Large Diameter Carbon Welded Spiral Steel Pipe

Short Description:

Spiral welded pipe: It is made of low-carbon carbon structural steel or low-alloy structural steel strip rolled into a pipe billet at a certain angle of the spiral line (called forming angle), and then the pipe seam is welded together, which can produce large diameter steel pipe from narrower strip steel. Its specification is expressed by the outer diameter * wall thickness, welded pipe should ensure that the hydraulic test, tensile strength of the weld and cold bending properties to meet the provisions.

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Metallurgical properties of the material

Longitudinal submerged arc welded pipes are produced from steel plates, while spiral welded pipes are produced from hot-rolled coils. The hot-rolled strip unit rolling process has a number of advantages and has the metallurgical process capability to obtain the production of high quality pipe line steel. For example, the output stand is equipped with a water cooling system to accelerate cooling, which allows the use of low-alloy compositions to achieve special strength grades and low-temperature toughness, thereby improving the weldability of the steel. However, this system is largely absent in steel sheet production plants. The alloy content (carbon equivalent) of coils is often lower than that of similar grades of steel plates, which also improves the weldability of spiral welded pipes.

More important to note is that, because the spiral welded pipe coil rolling direction is not perpendicular to the direction of the steel pipe axis (its pinch solution depends on the spiral angle of the steel pipe), while the straight seam steel pipe steel plate rolling direction perpendicular to the direction of the steel pipe axis, and thus, the spiral welded pipe material is better than the straight seam steel pipe crack resistance.

Welding Process

From the welding process, spiral welded pipe and straight seam steel pipe welding method is the same, but the straight seam welded pipe will inevitably have a lot of ding weld, so the chances of welding defects are greatly increased, and the residual stress of welding at the ding weld is larger, the weld metal is often in a three-way stress state, increasing the possibility of cracking.

Moreover, according to the submerged arc welding process, each weld should be at the arc initiation and arc extinguishing, but each straight seam welded pipe in the welded annular seam, can not achieve the condition, thus there may be more welding defects at the arc extinguishing.

Chemical composition table

Mechanical properties Chemical composition  
Yield strength Tensile strength Elongation C Si Mn S P  
MPa kg/mm² MPa kg/mm² min No larger than No larger than No larger than  
Q215A Q215B 215 22 335-410 34-42 31 0.09-0.15 0.03 0.25-0.55 0.050 0.045 0.045
Q235A Q235B



235 24 375-460 38-47 26 0.14-0.22 0.12-0.20



0.30 0.30-0.65 0.30-0.70



0.50 0.45



0.045 0.045



16Mn(Q345B) 345 35 510-600 51.60 22 0.12-0.20 0.20-0.55 1.2-1.6 0.045 0.045
X42 289 29.5 413 42.1   0.28 - 1.25 0.030 0.030
X52 358 36.5 455 46.4 0.30 - 1.35 0.030 0.030
X56 386 39.4 489 49.9 0.26 - 1.35 0.030 0.030
X60 413 42.1 517 52.7 0.26 - 1.35 0.030 0.030
X65 448 45.7 530 54.0 0.26 - 1.40 0.030 0.030
X70 482 49.2 565 57.6 0.26 - 1.40 0.030 0.030
L245 245   415   21 0.26   1.15 0.030 0.030
L290 290   415   21 0.28   1.25 0.030 0.030
L360 360   460   19 0.3   1.25 0.030 0

Product Details

Commodity Construction ASTM A106 A36 A53 Spiral Welded Black Steel Tube carbon steel spiral welded tube pipe
Grade GR.B, ST52, ST42, ST35, ST45, X42, X52, X56, X60, X70, X85
Standard ASTM A53,  ASTM A500;   GB/T3091,  GB/T3094;  DIN EN10025; DIN EN10217-2005;

BS EN10217; BS EN10219; BS EN10025;  JIS G3466

Technique ERW, Welded, Seamless, Hot Rolled, Cold Drawn
OD Size 8"to 142"Outside Diameter 219mm to 3620mm
Thickness 1.5mm - 30mm
Length 1) Single Random Length and double Random Length.
2) SRL:3M-5.8M DRL:10-11.8M or As clients requested length.
3) Fixed length(5.8m,6m,12m)
Pipe Ends 1)Plain                      2)Beveled                           3)Threaded with coupling and plastic cap
End protector 1) Plastic cap           2) Iron protector              3) as request
Surface Treatment 1) black paint            2) varnish                        3) oil or galvanized

4) anti-corrosion coated(3PE / 3LPE)

Package Loose package,bundled pipe with two slings at the both end for easy loading and discharging,End with Plastic caps.
Export To Singapore, Canada, Indonesia, Korea, USA, UK, Thailand,Saudi Arabia, Vietnam,India, Peru, Ukraine ,Brazil,South Africa, etc.

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