowable deviation of standardized outer diameter |
|
D1 |
±1.5%.The minimum±0.75 mm |
|
D2 |
±1.0%.The minimum±0.50 mm |
|
D3 |
±0.75%.The minimum±0.30 mm |
|
D4 |
±0.50%.The minimum±0.10 mm |
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