Spiral Steel Pipe Manufacturer & Supplier – Sino East Steel Group
Sino East Steel Group is a professional spiral steel pipe manufacturer and supplier headquartered in Tianjin, China. Since 2008, we have exported spiral welded (SSAW) steel pipes to more than 80 countries across the Middle East, Southeast Asia, Africa, Europe and the Americas. As a factory-direct supplier with our own spiral pipe production lines, we eliminate middleman costs and deliver certified spiral pipes at competitive wholesale prices, with MOQ starting from 5 tons and a standard 20–30 day delivery window.
Spiral welded steel pipe is produced by forming steel strip at a helix angle and welding the spiral seam with submerged arc welding (SAW). This process allows large diameters to be produced economically from narrower strip, which is why SSAW pipe dominates large-diameter water, oil and gas transmission projects worldwide. Our plant covers 50,000 m² with dedicated spiral forming, double-sided submerged arc welding, ultrasonic testing and hydrostatic testing workshops, supporting an annual output of over 80,000 tons of spiral pipe. Whether you are a water utility, an oil and gas contractor, a piling contractor or a national distributor, our export team offers one-stop sourcing: size selection, standard compliance, end preparation, coating, packing and sea freight.
Why Choose Sino East Steel Group as Your Spiral Pipe Supplier?
International buyers evaluate a spiral steel pipe supplier on four factors: product quality, certification, price stability and delivery reliability. The following sections explain how Sino East Steel Group performs on each of them, and why thousands of global buyers choose us as their long-term spiral welded pipe manufacturer and supplier.
1. Factory-Direct Manufacturing, No Middlemen
We are not a trading company. Our factory directly controls the entire process from coil purchasing, slitting, spiral forming, double-sided submerged arc welding, ultrasonic testing and hydrostatic testing to final inspection. This vertical integration allows us to offer prices that are typically 5–10% lower than trading companies while maintaining consistent quality, because there is no broker margin in the supply chain. When you buy from Sino East Steel Group, you buy directly from the production source, which also means faster communication, faster quotations and faster problem-solving during the whole cooperation period.
2. Full International Standards Compliance
Our spiral pipes are manufactured and tested according to internationally recognized standards, including API 5L (line pipe), ASTM A252 (piling pipe), ASTM A139, EN 10217 and GB/T 9711. Each batch is accompanied by a mill test certificate (MTC) with chemical composition and mechanical property data, allowing customs clearance and third-party inspection to proceed smoothly. Our quality management system is certified to ISO 9001:2015, and our documentation team is experienced in preparing certificates of origin and all shipping documents needed for letter of credit transactions.
3. Stable Quality with Multi-Step Inspection
Quality is built through process control, not just final inspection. Our quality control system covers five key checkpoints: incoming coil verification, forming parameters, weld seam quality, non-destructive testing and dimensional measurement. Every production lot undergoes chemical analysis, tensile testing, flattening tests, bend tests, 100% ultrasonic inspection of the weld seam and hydrostatic testing in accordance with the requested standard. We also accept third-party inspection by SGS, BV or Intertek before shipment, at the buyer’s request, and we welcome overseas buyers to visit our factory in Tianjin to witness the production process in person.
4. Flexible Supply for All Project Scales
From a 5-ton trial order for local distributors to 5,000-ton national pipeline project deliveries, our production scheduling and warehouse stock (normally 6,000–10,000 tons of finished spiral pipes) allow us to support urgent orders and staggered deliveries across multiple shipments. Our sales engineers work with buyers to split large orders into weekly or monthly delivery schedules, which reduces the buyer’s warehousing cost and keeps project sites running without interruption. For project tenders, we can also provide pre-qualification documents, technical datasheets and reference lists from completed projects.
Spiral Steel Pipe Product Range
Water Transmission Spiral Pipe
For municipal water supply, irrigation and drainage projects, we supply spiral welded pipes in diameters from 219 mm to 3,620 mm with wall thicknesses from 5 mm to 30 mm. Water pipe can be supplied with plain ends, beveled ends or with flanged and rubber-gasket joints for fast field installation. For potable water applications we can apply internal cement mortar lining and external fusion-bonded epoxy (FBE) or 3-layer PE coating per AWWA C200 and EN 10289, ensuring decades of corrosion-free service. The smooth spiral weld and uniform wall make spiral pipe an economical and reliable choice for long-distance water transmission lines.
API 5L Spiral Line Pipe (SSAW)
For oil and gas transmission, we supply spiral line pipe to API 5L grades B, X42, X52, X60 and X65, in sizes from 219 mm to 1,420 mm. SSAW line pipe combines the strength of submerged arc welding with the dimensional flexibility of spiral forming, and is widely used for medium-pressure cross-country pipelines. Each API 5L shipment includes the required MTC with chemical and mechanical test data, and we can arrange third-party inspection, NDT reports and hydrostatic test certificates as required by the project specification.
Steel Pipe Piling (ASTM A252)
For foundation engineering, we supply spiral welded steel pipe piles to ASTM A252 grades 2 and 3, widely used in port construction, bridge foundations, building foundations and offshore structures. Pipe piles are supplied in long lengths with plain or beveled ends for field welding, and can be cut to exact project lengths on request. Spiral pipe piles offer high load-bearing capacity, excellent soil displacement properties and reliable weldability in the field, making them the preferred piling solution for major infrastructure projects across Southeast Asia, the Middle East and Africa.
Low-Pressure Industrial Spiral Pipe
For ventilation, dust collection, structural and general low-pressure service, we supply spiral welded pipe to GB/T 9711, ASTM A139 and EN 10217 standards in Q235B and Q345B grades. These pipes are an economical option for large-diameter air ducts, chimney liners, grain silo downpipes and structural columns, and can be supplied with spiral rib stiffening or perforated patterns for specialized applications.
Spiral Steel Pipe Specifications
| Parameter | Available Range |
|---|---|
| Outer Diameter | 219 mm – 3,620 mm (8″ to 142″) |
| Wall Thickness | 5.0 mm – 30.0 mm |
| Standard Length | 6 m, 12 m, or custom cut to project length |
| Weld Process | Double-Sided Submerged Arc Welding (SSAW) |
| Standards | API 5L, ASTM A252, ASTM A139, EN 10217, GB/T 9711 |
| Steel Grade | Q235B, Q345B, A252 Gr.2/3, API 5L Gr.B/X42/X52/X60/X65 |
| Pipe Ends | Plain End, Beveled End, Flanged, Grooved |
| Coating | Bare, Black Paint, 3PE, FBE, Cement Mortar Lining (on request) |
| Testing | 100% Ultrasonic Weld Inspection, Hydrostatic Test, MTC |
| Certification | ISO 9001, Mill Test Certificate, SGS/BV/Intertek inspection available |
Typical Weight Reference (kg/m)
| OD (mm) | Wall 6mm | Wall 8mm | Wall 10mm | Wall 12mm |
|---|---|---|---|---|
| 219 | 31.5 | 41.6 | 51.5 | 61.3 |
| 325 | 47.2 | 62.5 | 77.7 | 92.6 |
| 426 | 62.1 | 82.5 | 102.6 | 122.5 |
| 530 | 77.5 | 103.0 | 128.2 | 153.3 |
| 630 | 92.3 | 122.7 | 152.9 | 182.9 |
| 820 | 120.4 | 160.2 | 199.7 | 239.1 |
| 1020 | 150.0 | 199.7 | 249.0 | 298.2 |
| 1220 | 179.6 | 239.1 | 298.3 | 357.4 |
Note: weights calculated with density 7.85 g/cm³. Heavier walls up to 30 mm available on request.
Typical Applications of Spiral Steel Pipe
- Water supply & irrigation – municipal water transmission, desalination outfalls, irrigation trunk lines
- Oil & gas – cross-country transmission pipelines, gathering lines, refinery cooling water systems
- Foundation piling – port jetties, bridge foundations, high-rise building piles, cofferdams
- Drainage & sewage – storm water drainage, sewage trunk lines, sea outfall pipes
- Industrial plants – cooling water circuits, air ducts, ash handling lines, process water piping
- Structural – large columns, marine structures, tunnel linings, temporary works
Why Spiral Welded Pipe for Large Diameters?
When a project requires pipe above roughly 20 inches in diameter, spiral welded (SSAW) pipe is usually the most economical manufacturing route. The spiral forming process uses standard-width steel strip, which means large diameters do not require specialized wide plate, reducing material cost and enabling fast production cycles. The double-sided submerged arc weld is as strong as the parent metal, and because the weld runs helically, a spiral pipe can be produced in continuous lengths limited only by transport, with uniform mechanical properties along the entire pipe. Compared with longitudinal welded (LSAW) pipe, SSAW offers lower cost for equivalent service in the medium-pressure range, while still meeting API 5L and EN 10217 requirements. Compared with welded ERW pipe, spiral pipe can reach much larger diameters, making it the standard choice for water transmission mains and large-diameter oil and gas lines. Our engineers help buyers compare SSAW, LSAW and ERW against the actual project pressure, diameter and budget, and confirm the most cost-effective specification before quotation.
How We Ensure Reliable Export Service
Export Experience Across 80+ Countries
Since our first export shipment in the 1990s, we have delivered spiral steel pipes to water utilities, contractors and project owners in the Middle East, Southeast Asia, Africa, South America, Europe and North America. Our team understands the documentation, packaging and shipping requirements of different destination countries, including the Middle East SASO/IECEE certification requirements and the African market’s preference for end-protected, waterproof-packed pipes suitable for long sea voyages and tropical climates.
Professional Export Documentation
Every export order is supported by a complete documentation set: commercial invoice, packing list, bill of lading, mill test certificate, certificate of origin (CO or COO), and, where applicable, insurance certificate, hydrostatic test reports and pre-shipment inspection reports. For letter of credit (L/C) transactions, our documentation team ensures that all documents are presented exactly as required by the L/C terms, minimizing the risk of discrepancies and payment delays.
Flexible Payment and Incoterms
We support flexible payment terms including T/T (30% deposit and 70% balance before shipment), L/C at sight for large orders, and in some cases D/P for established customers. Regarding incoterms, we quote on EXW, FOB Tianjin, CFR or CIF basis according to the buyer’s preference, and our logistics partners provide competitive sea freight rates to major ports worldwide, including Jebel Ali, Rotterdam, Singapore, Lagos, Mombasa and Santos.
Pricing, MOQ & Delivery
- Price Range: USD 500 – 850 per ton (FOB Tianjin), depending on diameter, wall thickness, grade, coating and order quantity. We provide a firm quotation within 24 hours.
- MOQ: 5 tons for stock sizes; 20 tons for customized specifications.
- Payment Terms: T/T (30% deposit, 70% before shipment) or L/C at sight for large orders.
- Delivery: 20–30 days after deposit, depending on quantity and destination port.
- Packing: Single pipes or bundles with steel straps, end protectors, waterproof wrapping for sea transport.
- Port of Loading: Tianjin Xingang Port, China (nearest port to our factory).
Buyer’s Guide: How to Choose a Reliable Spiral Pipe Supplier
Choosing the right supplier is as important as choosing the right product. A reliable spiral steel pipe supplier should be able to answer five questions clearly: First, which standard and grade is the pipe actually manufactured and tested to, and can the supplier provide the mill test certificate with heat number traceability? Second, is the weld seam 100% non-destructively tested, and can NDT reports be provided? Third, what is the actual lead time from deposit to port of loading, including coating time if required? Fourth, how are large-diameter pipes packed and protected to prevent ovalization and end damage during sea transport? And fifth, what happens if the quality does not meet the contract specification after arrival? At Sino East Steel Group, we answer all five questions in writing within 24 hours of your inquiry, and we stand behind every shipment with a clear quality guarantee. We recommend every buyer request a mill test certificate with each shipment and, for large orders, arrange third-party inspection before shipment to protect both parties’ interests.
How to Get a Quotation
To receive an accurate factory quotation within 24 hours, please provide the following information: (1) outer diameter and wall thickness, (2) length and quantity, (3) standard and steel grade, (4) end finish and coating requirements, and (5) destination port. Our export sales engineers will confirm availability, price and delivery schedule, and send you a formal proforma invoice with mill test certificate samples.
Frequently Asked Questions (FAQ)
Q1: What is the difference between SSAW, LSAW and ERW steel pipe?
SSAW (spiral submerged arc welded) pipe is formed with a helical weld and is the most economical choice for large diameters above 20 inches. LSAW (longitudinal submerged arc welded) pipe has a straight weld and is used for the largest diameters requiring the highest quality. ERW (electric resistance welded) pipe is made with high-frequency welding and is economical for small to medium diameters up to 24 inches.
Q2: What is the maximum diameter of spiral pipe you can produce?
We produce spiral welded pipe from 219 mm up to 3,620 mm outer diameter, with wall thicknesses from 5 mm to 30 mm. Larger diameters can be produced on special order with advance scheduling.
Q3: Can you supply spiral pipe with 3PE or FBE coating?
Yes. We offer external 3-layer polyethylene (3PE) and fusion-bonded epoxy (FBE) coating, as well as internal cement mortar lining for potable water applications, per project specifications.
Q4: Do you provide hydrostatic testing and NDT reports?
Yes. Every pressure pipe shipment is hydrostatically tested, and the weld seam is 100% ultrasonically inspected. Hydrostatic test certificates and NDT reports are provided with the mill test certificate.
Q5: What is the MOQ for spiral steel pipe?
Our MOQ is 5 tons for stock sizes and 20 tons for customized specifications. Trial orders help buyers verify our quality and delivery before committing to larger volumes.
Q6: Can you supply spiral pipe piles for foundation projects?
Yes. We supply ASTM A252 Grade 2 and 3 spiral welded pipe piles in diameters up to 3,000 mm, with plain or beveled ends, cut to exact project lengths on request.
Contact Sino East Steel Group today – our sales engineers will respond with a factory-direct quotation and technical support within 24 hours.