HFW Steel Pipe For Bridge Structure DN450 EN10210 S355JRH

Product Description

HFW Steel Pipe For Bridge Structure DN450 EN10210 S355JRH is a high-performance high-frequency welded (HFW) steel pipe, strictly manufactured in accordance with EN10210 standard (EN10210-1:2006), specially developed for bridge structure engineering, including bridge supports, crossbeams, diagonal braces, bridge foundation piles, and auxiliary structural pipelines. Adopting premium EN10210 S355JRH low-alloy high-strength steel coils and advanced high-frequency welding (HFW) technology, this DN450 (outer diameter 457mm) pipe features excellent structural strength, outstanding weld reliability, precise dimensional accuracy, and strong resistance to atmospheric corrosion and fatigue damage. Designed to withstand bridge structural loads, seismic forces, and harsh outdoor environments, it is widely used in highway bridges, railway bridges, municipal viaducts, and large-span bridge projects worldwide, providing safe, durable, and standard-compliant structural pipeline solutions for bridge engineering.

Basic Product Specifications

Product Name: HFW Steel Pipe For Bridge Structure DN450 EN10210 S355JRH

Executive Standard: EN10210-1:2006 (Hot finished structural hollow sections of non-alloy and fine grain steels), compatible with EN10025-2, DIN 17100, GB/T 13793

Manufacturing Process: HFW (High-Frequency Welding), steel coil uncoiling & slitting, precision cold forming, high-frequency induction welding, weld normalization, internal/external weld bead trimming, stress-relieved heat treatment, non-destructive testing, anti-corrosion finishing

Steel Grade: EN10210 S355JRH (R: hot-rolled, H: hollow section; dedicated grade for bridge structural hollow sections)

Nominal Diameter (DN): 450mm

Outer Diameter (OD): 457mm (standard for DN450 bridge structural pipes)

Wall Thickness (WT): 8mm – 20mm, custom thick-wall up to 25mm for heavy-load bridge supports and foundation piles

Standard Length: 6m – 12m (standard for bridge construction), 9m optional, custom fixed lengths up to 15m available (matching bridge span design)

Delivery Condition: Normalized (+N), stress-relieved optional; ensures excellent toughness and anti-fatigue performance for bridge structural service

Surface Finish: Black bare steel with anti-rust oil (for on-site processing); hot-dip galvanized, epoxy zinc-rich primer + topcoat (for outdoor bridge structures, anti-atmospheric corrosion)

Pipe End: 30°–45° beveled ends (for on-site welding and flange connection); plain ends optional (for socket connection with bridge fittings)

Application: Bridge supports, crossbeams, diagonal braces, bridge foundation piles, auxiliary structural pipelines, bridge deck drainage pipelines, and other bridge structure components

Grade & Process Explanation

EN10210 S355JRH Performance: S355JRH is a dedicated grade for EN10210 structural hollow sections, with the letter "S" representing structural steel, "355" indicating minimum yield strength ≥355MPa (for thickness ≤16mm), "JR" representing room-temperature impact toughness (≥27J at 20℃), and "H" indicating hollow section application. It has stable chemical composition, excellent weldability, high anti-fatigue performance, and good atmospheric corrosion resistance, perfectly adapting to bridge structural loads, seismic forces, and long-term outdoor service. Strict control of sulfur and phosphorus content (≤0.025% each) prevents brittle fracture, ensuring structural safety of bridges.

HFW Process Advantages for Bridge Pipes: High-frequency HFW welding technology heats the steel coil edges through high-frequency induction, forging them together under pressure without filler metal, forming dense, full-penetration welds with high strength. Post-weld normalization and stress-relieved heat treatment eliminate residual stress, refine weld grain structure, and ensure weld mechanical properties are consistent with the base metal-critical for DN450 large-diameter bridge pipes to withstand structural loads and fatigue damage. HFW process features high production efficiency, precise dimensional control, and uniform wall thickness, ensuring the pipe body has excellent straightness and roundness, which is conducive to on-site assembly and welding of bridge structures.

Bridge Structure-Oriented Design: DN450 (457mm OD) is a mainstream large-caliber specification for bridge structural pipes, balancing structural strength and weight, suitable for bridge supports, crossbeams, and foundation piles. Strict dimensional tolerance and roundness control ensure stable connection with bridge fittings (flanges, brackets, connectors), reducing on-site construction errors. Optional anti-corrosion coatings (hot-dip galvanized, epoxy zinc-rich) adapt to outdoor, coastal, and humid environments, extending the service life of the bridge structure to over 50 years, meeting the long-term durability requirements of bridge engineering.

Dimensional Tolerance (EN10210 Standard)

Mechanical Properties (EN10210 S355JRH)

Note: For cold-region bridge projects, optional S355J2H grade (≥27J at -20℃) is available to meet low-temperature toughness requirements. For coastal bridge projects, additional anti-corrosion testing and Z25 thickness-direction anti-laminar tearing test are optional to resist seawater corrosion and structural fatigue.

Chemical Composition (Max. %, EN10210 S355JRH)

Residual elements: Cu ≤0.55%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.15% (max. %). Strict control of impurities and non-metallic inclusions prevents rust, fatigue cracking, and brittle fracture in outdoor bridge environments, ensuring the long-term structural stability and safety of the pipe. The steel coils are subjected to strict surface derusting, cleaning, and edge trimming before forming and welding, further improving weld quality and structural reliability.

Manufacturing Process (HFW for Bridge Structure Pipes)

Raw Material Inspection: Select high-quality EN10210 S355JRH steel coils, strictly inspect chemical composition, mechanical properties, and surface quality to ensure compliance with bridge structural requirements. Steel coils undergo derusting, oil removal, and cleaning to eliminate surface impurities.

Steel Coil Uncoiling & Slitting: Uncoil the steel coil and slit it to the precise width matching DN450 (457mm OD) pipe diameter, ensuring width uniformity and edge flatness, laying a foundation for subsequent forming and welding.

Precision Cold Forming: The slit steel strip passes through a series of forming rolls, gradually bending into an open circular section, ensuring uniform wall thickness, high roundness, and consistent dimensional accuracy of the DN450 pipe body.

High-Frequency HFW Welding: Use high-frequency induction heating to heat the edges of the formed steel strip to welding temperature (1200-1350℃), forge the edges together under pressure to form a continuous, full-penetration weld without filler metal. Intelligent welding control ensures uniform weld formation and stable quality.

Weld Bead Trimming & Normalization: Trim internal and external weld beads to ensure smooth inner and outer surfaces, avoiding stress concentration. Perform weld normalization treatment to refine grain structure and improve weld toughness, meeting EN10210 mechanical property requirements.

Stress-Relieved Heat Treatment: Perform stress-relieved heat treatment to eliminate residual stress, improve anti-fatigue performance and structural stability, avoiding cracking during bridge installation and service.

NDT Inspection: 100% ultrasonic testing (UT) of weld seams to detect internal defects; X-ray testing (RT) and TOFD detection optional for high-safety bridge projects; visual inspection of weld surface to ensure no pores, cracks, or incomplete fusion.

Hydrostatic Test: 100% pressure test at ≥1.5 times the working pressure, holding time ≥30 minutes, ensuring no leakage or permanent deformation-critical for bridge structural safety.

Anti-Corrosion Treatment (Optional): For outdoor and coastal bridges, apply hot-dip galvanizing or epoxy zinc-rich primer + topcoat to isolate atmospheric, rainwater, and seawater corrosion, extending service life.

Finishing: Cut pipes to standard lengths, process pipe ends (beveled/plain), apply anti-rust oil, and mark clearly to complete production.

Product Advantages

EN10210 S355JRH Standard Compliance: Fully meets European standard for structural hollow sections, widely accepted by global bridge engineering owners, designers, and third-party inspectors, ensuring smooth project acceptance.

Excellent Structural Strength: Minimum yield strength ≥355MPa, high tensile strength and toughness, perfectly adapting to bridge structural loads, seismic forces, and fatigue damage, ensuring bridge safety.

Stable HFW Weld Quality: Full-penetration welds without filler metal, post-weld normalization treatment, weld mechanical properties consistent with base metal, low defect rate, and long-term reliable service.

DN450 Mainstream Bridge Specification: Ideal for bridge supports, crossbeams, and foundation piles, balancing structural strength and weight, compatible with bridge fittings, reducing construction cost.

Strong Anti-Corrosion & Anti-Fatigue: Low-sulfur low-phosphorus composition + optional professional anti-corrosion coatings, adapting to outdoor, coastal, and cold environments, extending service life over 50 years.

High Precision & Easy Installation: Strict dimensional tolerance control ensures perfect connection with bridge fittings, reducing on-site construction time and errors; standard beveled ends facilitate on-site welding.

Cost-Effective & Efficient Production: HFW process has high production efficiency, suitable for large-batch production, low manufacturing cost; compared with seamless pipes, it has obvious cost advantages while meeting bridge structural requirements.

Complete Quality Traceability: Full heat number tracking, EN10210 standard Mill Test Report (MTR) provided; SGS/BV/DNV third-party inspection available to meet strict bridge engineering quality requirements.

Main Applications

Highway bridge supports, crossbeams, and diagonal braces

Railway bridge structural components and auxiliary pipelines

Municipal viaduct and overpass structural pipes

Large-span bridge foundation piles and support columns

Bridge deck drainage pipelines and auxiliary structural components

Coastal bridge structural pipes (with anti-seawater corrosion treatment)

Cold-region bridge projects (optional S355J2H grade)

Bridge reinforcement and maintenance structural pipes

Quality Inspection & Certification

Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness, and out-of-roundness to meet EN10210 standards, ensuring compatibility with bridge fittings and on-site installation.

Mechanical Property Testing: Tensile test, bend test, flattening test, Charpy impact test, and hydrostatic test; optional Z25 anti-laminar tearing test and low-temperature impact test for special bridge projects.

Non-Destructive Testing (NDT): 100% ultrasonic weld inspection; X-ray testing (RT) and TOFD detection optional for high-safety bridge projects; visual inspection of pipe body and weld surface.

Chemical Analysis: Heat-batch chemical composition analysis per EN10210, strict control of harmful elements and impurities, ensuring structural strength and corrosion resistance.

Certification: EN10210 standard Mill Test Report (MTR) provided, full heat number traceability; third-party inspection (SGS, BV, DNV) available to meet global bridge engineering acceptance standards.

Packaging & Delivery

Packaging: Pipes are bundled with heavy-duty steel strips (8-12 strips per bundle), wrapped with waterproof and anti-collision woven cloth to prevent rust, scratches, and damage during transportation and on-site storage; high-strength steel end caps are installed to protect pipe ends, avoiding deformation and contamination.

Marking: Each pipe is clearly marked with EN10210, HFW, S355JRH, DN450, 457×WT, heat number, batch number, length, manufacturing date, and "Bridge Structure Steel Pipe" identification, facilitating on-site identification and management, complying with EN10210 marking requirements.

Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for global bridge engineering projects.

Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for large-diameter structural pipes, ensuring efficient and safe global transportation, supporting timely delivery for bridge construction schedules.

Customization: Accept customized wall thickness (8mm-25mm), anti-corrosion coating (hot-dip galvanized/epoxy), lengths (matching bridge span design), and pipe ends (beveled/plain) to meet specific bridge structure project requirements.

Contact Us

For quotation, stock availability, delivery lead time, and customized technical solutions of HFW Steel Pipe For Bridge Structure DN450 EN10210 S355JRH, please contact our sales team. We have rich experience in supporting global bridge engineering projects, providing EN10210 compliant S355JRH HFW steel pipes, and professional technical support for on-site installation, welding, and anti-corrosion treatment, ensuring the safe, stable, and durable operation of your bridge structures.

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