SSAW Steel Pipe

SSAW steel pipes are made from hot-rolled coils, formed into a spiral shape at room temperature, and then welded using an automatic double-sided submerged arc welding process.

Hunan Standard Steel Co., Ltd. (HSCO) has 12 modern SSAW steel pipe production lines, capable of producing a full range of products with outer diameters from 219mm to 3620mm, wall thicknesses from 5.0mm to 25.4mm, and steel grades from L245 to X80 (Grade B to X80).

The production lines are equipped with two specialized production lines: one for producing spiral submerged arc welded steel pipes (SSAW) and the other for producing straight seam submerged arc welded steel pipes (LSAW), meeting the diverse needs of different projects for steel pipe types.

SSAW Steel Pipe Production Process

The production process of SSAW steel pipes is as follows:

1. Coil Inspection: Steel coils enter the production line and undergo full-board ultrasonic inspection before processing.
2. Leveling & Milling: The steel coil passes through a leveling machine to eliminate original curl, and then both edges are milled to achieve the required plate width and parallel groove shape.
3. Forming: The strip is gradually formed into a spiral tube blank through external or internal control roll forming.
4. Welding: Advanced double-sided submerged arc welding (DSAW) is used for both inner and outer welds, ensuring full penetration and stable weld quality.
5. Visual Inspection: Professional technicians check basic parameters and surface quality.
6. Ultrasonic Testing (UT): 100% ultrasonic inspection is performed on both inner and outer base metal and weld seams.
7. X-ray Detection: Internal and external welds undergo 100% X-ray television inspection, with an image processing system ensuring detection sensitivity.
8. Hydrostatic Pressure Test: Each steel pipe is tested by a hydrostatic testing machine to ensure it meets the standard pressure requirements.
9. Chamfering: Pipe ends are machined to meet the required beveling dimensions.
10. Final Inspection: X-ray and ultrasonic testing, as well as magnetic particle inspection, are conducted on pipe ends to check for welding defects.
11. Oiling & Marking: Qualified pipes are oiled for corrosion protection and marked according to customer requirements.

Main Process Characteristics of SSAW Steel Pipe

a. Uniform deformation, low residual stress: During the forming process, the steel plate deforms evenly with minimal residual stress and no surface scratches. The process offers greater flexibility in diameter and wall thickness, especially for high-grade thick-walled pipes and small-to-medium diameter thick-walled pipes.
b. Superior weld quality: Advanced double-sided submerged arc welding technology enables welding at the optimal position, minimizing defects such as misalignment, weld deviation, and incomplete penetration.
c. 100% quality inspection: The entire production process is under effective inspection and monitoring, ensuring product quality.
d. Real-time data monitoring: All equipment on the production line is networked with a computer data acquisition system for real-time data transmission. Technical parameters are monitored in the central control room.

Why Choose HSCO for SSAW Steel Pipes?

● 12 modern SSAW production lines with annual capacity of 400,000–500,000 tons
● Outer diameter: 219mm-3620mm | Wall thickness: 5.0mm-25.4mm | Steel grade: L245-X80
● API 5L, ISO 9001, CE certified
● 100% UT + X-ray + hydrostatic testing on every pipe

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