Name: China 550mm Outer Diameter Steel Pipe Manufacturers Suppliers Factory - Huayang Steel Pipe
Brand: Huayang
SKU: 305315822

Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of 550mm outer diameter steel pipe in China. Welcome to buy discount 550mm outer diameter steel pipe made in China here from our factory. Quality products and low price are available.

Product introduction

Product Description

550mm Outer Diameter Steel Pipe belongs to large-caliber straight seam ERW welded steel pipe, widely adopted for long-distance fluid transmission, municipal trunk pipelines, industrial infrastructure and structural engineering. Adopting advanced high-frequency electric resistance welding technology, the pipe body features uniform wall thickness, high roundness, smooth inner and outer surfaces, and integrated high-strength weld without internal burrs.

This large-size pipe strictly complies with GB/T 3091, GB/T 9711, API 5L, ASTM A53 and other international standards. Every pipe undergoes full hydrostatic testing and weld ultrasonic non-destructive inspection to guarantee airtightness and pressure resistance. Multiple anti-corrosion treatments including 3PE, FBE, internal epoxy lining and hot-dip galvanizing are optional, suitable for buried, overhead and complex harsh environments such as coastal saline soil and industrial corrosive areas. It is the mainstream large-diameter pipeline for water supply, natural gas, sewage drainage, petrochemical and bridge piling projects.

1. Basic Product Specifications

Product Name: 550mm Outer Diameter Steel Pipe
Outer Diameter: Fixed 550mm
Conventional Wall Thickness: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm; SCH standard thickness customizable
Steel Grade: Q235B, Q355B, API 5L Grade B (L245), X42, X52
Executive Standards: GB/T 3091-2015, GB/T 9711, API 5L PSL1/PSL2, ASTM A53 Gr.B, EN 10217
Production Process: High-frequency ERW straight seam welding, online internal & external burr removal, weld stress relief heat treatment
Standard Length: 6m, 9m, 12m; customized fixed length within 12m
Applicable Medium: Tap water, natural gas, sewage, industrial circulating water, low-corrosion chemical media
Working Pressure: ≤2.5MPa for medium and low pressure trunk pipeline systems
Pipe End Treatment: 30°–45° beveled ends for welding, plain ends, plastic anti-collision end caps
Surface Treatment: Black anti-rust oil, hot dip galvanized, 2PE/3PE external anti-corrosion, internal epoxy lining
Core Features: Large flow capacity, high structural strength, stable weld performance, complete anti-corrosion solutions, wide engineering applicability

2. Core Product Advantages

2.1 Large Caliber & High Flow Transport Capacity

550mm large outer diameter provides large internal passage, effectively meeting large-flow long-distance transportation demands of water, gas and sewage. It reduces the number of parallel pipelines, simplifies project design and cuts overall engineering investment.

2.2 High-Strength Weld Structure, Zero Leakage Risk

Automated closed-loop high-frequency welding realizes full metallurgical fusion between weld and base metal, free of cracks, slag inclusion and pinholes. 100% full-length hydrostatic test and weld UT inspection eliminate leakage hazards, reliable for long-term buried trunk pipeline operation.

2.3 Uniform Wall Thickness & Excellent Mechanical Performance

Precision multi-roll forming ensures consistent wall thickness and good pipe roundness. Q355B and L245 high-strength steel options offer strong compression, bending and impact resistance, resisting external soil load and construction collision, adaptable to mountain, swamp and coastal complex terrains.

2.4 Complete Anti-Corrosion Customization

Multiple mature anti-corrosion systems are available to match different service environments: 3PE for buried long-term anti-corrosion, FBE for high-temperature chemical conditions, internal epoxy lining for clean water delivery, greatly extending pipeline service life up to 30–50 years.

2.5 High Comprehensive Cost Performance

Compared with seamless large-diameter pipes, ERW 550mm steel pipes have lower procurement cost with stable mechanical and anti-leakage performance. Low later maintenance and replacement frequency significantly reduce the whole life cycle cost of large infrastructure projects.

3. Dimensional Tolerance Standard

Inspection Item	Standard Tolerance
Outer Diameter (550mm)	±1.0% of nominal OD
Wall Thickness	+15% / −12.5%
Straightness	≤1.8mm per meter
Out-of-Roundness	≤1.0% of outer diameter
Pipe Length	+150mm / −0mm

4. Mechanical Properties

Steel Grade	Min. Yield Strength	Tensile Strength	Min. Elongation	Factory Test Standard
Q235B	≥235MPa	375–500MPa	≥26%	100% hydrostatic + flattening + bend test
Q355B	≥355MPa	470–630MPa	≥21%	100% hydrostatic + flattening + bend test
API 5L Grade B (L245)	≥245MPa	415–655MPa	≥20%	100% hydrostatic + weld ultrasonic inspection

Note: Low-temperature impact test and sour service inspection can be provided for special engineering requirements.

5. Manufacturing Process

Raw Material Inspection: Strictly test chemical composition and mechanical properties of hot rolled steel strips, eliminate unqualified raw materials
Multi-Roll Continuous Precision Forming: Gradual rolling forming to guarantee uniform roundness and wall thickness of 550mm pipe blank
High-Frequency ERW Fusion Welding: Automatic parameter control to stabilize weld fusion depth and welding quality
Online Internal & External Burr Removal: Mechanical scarving to remove welding burrs and smooth inner wall
Weld Stress Relief Heat Treatment: Eliminate welding residual stress to prevent weld cracking
Sizing & Straightening: Precision sizing to standard 550mm outer diameter, straightener to correct pipe linearity
Fixed-Length Cutting: Neat burr-free cutting according to customer required length
Full Performance Inspection: 100% hydrostatic pressure test, weld non-destructive flaw detection and full dimensional recheck
Surface Treatment & Marking: Anti-rust oil or anti-corrosion coating construction, permanent laser marking of specification, grade, standard and batch number
Export Standard Packaging: PE film wrapping, high-strength steel strip bundling, plastic end caps for pipe end protection

6. Main Application Scope

Municipal Engineering: Urban main water supply pipelines, large-scale natural gas transmission trunk lines, urban sewage and rainwater drainage main pipes
Water Conservancy Projects: Reservoir diversion pipelines, large irrigation trunk pipes, cross-regional water transfer supporting pipelines
Petrochemical Industry: Low-pressure crude oil, refined oil and industrial circulating water transmission pipelines
Construction & Infrastructure: Bridge foundation steel pipe piles, steel structure support pipes, large fire-fighting main pipelines
Overseas EPC Projects: Large municipal, energy and industrial park pipeline projects in Southeast Asia, Middle East and Africa

7. Quality Inspection & Certification

Fully compliant with GB/T 3091, API 5L, ASTM A53 and other international pipeline standards
ISO 9001 quality management system certified production
Complete Mill Test Report (MTR) and factory qualification certificates provided with each batch
Support SGS, BV, DNV third-party on-site sampling inspection and project acceptance
Full batch traceability from raw steel strip to finished pipe delivery

8. Packaging & Delivery

Packaging: Black pipes coated with anti-rust oil, bundled with steel strips and covered with waterproof woven cloth; anti-corrosion coated pipes wrapped with thick PE film, plastic protective caps for both ends
Product Marking: Laser marking including outer diameter, wall thickness, steel grade, execution standard, batch number and production date
Trade Terms: FOB, CIF, CFR, DAP global delivery available
Shipping Ports: Tianjin, Qingdao, Shanghai, Ningbo
Customization Service: Custom wall thickness, fixed length, full set anti-corrosion coating and special pipe end processing
Delivery Cycle: Regular stock specifications within 7–10 working days; customized anti-corrosion products 10–20 working days

9. Why Choose Our 550mm Outer Diameter Steel Pipe

Large-caliber professional production line, stable dimensional accuracy and consistent batch quality
Strict full-process quality control, 100% pressure and weld inspection to avoid defective products
Diversified anti-corrosion technical schemes to adapt to various buried and exposed working environments
Factory direct sales without intermediate links, competitive price for large-scale trunk pipeline projects
Rich overseas large pipeline project supply experience, meet international engineering acceptance standards
Professional technical team provides free pipeline matching and installation technical support

About us

Company gate (overlooking view)

Hebei Huayang Steel Pipe Co., Ltd. was founded in 2005, with a registered capital of 500 million yuan. The company covers an area of more than 1,000 mu, with annual sales of 10 billion yuan, more than 600 employees and an annual productivity of 2.75 million tons. The company has 17 new automatic steel pipe production lines and 14 high-frequency production lines, with a diameter of 73-660 mm; Three double-sided submerged arc welded steel pipe production lines with diameters of 406.4-1422.4mm;; 24 hot tube expanding production lines, with a diameter of 230-820mm; Two anticorrosion steel pipe production lines with a diameter of 73-1626 mm; 2 automatic painting production lines. With 3 branches and 5 offices, the products are sold to various cities and exported to more than 80 countries such as Southeast Asia, Middle East, Europe and America.

Packaging, transportation and delivery

Steel pipe packaging and loading scene

Packaging, transportation and delivery

At Hebei Huayang Steel Pipe Co., Ltd., we apply standardized and reliable packaging solutions for all our steel pipe products. Our pipes can be securely packed by hexagonal bundling or circular bundling according to product diameter, wall thickness and customer requirements. Each pipe end is protected with high‑strength plastic pipe caps to avoid collision damage, dust and moisture during transportation and storage. The whole bundle is firmly wrapped with durable woven bags to enhance stability and prevent scratches or deformation.

We support a complete range of transportation methods to satisfy global customers, including road transportation, railway transportation, sea freight and container shipping. Based on our strategic location in Cangzhou, Hebei Province, we enjoy convenient access to major ports such as Tianjin Port, which greatly improves logistics efficiency and reduces transportation costs.

For standard specifications and normal order quantities, the general delivery time is about 30 days after order confirmation and deposit receipt. For large‑scale orders, special sizes or customized processing requirements, our production and sales team will formulate a detailed production plan and provide an accurate delivery schedule accordingly to ensure on‑time supply and stable performance for projects and clients worldwide.

Strict quality control

1. During and after the production, experienced quality inspectors randomly check the products to ensure that each steel pipe is qualified for production and application.

2. A nationally recognized laboratory with CNAS certification and certification by French Classification Society.

3. Have CNOOC access certificate, KOC oil company access network, ADNOC Abu Dhabi oil company access network, Petrobras access network, etc.

4. Accept the inspection by the third party designated/paid by the buyer, such as SGS and BV.