en 10217-7 1.4404 tube
2. Standard: EN 10217-7, the definitive European standard governing welded stainless steel tubes for pressure purposes
3. Process: Automated continuous straight-seam welding from precision steel plates with advanced weld bead conditioning
4. Size Range: Standard metric outer diameters and specialized wall profiles engineered for corrosive industrial layouts
5. Heat Treatment: Homogeneous post-weld solution tempering above 1040°C followed by forced rapid uniform cooling
6. Surface Finish: Thoroughly acid-pickled and passivated, with inside weld reinforcement leveled to prevent fluid friction
7. Application: Coastal desalination plants, marine platform plumbing, sewage disposal networks, and organic chemical reactors
8. Service Advantage: Support 100% X-ray radiography testing (RT) or eddy current inspection, full PED directive alignment
9. Packaging: Hexagonal ocean bundles bound tightly with high-tensile steel straps and equipped with protective end caps
10. Key Advantage: Exceptional resistance to localized chloride pitting while entirely preventing intergranular decay after field welding
EN 10217-7 1.4404 Tube – Premium Low-Carbon Pressure Piping Solutions for Marine & Chemical Industries
HEBEI ALL TRUST STEEL CO., LTD specializes in manufacturing high-performance en 10217-7 1.4404 tube, engineered to European pressure piping standards with ultra-low carbon molybdenum-enhanced metallurgy. We produce welded stainless steel tubes with an annual production capacity of over 15,000 tons and maximum outer diameters up to 1016 mm, which are subjected to 100% hydraulic testing to ensure leak-proof reliability in corrosive coastal desalination, pharmaceutical processing and aggressive chemical transport systems. This product provides high chloride pitting resistance and full immunity to weld zone sensitisation with full EN 10204 3.1/3.2 Mill Test Certificates and PED 2014/68/EU compliance.
Understanding EN 10217-7 1.4404 Tube
The product is a high-integrity welded stainless steel pressure tube produced to EN 10217-7, the ultimate European standard for welded circular tubes for pressure purposes. Material designation 1.4404 (X2CrNiMo17-12-2) comparable to ASTM 316L, with extra-low carbon content (C < 0.03%) and 2.0-2.5% molybdenum. This specialised composition removes the possibility of intergranular corrosion in heat affected weld zones and offers improved pitting resistance.
This tube is safety-critical, not ornamental tubing. It addresses structural failure during high pressure heat cycling, maintains leak tightness in chloride rich conditions and satisfies the criteria of the stringent Pressure Equipment Directive.
The continuous straight-seam welding process uses automated TIG or laser fusion technology. Post-weld solution annealing above 1040°C followed by forced rapid cooling ensures homogeneous metallurgical structure throughout the weld seam and base metal.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | EN 10217-7 / ASTM A312 / ASTM A249 / EN 10357 |
| Material Grade | 1.4404 (X2CrNiMo17-12-2 / 316L Equivalent) |
| Manufacturing Process | Automatic Longitudinal TIG/Laser Welding |
| Outer Diameter (OD) | 6.0 mm – 1219.2 mm |
| Wall Thickness (WT) | 0.5 mm – 30.0 mm |
| Length | 5.8 m / 6.0 m / 11.8 m / 12.0 m / Custom Cut |
| Surface Finish | Solution Annealed & Pickled (W2A) / Bright Annealed (W2B) / Satin / Mirror Polish |
| Yield Strength (Rp0.2) | ≥ 220 MPa |
| Tensile Strength (Rm) | 500-700 MPa |
| Elongation | ≥ 40% |
| Carbon Content | ≤ 0.03% |
| Molybdenum Content | 2.0-2.5% |
| Operating Temperature | Continuous up to 450°C |
| Non-Destructive Testing | 100% Eddy Current / Hydrostatic / X-Ray RT |
| Mechanical Testing | Transverse Weld Tension / Flattening / Hardness / PMI |
| Corrosion Testing | Intergranular Corrosion Test (EN ISO 3651-2) |
| Certification | EN 10204 3.1 & 3.2 MTC / CE / PED 2014/68/EU |
| Inspection Support | SGS / BV / TÜV / DNV / ABS |
| Packaging | Hexagonal Bundles / Wooden Cases / Protective Caps |
Core Advantages of Our EN 10217-7 1.4404 Tube
Material & Corrosion Excellence
Our product integrates premium low-carbon molybdenum metallurgy. The extra-low carbon profile completely eliminates sensitization risk during multi-pass fabrication. Molybdenum enhancement provides exceptional pitting and crevice corrosion resistance inside coastal pipelines and food-grade process loops. You receive dependable protection against localized chloride attacks that destroy standard austenitic grades.
Manufacturing Quality & Testing Rigor
We process premium heavy steel sheets into precise tolerances using automatic fusion welding technology. Every batch undergoes mandatory post-weld solution annealing at temperatures exceeding 1040°C. Our 100% weld track verification includes eddy current inspection, radiographic testing (RT), and hydrostatic leak testing. Representative production coupons face severe transverse weld tensile testing, guided-bend joint tests, and Positive Material Identification (PMI) alloy validation.
Dimensional Flexibility & Customization
You gain access to versatile dimensional options well-suited for high-risk chemical plant pipelines. We support tailored solution annealed and pickled (W2A) or bright annealed (W2B) surfaces. Custom length increments and waterproof weaving bag bundle wrapping protect your investment during global shipment. Precision-machined threaded ends matching NPT or BSPT taper standards and ANSI butt-weld bevels are readily available.
Strategic Applications
Chemical & Petrochemical Processing
Your heat exchangers and piping systems face continuous exposure to organic and inorganic acids at elevated temperatures. The en 10217-7 1.4404 tube withstands sulfuric and phosphoric acid environments where carbon steel and lower-grade stainless steels fail rapidly. Molybdenum content ensures structural integrity under thermal cycling.
Pharmaceutical & Food Technology
Low carbon 1.4404 material reduces metallic contamination in High Purity Water (WFI) systems and process lines. You satisfy tight hygiene requirements and resist harsh Clean-in-Place (CIP) chemicals. Weld seams are as corrosion resistant as base metal hence no contamination concern in biotech manufacturing.
Marine & Offshore Engineering
Superior chloride resistance is needed for seawater-cooled systems and desalination facilities. Our tubes are very suitable for plumbing of maritime platforms, networks for disposal of coastal sewage and organic chemical reactors. This eliminates the chloride-induced stress corrosion cracking that normally causes failure in the 1.4301 (304) grade equivalents.
FAQ
Q：Why does this low-carbon molybdenum product deliver elite protection inside coastal grids?
A：This tube integrates an extra-low carbon profile control with heavy molybdenum integration, completely eliminating weld zone sensitization during multi-pass fabrication while providing exceptional pitting and crevice corrosion resistance.
Q：Under what operating pressure thresholds is this low-carbon welded pressure tube universally preferred?
A：It is optimized for large-capacity coastal pipelines, food-grade process loops, aggressive acid chemical transport, and volatile petrochemical refinery networks facing continuous localized corrosion cell attacks.
Q：What mechanical deformation testing is contractually performed to ensure the joint structural safety of this batch?
A：Beyond regular eddy current tracking, representative production coupons undergo severe transverse weld tensile testing, guided-bend joint tests, weld seam flattening trials, and precise Positive Material Identification (PMI) alloy validation.
Q：Can the dimensional parameters of this low-carbon metric series be customized with standard end configurations?
A：Yes, we provide precision-machined threaded ends matching NPT or BSPT taper standards, tailored solution annealed and pickled (W2A) or bright annealed (W2B) surfaces, and ANSI butt-weld bevels.
Q：Are your en 10217-7 1.4404 welded tubing lots approved by independent international pressure equipment auditing bodies?
A：Our entire large-diameter line fully adheres to ISO 9001:2015 frameworks, carries CE/PED compliance, and welcomes independent witness inspections from certified third-party bureaus such as SGS, TÜV, and BV.
Contact Us
Get your customized en 10217-7 1.4404 tube solution today. Contact our technical team at info@hballtrust.com for material selection assistance, CAD verification, and comprehensive quotations.
