Limestone Quarry Plant

One of the Top 500 enterprises in China foreign trade

QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association

 
 

Seamless Pipe for Fluid Transport

Seamless Steel Pipe for Fluid Transportation

● National Standard: GB/T8163-2008

● Usage: used to transport fluids such as water, oil, and gas

 Seamless Pipe for Fluid Transport
● Main grade steel grades: 10 #, 20 #, Q345 (after consultation, other special grades of steel pipe can also be supplied. For example, Q295, Q390, Q420, Q460 quality grade is A, B, C, D)  

● Chemical composition, machinery performance:

 

standard
Steel grade chemical composition(%)
C Mn Si Cr Ni Cu PS
GB/T8163 10# 0.07 to 0.13 0.35 to 0.65 0.17 to 0.37 ≤ 0.15 ≤ 0.30 ≤ 0.25 ≤ 0.030
20# 0.17 to 0.23 0.35 to 0.65 0.17 to 0.37 ≤ 0.25 ≤ 0.25 ≤ 0.25 ≤ 0.030
Q345 0.12 to 0.20 1.20 to 1.60 0.20 to 0.55       ≤ 0.030
Mechanical behavior Tensile strength (MPa) Yield strength (MPa) Elongation(%)
10 335-475 ≥ 205 ≥ 24
20 410 to 550 ≥ 245 ≥ 20
Q345 490~665 ≥ 325 ≥ 21
 
 
● Dimensional tolerance:

Steel pipe type
Steel tube size  
mm
Allowable deviation
Ordinary level advanced
Hot-rolled (extruded, expanded) tube Outer diameter D All ±1%D (minimum ±0.50) -
Wall thickness S All +15%S (minimum +0.45)  
-12.5%S (minimum -0.40)
-
Cold drawn (rolled) tube Outer diameter D 6~10 ±1%D or ±0.20 ±0.15
>10~30 ±0.30 ±0.20
>30~50 ±0.45 ±0.30
>50 ±1% ±0.8%
Wall thickness S ≤1 ±0.15 ±0.12
>1~3 +15% 
-10%
+12.5% 
-10%
>3 +12.5% 
-10%
±10%
*Note: The wall thickness tolerance is + 18%S for thermal expansion tubes with an outside diameter of not less than 351mm.
 


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