SSAW steel pipe specification
|Product||SSAW steel pipe|
|Keyword||spiral pipe/spiral welded pipe/SSAW pipe|
|Outer diameter||219 MM - 2020MM|
|Wall thickness||5.0mm- 28mm|
|Surface||3LPE COATED OR BARE|
|Usage||Piling, Structure,oil and gas, water transportation|
|Ends||Plain/ beveled ends with plastic caps|
SSAW steel pipe standard
|Specification||Wall thickness||Weight/1 meter||Water pressure GB/T9711.1-1997||Water pressure|
GB/T9711.1-1997 National standard, also known as the oil and gas industry transport steel pipe
SY/T5037-2000 also known as the common fluid pipeline with spiral seam submerged arc welded steel pipe
Advantages of SSAW steel pipe
When the strip steel is fed into the spiral pipe welding machine, it will automatically become a spiral and be welded continuously, and the welded steel pipe will almost become an accurate circle.
Spiral steel pipe adopts cold-rolled strip steel, whose thickness tolerance is much lower than that of the hot-rolled steel plate and strip steel, which is extremely important for obtaining a good weld.
An important advantage of spiral steel pipes is that as long as the pipe can be transported, the length of the pipe can be produced, which minimizes the number of connecting flanges required for the finished pipe.
The production process of SSAW steel pipe
The first step is to determine the raw materials. All the raw materials must undergo strict inspections including physical and chemical before being put into use.
The second is welding technology. The technology can be divided into single-wire welding or double-wire submerged arc welding and using the automatic submerged arc welding to repair the welding seam after coiling into the steel pipe.
The third is shaping. Before the forming, the strip needs to be surface cleaned, trimmed, planed, leveled conveyed, and pre-curved. At the same time, in order to ensure the smooth conveyance of strip steel, electric contact pressure gauges are needed to control the pressure of the cylinders. The fourth is that when using the weld gap control device, it is necessary to ensure that the weld gap can meet the weld requirements. Both internal welding and external welding are single-wire or double-wire submerged arc welding using American Lincoln electric welding machines to ensure welding quality.
Fifthly, all of the welds after welding are examined by an online sequential automatic flaw instrument, which guarantees 100% damage-free testing coverage of the welds and prevents the production of defective products.
The sixth is that after the completion of the product, the steel pipes need to be divided into individual pipes with an air plasma cutting device. At the same time, every steel pipe needs to pass the hydro-static pressure test, and the pressure adopts a radial seal.
DSAW vs SSAW vs ERW vs LSAW steel pipe
Compared with SAW (Submerged Arc Welding), the ERW welding process is importantly different in that no chemical composition can be added during the welding process. The quality of ERW welding is more importantly dependent on the quality of the base material. In recent years, due to the base material (hot-rolled coil), such as purity, is greatly improved, so although the quality of the weld slightly deteriorates during the resistance welding process, it can still meet the quality requirements.
DSAW generally consists of two independent welding wires (also called arc), and the welding current passes through the two welding wires to form a common molten pool. The diameter of LSAW steel pipe is restricted by the width of steel plate, and only one diameter of steel pipe can be produced by one width of steel plate