Standard of implementation: Chinese GB/T8163, GB/T8162, ASTM A106 GrB, ASTM A192
Application: used in conveying water, oil, gas and other fluids, and in structural building
Major grade grades: Grade10, 20 (negotiated, can also supply other special grade of steel tube. Accept the special requirements of the customer orders, such as the implementation of Q/320204AAAE02-2006 standard enterprise standard mechanical piping)
Chemical composition and mechanical properties of Seamless Steel Pipe:
Standard |
Steel grade |
Chemical constituents (%) |
||||||
C |
Mn |
Si |
Cr |
Ni |
Cu |
P.S |
||
GB/T8163 |
10 |
0.07~0.13 |
0.35~0.65 |
0.17~0.37 |
≤ 0.15 |
≤ 0.30 |
≤ 0.25 |
≤ 0.030 |
20 |
0.17~0.23 |
0.35~0.65 |
0.17~0.37 |
≤ 0.25 |
≤ 0.25 |
≤ 0.25 |
≤ 0.030 |
|
Q345 |
0.12~0.20 |
1.20~1.60 |
0.20~0.55 |
|
|
|
≤ 0.030 |
|
Mechanical properties |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation(%) |
|||||
10 |
335~475 |
≥ 205 |
≥ 24 |
|||||
20 |
410~550 |
≥ 245 |
≥ 20 |
|||||
Q345 |
490~665 |
≥ 325 |
≥ 21 |
Dimensional tolerance of Seamless Steel Pipe:
Type of steel tube |
Steel tube size mm |
Deviation |
||
Ordinary grade |
Senior |
|||
Hot rolling (extrusion, expansion) tube |
Outside diameterD |
All |
+1%(Minimum+0.50) |
- |
Wall thicknessS |
All |
+15%(Minimum+0.45) -12.5%(Minimum-0.40) |
- |
|
Cold drawing (rolling) tube |
Outside diameterD |
6~10 |
+0.20 |
+0.15 |
>10~30 |
+0.40 |
+0.20 |
||
>30~50 |
+0.45 |
+0.30 |
||
>50 |
+1% |
+0.8% |
||
Wall thicknessS |
≤1 |
+0.15 |
+0.12 |
|
>1~3 |
+15% -10% |
+12.5% -10% |
||
>3 |
+12.5% -10% |
+10% |
||
Note: the outer diameter is not less than 351mm of the thermal expansion tube, the wall thickness allows the deviation of +18% |
Seamless Steel Pipe
Hot Rolled Seamless Steel Pipe,Hot-Expanded Seamless Steel Tube,Cold-Drawn Seamless Steel Tube,Carbon Steel Seamless Pipe
Cangzhou Fixed Star Steel Co.,Ltd , http://www.fixedstarpipe.com