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Large-Diameter Heavy-Wall Spiral Steel Pipe

large-diameter heavy-wall spiral steel pipe is manufactured by spiral forming of hot-rolled steel strip followed by double-sided submerged arc welding (SSAW). It is engineered for high-pressure transmission, long-distance pipelines, heavy-load foundations, and large-scale infrastructure projects.

The pipe features high dimensional stability, uniform wall thickness, excellent hoop strength, and reliable weld integrity, making it suitable for oil & gas, water conveyance, thermal networks, piling, and structural applications.

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Product Details

Large-Diameter Heavy-Wall Spiral Steel Pipe

1. Product Type

Product Name: Large-Diameter Heavy-Wall Spiral Welded Steel Pipe

Manufacturing Process: SSAW (Spiral Submerged Arc Welded)

Welding Method: Internal and external submerged arc welding

Pipe Shape: Round

Customization: OD, wall thickness, length, end type and coating can be customized

2. Size Range

Item	Specification
Outer Diameter (OD)	Φ219 mm – Φ3620 mm
Nominal Diameter (DN)	DN200 – DN3600
Wall Thickness	6 mm – 25.4 mm standard; heavy-wall up to 40 mm or customized
Pipe Length	6 m, 9 m, 12 m standard; max. approx. 18 m or custom upon request
Forming Angle	Adjustable to meet project OD requirements

Typical heavy-wall reference: 25.4 mm wall thickness for high-pressure and heavy-duty service.

3. Specification Table (Typical SSAW Heavy-Wall Sizes)

OD (mm)	Inch	Wall Thickness Range (mm)	Common Heavy-Wall (mm)
219	8"	6 – 12	10 – 12
273	10"	6 – 14	12 – 14
325	12"	6 – 16	12 – 16
377	14"	6 – 18	14 – 18
406	16"	6 – 20	16 – 20
508	20"	6 – 22	18 – 22
610	24"	6 – 25.4	20 – 25.4
711	28"	8 – 25.4	22 – 25.4
813	32"	8 – 25.4	22 – 25.4
914	36"	8 – 25.4	22 – 25.4
1020	40"	8 – 25.4	22 – 25.4
1220	48"	8 – 30	25 – 30
1422	56"	10 – 30	25 – 30
1620	64"	10 – 30	25 – 30
1820	72"	10 – 30	25 – 30
2020	80"	10 – 35	25 – 35
2220	87"	10 – 35	25 – 35
2620	103"	10 – 35	25 – 35
3020	119"	12 – 40	30 – 40
3620	143"	12 – 40	30 – 40

Dimensions can be produced non-standard according to project drawings.

4. Steel Grades & Materials

Common Domestic Grades

Carbon structural steel: Q235A/B/C, Q355B/C/D

Low-alloy steel: Q345B, 16Mn

Pipeline steel: L245, L290, L320, L360, L415, L450, L485

High-grade line pipe: X42, X46, X52, X56, X60, X65, X70, X80

International Equivalent Systems

API 5L: Grade B – X80, PSL1 / PSL2

ASTM: A252 Gr.1/2/3, A53, A139

EN: S235JRH, S275JRH, S355J2H

EN 10217 / EN 10219

ISO 3183

5. Executive Standards

GB/T 9711 — Petroleum and natural gas industries steel pipe for pipelines

SY/T 5037 — Spiral submerged arc welded steel pipe for fluid conveyance

API Spec 5L — Specification for line pipe

ASTM A252 — Welded and seamless steel pipe piles

EN 10217 / EN 10219 — Welded steel tubes for pressure and structural purposes

ISO 3183 — Petroleum and natural gas industries steel pipe

6. Mechanical & Performance Features

High yield and tensile strength depending on steel grade

Excellent internal pressure resistance

Spiral weld provides favorable stress distribution

Good roundness and dimensional stability

High resistance to deformation, impact and fatigue

Suitable for deep burial, high-pressure and heavy-load conditions

Compatible with various internal linings and external coatings

Typical performance for heavy-wall structural service:

Yield Strength: ≥235 MPa for Q235 series; higher for Q355/X-grade steels

Tensile Strength: ≥375–570 MPa depending on grade

Working Pressure: selected according to OD, WT and steel grade

Service Temperature: standard atmospheric to low/high temperature by grade selection

7. End Preparation

Plain End (PE)

Beveled End (BE), typically 30° bevel with root face

Square cut for piling

Flanged ends available on request

End protectors: steel caps or plastic caps

8. Surface Treatment & Anti-Corrosion Options

External Coating

Black varnish / anti-rust oil

3PE / 3PP coating

FBE (Fusion Bonded Epoxy)

Coal tar epoxy

Polyurethane insulation

Galvanized or polyethylene jacket for thermal insulation pipes

Internal Lining

Cement mortar lining

Liquid epoxy coating

IPN8710 drinking-water coating

FBE internal coating

9. Testing & Inspection

Each pipe is subject to full quality control:

Visual inspection

Dimensional inspection (OD, WT, length, ovality)

Online ultrasonic testing (UT) of weld seam

X-ray / radiographic inspection (RT)

Hydrostatic pressure test

Flattening / flatten test

Impact test, tensile test, hardness test

Chemical composition analysis

Mill Test Certificate (MTC) supplied

Laboratory equipment includes:

Spectrometer

Universal testing machine

Impact testing machine

Metallographic microscope

Magnetic particle inspection

10. Typical Applications

Long-distance oil and natural gas transmission pipelines

City gas distribution and gate stations

Large-scale water supply and drainage projects

Raw water conveyance and water diversion

District heating and thermal insulation pipelines

Chemical plant process pipelines

Mine slurry, tailings and ash slurry pipelines

Bridge pile foundations and port steel pipe piles

Offshore platforms and marine structures

Structural columns and heavy-load supports

11. Packing & Delivery

Loose packing for large OD pipes

Bundle packing for small/medium OD

End caps and surface protection

Shipping marks as per customer requirement

Delivery by container or bulk vessel

Standard export packing suitable for sea freight

12. Short Sales Description

supplies large-diameter heavy-wall spiral steel pipes from Φ219 mm to Φ3620 mm, with wall thickness up to 40 mm. Produced by double-sided submerged arc welding, the pipes comply with GB/T 9711, API 5L, ASTM A252 and EN standards. They are widely used in oil & gas pipelines, water transmission, thermal networks, piling and structural engineering, and can be supplied with 3PE, FBE, epoxy or polyurethane insulation systems.