S355 Structural Spiral Pipes

The SSAW steel pipe is a spiral pipe made from high-grade steel: Q235AB, X42, or L290. During the roll forming process, we keep the rolls askew in an adjustable angle from parallel with billet center line while at the same time, welding the seam continuously. The resulting pipe is available in large internal diameters. Prior to welding, the wire electrode and flux will be closely checked for any defects. Before roll forming, the steel sheet or strip has to go through flattening, trimming, and surface cleaning. After welding, the weld seam will receive ultrasonic testing and X-ray inspection.

SSAW steel pipe is one of our core products. It is widely used to transfer oil or gas in the underground pipeline. Upon request, we can apply FBE coating or 3LPE coating to the pipe surface to protect the pipe against corrosion.

General Process Flow
Uncoiling - Straightening - Coil Joiner - Straightening - Edge Milling - Delivery - Pre-bending - Spiral Forming - Tack Welding - Plasma Cutting - Tab Welding - Internal & External Submerged Arc Welding - Tab Removal - Weld Grinding - Automatic Ultrasonic Testing - X-Ray Testing - Pipe End Expansion - Hydrostatic Testing - End Facing/Beveling - Ultrasonic Testing - X-Ray & Film Examination - Final Inspection - Weighing & Measuring - Coating - Marking

External Coating

Internal Coating
Single-Layer FBE Coating

Standard: API RP 5L2-2002, DEP 31.40.30.35-Gen-2005

1 Outside Diameter: 219.1 mm - 2540mm (8"-100")
2 Wall Thickness: 6mm - 25.4mm Length:6 - 22 m
3 Standard: API 5L, API 5CT, GB/T9711.1, SY5037-2000
4 Steel Material: Q235A, Q235B, Q345, ASTM A53/106, API 5L GR.A/B, L245 L290 X42 X46 X70 X80, S355, S275 etc.
5 Process: Spiral Submerged- Arc Welding
6 Surface Treatment: Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating or as per customer's requirement
7 Usage: Used for low pressure fluid delivery, such as water, gas, and oil; construction and piling, chemical industry, power plant, offshore platform etc.
8 Test: Chemical Component Analysis, Mechanical Properties (ultimate tensile strength, yield strength, percentage elongation), Technical Properties (flattening test, bending test, blow test, impact test, exterior size inspection, hydrostatic test, X-ray test)