Hastelloy C276/C22 (UNS N10276/N06022) form the ultimate corrosion-resistant alloy package for marine & offshore industry, covering 99% of the most severe corrosion scenarios. C276 excels in reducing environments with high chloride and sulfide content, while C22 delivers superior performance in oxidizing and mixed-acid conditions, making them the only reliable solution for chemical tankers, FPSOs and deep-sea subsea systems.
With PREN values of ≥69 (C276) and ≥65 (C22), the highest among all standard offshore alloys, they provide unmatched resistance to pitting, crevice corrosion and stress corrosion cracking. Emily PIPE supplies classification society-certified Hastelloy C276/C22 seamless pipes, clad pipes, bars and forgings manufactured via double vacuum melting (VIM+VAR) that fully comply with NACE MR0175/ISO 15156 and API standards.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B622/B619 (C276), ASTM B622/B619 (C22), ASTM B574 (Bar/Rod)
2. Offshore Standards: NACE MR0175/ISO 15156-3, API 5LC, API 6A 3. Marine Standards: ABS, DNV, LR, BV, CCS, RINA 4. Pressure Vessel Standards: ASME Section VIII Div.1 5. Testing Standards: ASTM E8, ASTM G48 (Pitting/Crevice), ASTM E243 (Eddy Current) |
| Material Grade | 1. Hastelloy C276 (UNS N10276): W.Nr.2.4819, NiMo16Cr15W
2. Hastelloy C22 (UNS N06022): W.Nr.2.4602, NiCr21Mo14W 3. Premium Subsea Grade: VIM+VAR double vacuum melted, low residual elements 4. Clad Grade: C276/C22 weld overlay on carbon steel for large-diameter piping |
| Chemical Composition (Weight %) | C276: Ni≥57, Cr14.5-16.5, Mo15.0-17.0, W3.0-4.5, Fe4.0-7.0, C≤0.010
C22: Ni≥56, Cr20.0-22.5, Mo12.5-14.5, W2.5-3.5, Fe2.0-6.0, C≤0.015 Note: Higher Mo/W in C276 improves reducing acid resistance; higher Cr in C22 enhances oxidizing/mixed acid performance |
| Mechanical Properties (Solution Annealed) | C276: Tensile 690-900MPa, Yield≥310MPa, Elongation≥40%, HB180-230
C22: Tensile 690-930MPa, Yield≥310MPa, Elongation≥40%, HB180-235 Impact Toughness (-196℃): Both ≥120 J Max Service Temp: 650℃ continuous |
| Dimensional Tolerance | 1. Seamless Pipes/Tubes: Ø6-50mm ±0.15mm; Ø50-150mm ±0.3mm; Wall±0.08-0.12mm
2. Clad Pipes: Ø100-1200mm ±1.0mm; Cladding thickness 3-10mm ±0.5mm 3. Bars/Rods: Ø6-50mm ±0.3mm; Ø50-300mm ±0.6mm; Straightness ≤0.3mm/m 4. Forgings: Custom dimensions per drawing, tolerance ±0.5mm 5. Length Tolerance: ±2mm (1-12m); custom lengths up to 18m available |
| Why This Material Is Used in Marine & Offshore Industry | 1. Unmatched Chemical Tanker Performance:
– The only alloys approved for transporting 95%+ of hazardous chemicals including HCl, HF, H₂SO₄, Cl₂ and chlorinated solvents – C276: Corrosion rate <0.001mm/year in boiling 10% HCl vs. >10mm/year for 316L – C22: Superior resistance to oxidizing acids and mixed chemical cargoes – Eliminates cargo contamination risks and reduces dry dock inspection frequency by 70% 2. Extreme Sour Service Capability: – NACE MR0175 certified for H₂S partial pressures up to 100 psi – Resists sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC) – Ideal for ultra-deep HPHT fields with H₂S concentrations exceeding 100,000 ppm – Outperforms Inconel 625 by 2x in severe sour environments 3. Superior Deep-Sea Exploration Durability: – Withstands hydrostatic pressure at depths up to 11,000 meters (Mariana Trench level) – Non-magnetic properties make them ideal for ROV navigation and sonar equipment – Excellent erosion resistance to sediment-laden deep-sea water – Used in subsea sampling systems and scientific research equipment 4. Offshore Wind Farm Corrosion Solution: – Resists splash zone corrosion and salt spray for 30+ years without maintenance – Excellent resistance to galvanic corrosion when coupled with carbon steel – Ideal for foundation fasteners, transformer components and subsea cable systems – Eliminates the need for protective coatings and annual inspections 5. Superior Field Fabricability: – Excellent weldability with all conventional welding processes – No post-weld heat treatment required, critical for remote offshore installations – Reduces installation time and costs by 40-50% compared to other high-performance alloys |
| Application Scenarios and Corresponding Customers | 1. FPSOs and FLNGs:
– Applications: Acid gas removal systems, produced water handling, sour crude processing, heat exchangers, flare stacks – Customers: ExxonMobil, Shell, BP, Chevron, TotalEnergies, CNOOC 2. Chemical and Product Tankers: – Applications: Cargo tank liners, cargo piping, pump and valve components, heat exchangers, vent systems – Customers: Stolt-Nielsen, Odfjell, Navig8, Maersk Tankers, Sinochem Shipping 3. Subsea Production Systems: – Applications: Sour service flowlines, umbilicals, manifolds, Christmas trees, jumpers, connectors – Customers: TechnipFMC, Schlumberger, Halliburton, Baker Hughes, Aker Solutions 4. Offshore Wind Farms: – Applications: Foundation fasteners, turbine internals, transformer cooling systems, subsea cables, corrosion-resistant cladding – Customers: Ørsted, Vestas, Siemens Gamesa, Goldwind, Envision Energy 5. Deep-Sea Exploration Vessels: – Applications: ROV/AUV pressure hulls, sampling systems, subsea instrumentation, hydraulic systems – Customers: Woods Hole Oceanographic Institution, China Ocean Mineral Resources R&D Association |
| Customer Requirements in This Industry | 1. Performance Requirements:
– Mixed Acid Resistance: Must withstand simultaneous attack of multiple corrosive chemicals – Extreme Sour Service Resistance: Must meet NACE MR0175 requirements for high H₂S concentrations – Deep-Sea Pressure Resistance: Must withstand hydrostatic pressure at depths up to 6000 meters – Erosion-Corrosion Resistance: Must withstand high-velocity fluid and sediment impingement – Non-Magnetic Properties: Must meet strict magnetic permeability standards for subsea instrumentation 2. Quality and Compliance Requirements: – NACE and API Certification: Must provide NACE MR0175 and API 5LC certification – Classification Society Approval: Must be approved by ABS, DNV, LR or equivalent – Full Traceability: Must provide complete traceability from raw material to finished product – Third-Party Inspection: Must allow inspection by independent offshore inspectors – Material Certification: Must provide EN 10204 3.2 mill test reports 3. Manufacturing Requirements: – Double Vacuum Melting: Must use VIM+VAR process for critical subsea components – Cladding Technology: Must provide high-quality weld overlay cladding for large-diameter pipes – Precision Dimensional Tolerances: Must meet tight tolerances for proper fit and assembly – Non-Destructive Testing: Must undergo 100% UT, ET and hydrostatic testing – Customization: Must produce custom sizes and shapes per customer drawings |
| Common Related Products in This Industry | 1. Hastelloy C276/C22 Seamless Pipes/Tubes: For subsea umbilicals, hydraulic lines and heat exchangers
2. Hastelloy C276/C22 Welded Pipes: Cost-effective for large-diameter process and cargo piping 3. Hastelloy C276/C22 Clad Pipes: Carbon steel base with C276/C22 liner for flowlines and risers 4. Hastelloy C276/C22 Bars/Rods: For valve stems, pump shafts, impellers and fasteners 5. Hastelloy C276/C22 Forgings: Custom forgings including flanges, valve bodies, pump casings and manifolds 6. Hastelloy C276/C22 Fasteners: Bolts, nuts, screws, studs and washers for severe corrosion service 7. Hastelloy C276/C22 Welding Materials: ERNiCrMo-4 (C276) and ERNiCrMo-10 (C22) electrodes/wires 8. Hastelloy C276/C22 Sheets and Plates: For tank liners, splash zone cladding and structural components 9. Hastelloy C276/C22 U-Bend Tubes: Custom bent tubes for offshore heat exchangers and condensers 10. Custom Fabricated Assemblies: Pre-fabricated piping spools and subsea manifolds |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Offshore Alloy Expertise: We have supplied Hastelloy products to over 250 offshore projects worldwide
2. Full NACE, API and Classification Society Certification: Our production line meets the strictest offshore industry standards 3. Advanced Cladding Technology: We offer high-quality Hastelloy C276/C22 weld overlay cladding for large-diameter pipes 4. Full-Process Quality Control: We implement 100% ultrasonic, eddy current and hydrostatic testing on all products 5. Strategic Inventory Management: We maintain 250+ tons of Hastelloy C276/C22 inventory to support urgent offshore requirements 6. Global Logistics Network: We have experience delivering to remote offshore locations worldwide 7. Dedicated Offshore Technical Team: Our metallurgical engineers specialize in offshore material selection and failure analysis 8. One-Stop Solution: We provide complete solutions from raw material supply to finished machined components |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full MTR including chemical analysis, mechanical properties, NDT results and corrosion test reports. SSC and HIC test reports available upon request
2. Full Material Traceability: Every product has a unique heat number and complete traceability documentation from ingot to finished product 3. Value-Added Processing: We offer precision cutting, CNC bending, welding, end processing and surface finishing services 4. Emergency Response Service: We provide 24/7 emergency support for offshore shutdown requirements 5. Market Growth: The global Hastelloy market for marine & offshore industry is projected to grow at a CAGR of over 9% through 2030, driven by chemical tanker fleet expansion and offshore wind farm construction 6. Sustainability Commitment: All our products are manufactured using sustainable practices and are 100% recyclable |
| Packaging | 1. Plastic Caps: All pipe/bar ends are protected with heavy-duty polyethylene caps with internal sealing rings to prevent contamination
2. Waterproof Film: Each product is individually wrapped in waterproof and anti-corrosion film 3. Bundle Packing: Products of the same size are bundled with steel straps and wooden spacers to prevent contact damage 4. Wooden Case: Bundles are packed in sturdy fumigated wooden cases with steel reinforcement for international shipping 5. Export Standard Packing: All packaging complies with international export standards and ISPM 15 regulations 6. Marking: Each package is clearly marked with product specifications, heat number, batch number, quantity and destination |
Looking for Hastelloy C276/C22 pipe, bar or forging for marine & offshore applications? Send us your dimensions, application requirements and certification standards. We will provide a customized quotation and technical data sheet within 12 hours.