Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of en10219 s355 hfw steel pipe dn400 in China. Welcome to buy discount en10219 s355 hfw steel pipe dn400 made in China here from our factory. Quality products and low price are available.
Product introduction
Product Description
EN10219 S355 HFW Steel Pipe DN400 is a high-performance cold-formed high-frequency welded (HFW) steel pipe, strictly manufactured in accordance with EN10219 standard (EN10219-1:2006/EN10219-2:2006), specially developed for industrial fluid transmission, municipal engineering, offshore auxiliary pipelines, construction engineering, and medium-pressure gas/oil transmission projects. Adopting premium S355 low-alloy high-strength steel coils (S355JR/J0/J2/N/NL) and advanced high-frequency welding (HFW) technology, this DN400 (outer diameter 406.4mm) pipe features excellent mechanical properties, stable weld integrity, precise dimensional accuracy, and strong resistance to atmospheric, soil, and industrial medium corrosion. Designed for long-term service under medium-pressure, complex environmental conditions, it is widely used in European and global engineering projects, providing safe, reliable, and standard-compliant pipeline solutions for industrial, municipal, and offshore fields[1].
Basic Product Specifications
Product Name: EN10219 S355 HFW Steel Pipe DN400
Executive Standard: EN10219-1:2006 (Cold formed welded steel tubes for pressure purposes - Part 1: Non-alloy and fine grain steels), EN10219-2:2006, compatible with ISO 11960, GB/T 9711.1, and DIN 2458
Manufacturing Process: HFW (High-Frequency Welding), steel coil uncoiling & slitting, precision cold forming, high-frequency induction welding, weld annealing, internal/external weld bead trimming, stress-relieved heat treatment, hydrostatic testing, and anti-corrosion finishing
Steel Grade: EN10219 S355 (core grades: S355JR, S355J0, S355J2; optional S355N, S355NL for low-temperature and high-toughness projects)[1]
Nominal Diameter (DN): DN400
Outer Diameter (OD): 406.4mm (standard for DN400 industrial pipelines)
Wall Thickness (WT): 6mm – 18mm, custom thick-wall up to 22mm for high-pressure offshore and heavy-load industrial applications
Standard Length: 6m – 12m (standard for European engineering construction), 9m optional, custom fixed lengths up to 14m available
Delivery Condition: Normalized (+N) or normalized and tempered (+NT), ensuring weld toughness and resistance to stress corrosion; S355NL grade supports low-temperature service down to -50℃[1]
Surface Finish: Black bare steel with anti-rust oil (for indoor storage); 3PE/FBE anti-corrosion coating (for buried/marine applications); epoxy resin inner coating (for fluid transmission to prevent scaling and corrosion)
Pipe End: 30°–45° beveled ends (for on-site welding, standard for industrial pipelines); plain ends/flanged ends optional (for equipment and valve connections)
Application: Municipal water supply and drainage pipelines, industrial fluid (oil, gas, chemical medium) transmission pipelines, offshore platform auxiliary pipelines, construction engineering supporting pipelines, medium-pressure gas transmission pipelines, and industrial process pipelines[1]
Grade & Process Explanation
EN10219 S355 Grade Performance: S355 is a mainstream European standard low-alloy high-strength steel, with the letter "S" representing structural steel and "355" indicating the minimum yield strength of 355MPa for thickness ≤16mm[1]. Different quality grades meet diverse project requirements: S355JR (room-temperature impact, 20℃), S355J0 (0℃ impact), S355J2 (-20℃ impact), S355N (normalized, fine-grain steel), S355NL (normalized, fine-grain steel with -50℃ low-temperature impact, impact value ≥27J)[1]. All grades adopt low-sulfur and low-phosphorus composition, excellent weldability, and can be directly welded without preheating in most engineering scenarios, suitable for medium-pressure transmission and complex environmental service[1].
HFW Process Advantages for EN10219 Pipes: High-frequency HFW welding technology heats the steel coil edges through high-frequency induction, forging them together under pressure without filler metal, ensuring dense weld seams and high weld strength. The post-weld annealing and stress-relieved heat treatment (900-950℃ heating, 5-15 minutes insulation) eliminate residual stress, refine weld grain structure, and ensure weld mechanical properties are consistent with the base metal-critical for DN400 large-diameter pipelines to withstand medium pressure and structural loads. HFW process features high production efficiency, precise dimensional control, and stable quality, making it suitable for large-scale industrial and municipal pipeline construction, with cost advantages over seamless pipes while meeting EN10219 standard requirements.
DN400 Pipeline-Oriented Special Design: DN400 (406.4mm OD) is a classic large-caliber specification for industrial and municipal pipelines, balancing flow capacity and construction cost. Strict dimensional tolerance and roundness control ensure reliable connection with flanges, valves, and other fittings, reducing on-site construction errors. Professional anti-corrosion coating systems (3PE/FBE) isolate soil, seawater, and industrial media, extending the service life of the pipeline to over 30 years in harsh environments. The pipe body is designed with excellent anti-extrusion and anti-deformation performance, adapting to complex terrain of municipal construction and the corrosive environment of offshore platforms.
Dimensional Tolerance (EN10219 Standard)
|
Item |
Tolerance (DN400, OD 406.4mm) |
Remarks |
|
Outer Diameter |
±0.5% of nominal OD (±2.03mm) |
EN10219-1:2006 Class A |
|
Wall Thickness |
≤10% under nominal WT; +15% over nominal WT |
Thickness ≤12mm, stricter for thick-wall pipes |
|
Out-of-Roundness |
≤0.8% of outer diameter (≤3.25mm) |
Ensures fitting connection accuracy |
|
Straightness |
≤1.5 mm per meter |
Suitable for on-site continuous welding |
|
Length |
+150 mm / −0 mm |
Custom length tolerance negotiable |
Mechanical Properties (EN10219 S355, Reference)
|
Property |
S355JR |
S355J2 |
S355NL |
|
Minimum Yield Strength |
≥355 MPa (≤16mm) |
≥355 MPa (≤16mm) |
≥355 MPa (≤16mm) |
|
Tensile Strength |
470–630 MPa |
470–630 MPa |
470–630 MPa |
|
Elongation |
≥21% |
≥21% |
≥21% |
|
Hydrostatic Test |
100% tested at 1.5× working pressure (minimum 3.0MPa), holding time ≥30 minutes, no leakage or permanent deformation |
||
|
Charpy Impact |
≥27 J at 20℃ |
≥27 J at -20℃ |
≥27 J at -50℃[1] |
|
Flattening / Bend Test |
No cracks, weld separation or structural defects; flattening to 2/3 of outer diameter, bend test without fracture |
||
Note: For offshore and low-temperature projects, S355NL grade is recommended, with optional Z25 thickness-direction anti-laminar tearing test to meet seismic and structural load requirements[1]. For chemical medium transmission pipelines, additional corrosion resistance testing is available.
Chemical Composition (Max. %, EN10219 S355)
|
Element |
C |
Mn |
P |
S |
Si |
|
S355JR/J0/J2 |
≤0.22 |
≤1.60 |
≤0.025 |
≤0.025 |
≤0.55 |
|
S355N/NL |
≤0.20 |
≤1.60 |
≤0.025 |
≤0.020 |
≤0.55 |
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, scaling, and stress corrosion cracking in industrial media and soil environments, ensuring the long-term stability and safety of the pipeline[1]. The steel coils are subjected to strict surface derusting, cleaning, and edge trimming before forming and welding, further improving weld quality and corrosion resistance.
Manufacturing Process (HFW for EN10219 S355 Pipes)
Raw Material Inspection: Select high-quality EN10219 S355 grade steel coils (S355JR/J0/J2/N/NL) that comply with EN10219 standards, and strictly inspect the chemical composition, mechanical properties, and surface quality before production. The steel coils undergo derusting, oil removal, and cleaning to eliminate surface impurities, ensuring weld quality and structural stability of the pipe body.
Steel Coil Uncoiling & Slitting: Uncoil the steel coil and slit it to the precise width matching DN400 (406.4mm OD) pipe diameter, ensuring the 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 from a flat strip into an open circular section, ensuring uniform wall thickness, high roundness, and consistent dimensional accuracy of the DN400 pipe body.
High-Frequency HFW Welding: Use high-frequency induction heating to heat the edges of the formed steel strip to the welding temperature (1200-1350℃), then forge the edges together under pressure to form a continuous, full-penetration weld without filler metal. The welding process is controlled by an intelligent system to ensure uniform weld formation and stable quality.
Weld Bead Trimming & Annealing: Trim the internal and external weld beads to ensure the inner and outer surfaces of the pipe are smooth, avoiding medium deposition during fluid transmission. Perform weld annealing treatment to refine the weld grain structure and improve weld toughness, meeting EN10219 mechanical property requirements.
Stress-Relieved Heat Treatment: Perform stress-relieved heat treatment on the welded pipe to eliminate residual stress, improve the anti-fatigue performance and stress corrosion resistance of the pipe body, and avoid cracking during pipeline installation and service.
NDT Inspection: 100% online ultrasonic testing (UT) of weld seams to detect internal defects; X-ray testing (RT) optional for high-safety projects (such as offshore pipelines); visual inspection of weld surface to ensure no pores, cracks, or incomplete fusion.
Hydrostatic Test: 100% pressure test is carried out at ≥1.5 times the working pressure, with a holding time of 30-60 minutes according to EN10219 standard, ensuring no leakage or permanent deformation-critical for the safety and reliability of industrial pipelines.
Anti-Corrosion Treatment (Optional): For buried, offshore, or chemical medium transmission pipelines, apply 3PE/FBE anti-corrosion coating (external) and epoxy resin coating (internal) to isolate corrosive media, extend the pipeline service life, and meet the anti-corrosion requirements of industrial projects.
Finishing: Cut the pipes to standard lengths, process pipe ends (beveled/plain/flanged), apply anti-rust oil to the surface, and carry out clear marking to complete the production process.
Product Advantages
EN10219 Standard Compliance: Fully meets the European standard for cold-formed welded steel pipes for pressure purposes, accepted by European engineering owners, industrial enterprises, and third-party inspectors, ensuring smooth project acceptance in global markets.
S355 High-Strength Performance: Minimum yield strength ≥355MPa, excellent toughness and weldability, suitable for medium-pressure transmission and complex environmental service; multiple quality grades (JR/J0/J2/N/NL) meet diverse project temperature and toughness requirements[1].
Advanced HFW Welding Technology: Higher precision and more stable weld quality than ordinary ERW pipes, weld mechanical properties consistent with base metal, suitable for DN400 large-diameter industrial and municipal pipelines.
DN400 Standard Industrial Specification: Widely recognized for industrial fluid transmission and municipal engineering, high flow efficiency, compatible with European standard fittings (flanges, valves), reducing construction cost.
Superior Corrosion Resistance: Low-sulfur low-phosphorus composition + professional anti-corrosion coatings, resisting corrosion from atmospheric, soil, seawater, and industrial media, adapting to harsh industrial and offshore environments.
High Precision & Easy Installation: Strict dimensional tolerance control ensures perfect connection with pipeline fittings, reducing on-site construction time and cost; 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 EN10219 standard requirements.
Complete Quality Traceability: Full heat number tracking, EN10219 standard Mill Test Report (MTR) provided for each order; SGS/BV/DNV third-party inspection available to meet the strict quality requirements of industrial and offshore projects.
Main Applications
Municipal water supply, drainage, and sewage treatment pipelines
Industrial fluid (oil, gas, chemical reagents, steam) transmission pipelines
Offshore platform auxiliary pipelines and coastal engineering pipelines
Construction engineering supporting pipelines (fire protection, HVAC, water supply)
Medium-pressure natural gas and LPG transmission pipelines
Industrial process pipelines in refineries, chemical plants, and power stations
Low-temperature environment pipelines (S355NL grade, down to -50℃)[1]
Structural support pipelines in bridges and industrial buildings
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness, and out-of-roundness to meet EN10219 standards, ensuring compatibility with pipeline fittings and on-site installation requirements.
Mechanical Property Testing: Tensile test, bend test, flattening test, hydrostatic test, and mandatory Charpy impact test (different temperatures based on grade); optional Z25 anti-laminar tearing test for offshore and structural projects[1].
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams; X-ray Testing (RT) and TOFD detection optional for high-safety projects; visual inspection of pipe body and weld surface.
Chemical Analysis: Heat-batch chemical composition analysis per EN10219, strict control of harmful elements and non-metallic inclusions, ensuring the corrosion resistance and mechanical properties of the pipe[1].
Certification: EN10219 standard Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV, DNV) available on request to meet global industrial project acceptance standards.
Packaging & Delivery
Packaging: Pipes are bundled with heavy-duty steel strips (6-10 strips per bundle), wrapped with waterproof and oil-proof woven cloth to prevent rust, oil pollution, and damage during transportation and on-site storage; high-strength plastic or steel end caps are installed to protect pipe ends and internal surfaces, avoiding dust and moisture contamination (critical for fluid transmission cleanliness).
Marking: Each pipe is clearly marked with EN10219, HFW, S355 grade, DN400, OD 406.4×WT, heat number, batch number, length, manufacturing date, and "Industrial Steel Pipe" identification, facilitating on-site identification and management, complying with the marking requirements of EN10219.
Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for global industrial and municipal projects.
Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for large-diameter steel pipes, ensuring efficient and convenient global transportation, supporting timely delivery for project schedules.
Customization: Accept customized wall thickness (6mm-22mm), anti-corrosion coating (3PE/FBE/epoxy resin), lengths (matching industrial project construction design), and pipe ends (beveled/plain/flanged) to meet specific pipeline project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized technical solutions of EN10219 S355 HFW Steel Pipe DN400, please contact our sales team. We have rich experience in supporting European and global industrial, municipal, and offshore projects, providing EN10219 compliant S355 HFW steel pipes, and professional technical support for on-site installation, pressure testing, and anti-corrosion treatment, ensuring the safe, stable, and efficient operation of your pipeline systems.
About us
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
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.
Certifications
API 2B
API 5L
GOST
ISO 9001
EN 10219
EN 10210
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