What Are the Advantages of SAWH steel Pipe

• SAWH steel pipe can be produced in longer length (maximum length up to 50 meters) compared to LSAW steel pipes

• Due to its spiral seam SAWH pipe has an accurate diameter accuracy and strength

• The sizes are adjustable & can be tailored to end-user requirements.

Standard of SAWH steel pipe

SAWH steel pipe is made up of hot-rolled coiled steel using a double-sided submerged arc welding method. The welding process allows steel pipe manufacturers to produce large-diameter steel pipes suitable for different applications.

• Test:  Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield, strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.

• Mill Test Certificate: EN 10204/3.1B 

• Third party inspection: SGS, BV, Lloyds etc.

Surface: Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Antirust oil, Protective Coatings (Coal Tar Epoxy; Fusion Bond Epoxy, 3-layers PE)

Coating Standard:

• ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for ductile-iron Pipe and Fittings for water

• DIN 30670 Polyethylene coatings of steel and fittings

Packing:  Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips, Plastic caps.

SAWH Steel pipe type

SSAW steel pipe, HFW steel line pipe, HFW steel pipe, Galvanized spiral welded steel pipe, 3PE coated spiral welded steel pipe

SAWH Steel pipe specification:

Outer diameter:219mm-3000mm

Wall thickness: 4mm-25.4mm

Length: 6m-28m

Spiral Submerged-arc Welded Quality Assurance

Spiral welded pipe production by submerged arc method is based on using tandem welding technique for joining inside and outside coil edges, which have been trimmed and beveled by carbide milling for high quality weld structure.

Listing some notes You must know

• Oiled marking: Steel after passing wrer oiled to prevent corrosion,and according to user requirements for making.

• Leveling Milling: The flat steel anvil machine so that the origal curl,and then thouth the edge milling machine for two-sided steel milling,so as to meet the requirements of the plate width,plate edge parallelism and groove shape.

• Shear molding: The steel plate production line along the outer edge of the spiral curl into a tube.

• Butt cut: Double-sided submerged arc welding using advanced technology to pre-welding,internal welding,outside wilding.The welded steel pipe using a plasma-foot cut to specification length.

Note:

Welding of hot rolled steel coils takes spiral form after passing through preforming and forming rolls. Excellent exterior weld quality at high production speeds is provided by double submerged arc welding process. Manufactured pipes are cut to the desired lengths at the exit of the pipe machine. Pipe ends are beveled by means of carbide machining for accurate on-site welding.

After the pipe is conveyed to hydrostatic testing and off-line ultrasonic testing and/or real time X-ray inspection, the pipe will be subject to final inspection for the compliance to customer requirements.

Starting from incoming control up to the final inspection stage; entire process is monitored and supported by computerized system. Traceability is achieved by input controls and barcodes through entire production lines.