English | português | русский| Español

Our company

hebeihaihao

Hebei haihao high pressure flange & pipe fitting group was established in 1982, located in Mengcun County the hometown of pipe fittings in China.


Read More About Haihao Group

ASTM A671 CC70 Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures


ASTM A671 CC70 Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures

ASTM A671 CC70 Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures


ASTM A671 CC70 Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures

EFW (Electric Fusion Welding) Steel Pipe refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld.

EFW steel pipe is formed by rolling plate and welding the seam. The weld flash can be removed from the outside or inside surfaces using a scarfing blade. The weld zone can also be heat treated to make the seam less visible. Welded pipe often has tighter dimensional tolerances than seamless, and can be cheaper if manufactured in the same quantities.

It is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys. Deep penetration welding fast, heat-affected zone is extremely small, so small performance impact on the joints, the joint almost no distortion. But it has a requirement on a special welding room because welding using X-rays.

Manufacturing machine for efw steel pipe: A combination of specially designed equipments like 1600MT press brake machine, multiple rolls bending machine, welding installations for outside, inside and circumferential welding, size calibrating press, solution annealing furnace and a host of other related machinery, is employed to manufacture pipes used in critical applications like refineries, fertilizers, LNG terminals, cross country pipe lines etc.

 

Type ASTM A671 Gr. CC60/ CC65/ CC70 LSAW / SAW / EFW PIPE
Executive Standard API SPEC 5L,GB/T 9711.1,GB/T 9711.2,GB/T 9711.3,SY/T5037
ASTM A671 Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
ASTM A672 Standard Specification for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
Size Outer Diameter Seamless  17-914mm    3/8-36 inch LSAW      457-1422mm  18-56 inch
  Wall Thickness 2-60mm SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS
  Length Single random length/Double random length 5m-14m,5.8m,6m,10m-12m,12m or as customer’s actual request
Ends Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc
Surface Treatment Bare,Painting black,varnished,galvanized,anti-corrosion PE PP/EP/FBE coating
Technical Methods Hot-rolled/Cold-drawn/Hot-expanded
Testing Methods Eddy current testing, Hydrostatic testing or Ultrasonic examination, NDT and also with chemical and physical property inspection
Packaging Small pipes in bundles with strong steel strips,large pieces in loose; Covered with plastic woven bags; Suitable for lifting operation; Loaded in 40ft or 20ft container or in bulk Also according to customer’s requests
Application Conveying oil, gas and water
MOQ 1 ton
Production Capacity 5000 T/M
Delivery Time Within 2 Weeks

 

Specification Steel grade Chemical composition Remarks
    C Si Mn P S Ti  
Pipes for pressure service ASTM A671, A672 -/A45 -/0.17 0.98 0.035 0.035 A671/A672
-/A50 -/0.22
CA55/A55 0.28
-/B55 -/0.20 0.13
CB60/B60 0.24 ~0.45
CB65/B65 0.28  
CB70/C70 0.31   1.3
-/C55 -/0.18   0.55
CC60/C60 0.21   ~0.98
CC65/C65 0.24   0.79
CC70/C70 0.27   ~1.30

 

Products Steel Grade BASE METAL MECHANICAL COMPOSITION Welding point tensile strength (N/mm2)
Yield point (N/mm2) Tensile Stregth (N/mm2) Test Pieces Elongation (%)
Pipes for pressure service ASTM A671, A672 -/A45 -/165 -/310~450 -/30 -/310~450
-/A50 -/185 -/345~485   -/28 -/345~485
CA55/A55 205 380~515   27 380~515
-/B55 -/205 -/380~515   -/27 -/380~515
CB60/B60 220 415~550   25 415~550
CB65/B65 240 450~585   23 450~585
CB70/B70 260 485~620   21 485~620
-/C55 -/205 -/380~515   -/27 -/380~515
CC60/C60 220 415~550   25 415~550
CC65/C65 240 450~585   23 450~585
CC70/C70 260 485~620   21 485~620

<< Back to Steel pipes


Haihao Group Twitter haihao group youtube haihao group facebook haihao group linkedin