Spiral Submerged Arc Welded (SSAW) Steel Pipe 

High-Strength Spiral Welded Steel Pipe (SSAW) | API 5L & ASTM A53 Pipeline Steel | Large Diameter Oil, Gas & Water Transmission Pipe - [SONGCHENSTEEL]

01. Product Overview

Our Spiral Submerged Arc Welded (SSAW) Steel Pipe is manufactured using advanced double-sided submerged arc welding technology. By spirally winding high-quality steel strips and welding them at precision angles, we produce pipes that offer exceptional structural strength and dimensional accuracy, especially for large-diameter requirements.

Available in a comprehensive range of carbon and alloy steels, including high-pressure boiler grades and low-temperature pipeline grades, our pipes are the cornerstone for major infrastructure projects. Whether it's for natural gas transmission, urban water supply, or structural piling, we provide reliable, high-performance solutions.

02. Key Features & Advantages

l  Precise Engineering & Large Diameters

Ø  Feature: Spiral forming process with double-sided submerged arc welding (DSAW).

Ø  Advantage: Higher internal pressure resistance and superior circularity compared to traditional straight seam pipes in large diameters.

Ø  Benefit: "Cost-Effective Infrastructure."Allows for the construction of ultra-large diameter pipelines (up to 3020mm) with high reliability and lower project costs.

l  Extensive Material Versatility

Ø  Feature: Supports a vast array of grades from standard carbon (20#, Q355) to specialized alloy (A335 P91, 15CrMoG, L415N).

Ø  Advantage: Engineered for specific environments—high temperature, high pressure, or extreme low temperature (A333 Gr.6).

Ø  Benefit: "One-Stop Solution." No matter the medium or climate—steam, crude oil, or freezing water—we have the exact grade for your safety needs.

l  Superior Anti-Corrosion Protection

Ø  Feature: Available in natural finish or advanced plastic color coating.

Ø  Advantage: Forms an impenetrable barrier against soil chemicals, moisture, and electrochemical corrosion.

Ø  Benefit: "Maintenance-Free Longevity." Extends the service life of underground pipelines to over 30-50 years, significantly reducing inspection costs.

l  Rigorous Quality Assurance

Ø  Feature: 100% Non-Destructive Testing (NDT), including X-ray and Ultrasonic testing (UT).

Ø  Advantage: Ensures zero leakage and eliminates any potential welding defects or cracks.

Ø  Benefit: "Risk-Free Transmission." Provides peace of mind for high-risk gas and oil transport where safety is non-negotiable.

03. Technical Specifications

04. Versatile Applications

l  Oil & Gas Transmission

The primary choice for long-distance pipelines (API 5L) carrying crude oil and natural gas across continents.

l  Water Supply & Drainage

Used for urban water mains and large-scale water diversion projects (South-to-North Water Diversion, etc.).

l  Power Plants & Heating

High-alloy grades (P91, 15CrMoG) are essential for high-pressure steam pipelines and district heating systems.

l  Construction & Piling

Commonly used as high-strength piling pipes for bridges, docks, and high-rise building foundations (ASTM A252).

05. Why Choose Us?

1. Global Certifications

Certified by API 5L and compliant with international standards like

ASTM and EN.

2. Advanced Testing

Every pipe undergoes high-pressure hydrostatic testing and full-body ultrasonic scanning.

3. Massive Capacity

High-speed spiral production lines ensure 7-14 days rapid delivery for standard sizes.

4. Custom Engineering

We provide specialized internal and external coatings (epoxy, 3PE) tailored to your soil conditions.

06. Packaging & Logistics

l  Lead Time: 7-21 days (Standard sizes available in stock).

l  Loading Port: Tianjin / Qingdao / Shanghai.

l  Payment Terms: T/T, L/C at sight.

l  Shipping: Professional loading for large-diameter pipes to prevent deformation; export-standard seaworthy packaging ensures undamaged delivery.

07. FAQ

Q1: What are the advantages of Spiral Welded Pipe (SSAW) compared to LSAW pipes?

Ø  Cost-Effective for Large Diameters: For diameters >DN500 (508mm), SSAW is significantly cheaper as large diameters can be produced from narrower steel strips.

Ø  Pressure Resistance: The weld is at an angle (45°-75°) to the pipe axis, distributing stress more uniformly. Theoretically, the weld carries less pressure than in a longitudinal pipe of the same spec.

Ø  Superior Circularity: The spiral forming process naturally ensures pipe roundness, minimizing ovality deviation.

Ø  Flexibility: For the same spec, SSAW pipes have lower flexural rigidity, better adapting to soil settlement and thermal stress.

Q2: What is the maximum diameter you can produce?

Ø  Outer Diameter (OD): 219mm - 3020mm.

Ø  Wall Thickness (WT): 5mm - 30mm (Heavier walls possible for larger diameters).

Ø  Length: Standard 6m / 12m; custom fixed lengths supported (5.8m for container loading).

Q3: What is the difference between API 5L PSL1 and PSL2?

Ø  PSL1: Basic requirements. Chemical composition is standard. NDT is non-mandatory. Used for general fluid transmission.

Ø  PSL2: Stricter. Limits Carbon (≤0.22%) and Carbon Equivalent (CE). Requires impact toughness testing and 100% weld NDT. Full traceability per pipe. Essential for oil/gas pipelines and high-pressure sour service.

Advice: Oil/Gas long-distance pipelines → Must specify PSL2; General water supply → PSL1 is sufficient to save cost.

Q4: Which steel grades do you support? Which one should I choose for my project?

Ø  Low Pressure/Structural: Q235B, A53B, 20#, Q355B (General water, fire fighting, bridge piling).

Ø  Oil & Gas Pipelines: L245N - L415N (API 5L Gr.B - X60).

Ø  High Temp/Pressure: A106 Gr.B, SA106B, 15CrMoG, 12Cr1MoVG (Boilers, steam pipelines).

Ø  Ultra-Critical Power: A335 P91 (Main steam lines).

Ø  Low Temperature: A333 Gr.6, 16MnDG (LNG or -45°C environments).

Uncertain? Tell us the medium (water/oil/gas/steam), working temperature, and pressure, and we will recommend the grade.

Q5: What is the difference between 3PE and FBE anti-corrosion? How should I choose?

Ø  3PE (3-Layer Polyethylene): Epoxy primer + Adhesive middle + Polyethylene top. High impact resistance and soil stress resistance. Standard for buried long-distance pipelines (≤80°C).

Ø  FBE (Fusion Bonded Epoxy): Single or dual layer. Superior bonding to steel, chemical resistance, and cathodic disbondment resistance. Ideal for directional drilling/crossings (≤100°C).

Quick Rule: Buried lines → 3PE; High temp or crossings → FBE; Above-ground → Anti-rust primer or galvanizing.

Q6: How do you ensure the quality of the welding?What is your QC process?

Yes, we use a three-tier inspection system:

Ø  Raw Material: Chemical/mechanical testing for every steel coil batch.

Ø  In-Process: Online dimension monitoring and online UT weld detection.We use double-sided submerged arc welding (DSAW) technology. Quality is ensured through 100% X-ray inspection of weld seams, full-body ultrasonic scanning, and high-pressure water testing to guarantee zero leaks and zero defects.

Ø  Finished Product:Sampling for tensile, bending, impact, and hardness tests.

Q7: What end finishes can you provide?

Ø  Plain End: Square cut, suitable for field butt-welding.

Ø  Beveled End: Standard 30°-35° V-bevel with a 1.6mm root face. Ready for site welding. (Our default export spec).

Ø  Threaded: Internal/External threads for small diameters (≤219mm).

Q8: What is the MOQ and delivery time?

Ø  Standard Carbon Steel (Q235B, 20#, Q355, A53B): Stock available, MOQ 100 tons.

Ø  Alloy/Low Temp/PSL2: Custom production, MOQ 200 tons.

Ø  Delivery: 7-10 days for stock; 15-25 days for production (up to 35 days for special alloys).

Q9: How are large diameter pipes shipped? Will they deform?

Pipes >1m are shipped via Break Bulk / RO-RO vessels, not containers.

We use marine packaging specifically designed for spiral-welded steel pipes to prevent bevel damage.