1)GB/T8163 Seamless Pipe Sizes (O.D. x W.T):21.3 mm-914mm x 2m-60m 2)Standard:GB/T8163 3)GB/T8163 Seamless Pipe Steel Grade:20#,16MN,Q345B 4)Surface:oiled or black painted to prevent rust 5)Marking:as per customer’s requirement Inner packing:Caps on two ends of every pipe Outer packing: Hexagonal shape bundles wrapped with strong steel trip or according to customers’requests.
Diamensional Tolerances Of GB/T8163 Seamless Pipe
Types of steel tubes | Outer diameter | Wall thickness | ||
Cold-rolled tubes | Tube sizes(mm) | Tolerances(mm) | Tube sizes (mm) | Tolerances(mm) |
>30~50 | ±0.3 | ≤30 | ±10% | |
>50~219 | ±0.8% | |||
Hot-rolled tubes | >219 | ±1.0% | >20 | ±10% |
Mechanical Properties Of GB/T8163 Seamless Pipe
Standard codes | Models of steel tubes | Tensite strength(MPa) | Yield strength(MPa) | Elongation(%) |
GB/T8163 | 10 | 335~475 | ≥205 | ≥24 |
20 | 410~550 | ≥245 | ≥20 | |
Q345 | 490~665 | ≥325 | ≥21 |
Chemical Composition Of GB/T8163 Seamless Pipe
Standard codes | Models of steel tubes | Chemical compositions(%) | |||||||
C | Si | Mn | P | S | Cr | Ni | Cu | ||
GB/T8163 | 10 | 0.07~0.14 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | ≤0.15 | ≤0.25 | ≤0.25 |
20 | 0.17~0.24 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.25 | ≤0.25 | |
Q345 | 0.12~0.20 | 0.20~0.55 | 1.20~1.60 | ≤0.045 | ≤0.045 | / | / | / |