Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of lsaw en10219 carbon steel pipe for geothermal heating network 610mm in China. Welcome to buy discount lsaw en10219 carbon steel pipe for geothermal heating network 610mm made in China here from our factory. Quality products and low price are available.
Product introduction
Product Description
LSAW EN10219 Carbon Steel Pipe For Geothermal Heating Network 610mm is a heavy-duty longitudinal submerged-arc welded steel pipe specially developed for geothermal heating, ground-source heat pump systems, urban geothermal heating network trunk pipelines and underground heat-carrying medium transmission. Manufactured strictly in accordance with EN 10219-1 (Cold-formed welded structural steel hollow sections for construction and engineering purposes) and CE certification standards, it adopts high-quality S275JR / S355JR structural carbon steel plates and advanced double-sided submerged-arc welding (LSAW) technology. With outer diameter fixed at 610 mm, the pipe features excellent low-temperature toughness, good thermal-cycle stability, high pressure resistance, outstanding underground corrosion resistance and stable weld quality. It is perfectly suitable for long-term buried service of geothermal hot water and heat-transfer fluid pipelines, widely used in district geothermal heating projects, industrial park geothermal energy systems and municipal heating network reconstruction, providing safe, long-life and reliable pipeline solutions for European and global geothermal heating infrastructure.
Basic Product Specifications
Product Name: LSAW EN10219 Carbon Steel Pipe For Geothermal Heating Network 610mm
Executive Standard: EN 10219-1, CE certified, compatible with ISO 3183 & GB/T 9711
Manufacturing Process: LSAW (Longitudinal Submerged Arc Welding), single-plate cold forming, double-sided SAW welding, cold expansion, weld normalization, stress-relieved heat treatment (standard for geothermal service)
Steel Grade: S275JR, S355JR (core grades for geothermal heating per EN10219-1), optional custom grades for special geothermal conditions
Outer Diameter (OD): 610 mm (fixed, mainstream specification for geothermal heating trunk lines)
Wall Thickness (WT): 8 mm – 30 mm, custom thick-wall up to 36 mm for high-pressure deep geothermal well transmission
Standard Length: 12 m (standard), 6 m optional, custom fixed lengths available (matching geothermal construction needs)
Delivery Condition: Normalized + stress-relieved (standard, for thermal-cycle fatigue resistance); hot-rolled available for conventional geothermal projects
Surface Finish: Black bare steel with anti-rust oil; 3PE, FBE, bitumen anti-corrosion coating (standard for buried geothermal pipelines, resisting underground moisture and soil corrosion)
Pipe End: 30°/45° beveled ends for field welding (standard for geothermal pipeline connection); plain ends, flanged ends optional
Application: Urban geothermal heating network trunk lines, ground-source heat pump main pipelines, deep geothermal well heat-medium delivery pipes, industrial park geothermal heating systems, municipal heating network expansion & reconstruction, underground buried hot water circulation pipelines, cold-region geothermal heating projects
Grade & Process Explanation
EN10219 Steel Grade for Geothermal Service: S275JR and S355JR are core structural steel grades under EN10219-1, specially selected for geothermal heating scenarios. S275JR features minimum yield strength ≥275 MPa, good weldability and thermal-cycle stability, suitable for conventional low-to-medium pressure geothermal heating systems. S355JR (yield strength ≥355 MPa) offers higher strength and better low-temperature impact resistance, ideal for high-pressure deep geothermal wells and cold-region heating networks. Both grades adopt low-sulfur (≤0.030%) and low-phosphorus (≤0.030%) composition, effectively resisting corrosion from geothermal hot water, underground brine and acidic soil media, avoiding scaling and stress corrosion under long-term high-temperature operation.
LSAW Process Advantages for Geothermal Heating: Adopting single steel plate cold forming + double-sided full-penetration submerged-arc welding, avoiding longitudinal splicing defects and ensuring that the mechanical properties of the weld seam are consistent with the base metal. The post-weld normalization + stress-relieved heat treatment eliminates internal residual stress, improves the pipe's fatigue resistance under long-term hot-cold thermal cycles (a key requirement for geothermal pipelines), and effectively prevents weld cracking caused by repeated temperature changes. The cold expansion process optimizes the roundness and wall thickness uniformity of the 610mm pipe, ensuring stable pressure-bearing performance and convenient on-site installation.
Geothermal-Oriented Special Design: Optimized for buried underground geothermal environments, focusing on thermal-cycle stability and corrosion resistance. The 610mm large-bore design matches the mainstream flow demand of geothermal heating trunk lines, reducing heat-medium flow resistance and improving heat transmission efficiency. Strict dimensional tolerance control ensures reliable connection with geothermal valves, heat exchangers and pipeline fittings. The optional multi-layer anti-corrosion coating (3PE/FBE) is specially designed for underground damp, saline and acidic soil conditions, effectively isolating soil corrosion and extending the service life of the pipeline to over 30 years.
Dimensional Tolerance (EN10219-1 Standard)
|
Item |
Tolerance (610mm OD) |
|
Outer Diameter |
±1.0% of nominal OD (610mm), max ±6.1mm |
|
Wall Thickness |
+15% / −12.5% of nominal WT, min allowable WT ≥ 80% of nominal WT |
|
Out-of-Roundness |
≤1.2% of outer diameter (≤7.32mm for 610mm OD) |
|
Straightness |
≤2.5 mm per meter, ≤30 mm for 12 m length |
|
Length |
+300 mm / −0 mm, custom ±50 mm available |
Mechanical Properties (EN10219-1 Reference)
|
Property |
S275JR |
S355JR |
|
Minimum Yield Strength |
≥275 MPa |
≥355 MPa |
|
Tensile Strength |
410–560 MPa |
470–630 MPa |
|
Elongation |
≥23% |
≥21% |
|
Hydrostatic Test |
100% tested at 1.5× working pressure, holding time ≥30 minutes, no leakage or permanent deformation |
|
|
Charpy Impact (V-notch) |
≥27 J at 0℃ (mandatory for geothermal heating service); ≥20 J at -20℃ optional for cold regions |
|
|
Flattening / Bend Test |
No cracks, weld separation or defects after testing, complying with EN10219-1 requirements |
|
Note: Stress-relieved heat treatment is standard for all geothermal-grade pipes to enhance low-temperature toughness and anti-thermal-fatigue performance, preventing pipeline damage caused by repeated hot-cold cycles of geothermal hot water.
Chemical Composition (Max. %, EN10219-1)
|
Element |
C |
Mn |
P |
S |
Si |
|
S275JR |
≤0.21 |
≤1.50 |
≤0.030 |
≤0.030 |
≤0.55 |
|
S355JR |
≤0.24 |
≤1.60 |
≤0.030 |
≤0.030 |
≤0.55 |
Residual elements: Cu ≤0.55%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.08% (max. %). Strict control of impurities and non-metallic inclusions prevents hot-water-induced stress corrosion, scaling and weld defects, ensuring the pipe's long-term stable operation in geothermal heating systems. LF furnace refining with calcium treatment is adopted to further improve weld quality and corrosion resistance, adapting to the harsh underground geothermal environment.
Manufacturing Process (LSAW for Geothermal Heating Pipes)
Raw Material Inspection: Select high-quality S275JR/S355JR steel plates that comply with EN10219-1 standard, and strictly inspect the chemical composition and mechanical properties before production. The steel plates undergo pickling, derusting and oil removal to eliminate surface impurities, ensuring weld quality and avoiding contamination of geothermal heat medium.
Plate Forming: The steel plates are cold-formed into a cylindrical shape through intelligent forming rolls, with precise dimensional control to ensure uniform wall thickness and high roundness (out-of-roundness ≤7.32mm for 610mm OD), meeting the requirements of EN10219-1 standard and laying a foundation for subsequent welding and pipeline connection.
Double-sided LSAW Welding: Double-sided submerged-arc welding is used to achieve full-penetration longitudinal welding. The weld seam undergoes normalization heat treatment (850-900℃) to eliminate internal stress, ensuring that the mechanical properties of the weld seam are consistent with the base metal, which is critical for preventing leakage in geothermal heat medium transmission. Weld seam 100% online ultrasonic testing (UT) is performed to eliminate welding defects such as cracks and incomplete fusion.
Cold Expansion: The formed and welded 610mm pipe undergoes cold expansion treatment to improve roundness, reduce residual stress, and enhance the uniformity of wall thickness. This process greatly improves the long-term pressure-bearing reliability and thermal-cycle stability of the pipe, adapting to the load of buried installation and long-term hot-cold cycle operation.
NDT Inspection: 100% Ultrasonic Testing (UT) of weld seams and pipe body; Radiographic Testing (RT) is optional for high-safety geothermal trunk-line projects, fully complying with the non-destructive testing requirements of EN10219-1.
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 EN10219-1 standard, ensuring no leakage or permanent deformation, which is critical for the safety of geothermal heating pipelines.
Stress-Relieved Heat Treatment: As a standard process for geothermal pipes, stress-relieved heat treatment (600-650℃) is performed to eliminate residual stress, improve thermal-cycle fatigue resistance, and prevent weld cracking caused by repeated temperature changes of geothermal heat medium.
Finishing: Internal and external anti-rust oil coating is applied to prevent corrosion during storage and transportation; 3PE/FBE/bitumen anti-corrosion coating is applied as standard for buried geothermal service. Pipe ends are beveled (30°/45°) for field welding, and clear marking is carried out to complete the production process.
Product Advantages
Strict EN10219-1 Compliance & CE Certification: Fully manufactured in accordance with EN10219-1 standard, CE certified, meeting European geothermal engineering acceptance requirements, suitable for EU and global geothermal heating projects.
610mm Fixed OD for Geothermal Trunk Lines: Matches the mainstream specification of urban geothermal heating network trunk lines, large-bore design ensures high heat-medium flow efficiency, reducing energy loss during transmission.
Excellent Thermal-Cycle Fatigue Resistance: Standard stress-relieved heat treatment + LSAW weld normalization, effectively resisting repeated hot-cold cycles of geothermal hot water, avoiding pipeline cracking and leakage, ensuring long-term stable operation.
Strong Buried Corrosion Resistance: Standard 3PE/FBE anti-corrosion coating + low-sulfur low-phosphorus steel composition, adapting to underground damp, saline and acidic soil environments, extending service life to over 30 years.
Stable LSAW Weld Quality: Double-sided full-penetration submerged-arc welding, weld mechanical properties consistent with the base metal, low defect rate, high structural stability, adapting to long-term buried pressure and thermal stress.
Precise Dimensional Accuracy: Strict tolerance control in accordance with EN10219-1, ensuring seamless connection with geothermal valves, heat exchangers and other components, reducing on-site installation errors and improving construction efficiency.
Complete Quality Traceability: Complete heat number and batch records, Mill Test Report (MTR) provided for each order; third-party inspection (SGS, BV) available, ensuring quality traceability and project safety.
Customizable for Geothermal Scenarios: Accept custom wall thickness (up to 36mm), anti-corrosion coating type, and pipe length, adapting to different geothermal conditions (deep well, cold region, industrial park).
Main Applications
Urban municipal geothermal heating network trunk pipelines (610mm mainstream specification)
Ground-source heat pump large-scale heat-medium circulation pipelines
Deep geothermal well hot-water extraction and delivery pipelines
Industrial park and community geothermal heating system main pipes
Cold-region geothermal heating buried pipeline projects (with low-temperature impact resistance)
European district heating & geothermal energy infrastructure projects
Geothermal heating network expansion and reconstruction projects
Underground buried hot water circulation pipelines for commercial and residential districts
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter (610mm), wall thickness, length, straightness and out-of-roundness to meet EN10219-1 standard, ensuring compatibility with geothermal pipeline components.
Mechanical Property Testing: Tensile test, flattening test, bend test, hydrostatic test, and Charpy V-notch impact test (mandatory for geothermal service) to verify product mechanical performance and pressure-bearing capacity, in line with EN10219-1 technical requirements.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams and pipe body; Radiographic Testing (RT) optional for high-safety geothermal projects; Eddy Current Testing (ECT) for surface defect inspection, complying with the NDT specifications of EN10219-1.
Chemical Analysis: Heat analysis to confirm chemical composition meets EN10219-1 S275JR/S355JR grade requirements, strict control of harmful elements and non-metallic inclusions, ensuring product quality and corrosion resistance.
Certification: EN10219-1 & CE certification, Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV) available on request to meet global geothermal project acceptance standards.
Packaging & Delivery
Packaging: 610mm pipes are bundled with heavy-duty steel strips (8-12 strips per bundle), wrapped with waterproof and dust-proof woven cloth to prevent rust 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 geothermal heat medium purity).
Marking: Each pipe is clearly marked with EN10219-1, CE, LSAW, 610mm, steel grade, size (OD×WT), heat number, batch number, length, manufacturing date, and "Geothermal Heating Pipe" identification, facilitating on-site identification and management, complying with the marking requirements of EN10219-1.
Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for EU and global geothermal heating projects.
Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for 610mm large-diameter pipes, ensuring efficient and convenient global transportation, supporting timely delivery for geothermal project schedules.
Customization: Accept customized wall thickness (8mm-36mm), anti-corrosion coating (3PE/FBE/bitumen), lengths (matching geothermal construction design), and pipe ends (custom bevel angles/flanged ends) to meet specific EN10219 geothermal heating pipeline project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized solutions of LSAW EN10219 Carbon Steel Pipe For Geothermal Heating Network 610mm, please contact our sales team. We have rich experience in supporting EU and global geothermal heating projects, providing EN10219-compliant 610mm LSAW carbon steel pipes, and professional technical support for on-site installation, pressure testing, and anti-corrosion treatment, ensuring the safe and stable operation of your geothermal heating network 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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