As the most widely specified alloy for offshore seawater systems and moderate sour service, Alloy 825 features titanium stabilization that eliminates intergranular corrosion after welding, requiring no post-weld heat treatment. Emily PIPE supplies classification society-certified Alloy 825 seamless pipes, welded pipes, bars and forgings fully compliant with NACE MR0175/ISO 15156 and API standards.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B423 (Seamless Pipe), ASTM B705 (Welded Pipe), ASTM B425 (Bar/Rod), ASTM B564 (Forgings)
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. Standard Offshore Grade: Alloy 825 (UNS N08825), solution annealed
2. NACE Certified Grade: Hardness ≤22 HRC for sour service applications 3. Welding Grade: Low carbon content for improved weldability 4. Equivalent Grades: NS1402 (China), Incoloy 825 (USA), Nicrofer 4221 (Germany) |
| Chemical Composition (Weight %) | 1. Nickel (Ni): 38.0-46.0 (base element for SCC resistance)
2. Chromium (Cr): 19.5-23.5 (oxidizing acid resistance) 3. Molybdenum (Mo): 2.5-3.5 (reducing acid and pitting resistance) 4. Copper (Cu): 1.5-3.0 (key element for sulfuric acid resistance) 5. Titanium (Ti): 0.6-1.2 (stabilizes against intergranular corrosion) 6. Iron (Fe): ≥22.0 (improves formability and reduces cost) 7. Carbon (C): ≤0.05, Manganese (Mn): ≤1.00, Sulfur (S): ≤0.030 |
| Mechanical Properties (Annealed State) | 1. Tensile Strength (RT): 585-795 MPa
2. 0.2% Yield Strength (RT): ≥240 MPa 3. Elongation (δ5): ≥30% 4. Hardness (HB): 130-200 5. Tensile Strength (400℃): ≥400 MPa 6. Maximum Continuous Service Temperature: 425℃ |
| Dimensional Tolerance | 1. Seamless Pipes/Tubes: Ø6-50mm ±0.15mm; Ø50-150mm ±0.3mm; Wall thickness ±0.08-0.12mm
2. Welded Pipes: Ø10-600mm ±0.2mm; Wall thickness ±0.10mm 3. Bars/Rods: Ø6-50mm ±0.3mm; Ø50-300mm ±0.6mm; Straightness ≤0.3mm/m 4. U-Bend Tubes: Bend radius ±0.5mm; Ovality at bend ≤3% of OD 5. Length Tolerance: ±2mm (1-12m); custom lengths up to 18m available |
| Why This Material Is Used in Marine & Offshore Industry | 1. Unmatched Cost-Effectiveness:
– 40-50% lower material cost than Hastelloy C276 and Inconel 625 – 5-10 times longer service life than 316L stainless steel in aggressive environments – Reduces total cost of ownership by 60-70% compared to stainless steel 2. Superior Chloride SCC Resistance: – 38-46% nickel content provides excellent immunity to chloride-induced stress corrosion cracking – Resists cracking in seawater and brine solutions up to 30,000 ppm Cl⁻ – Eliminates the most common failure mode in marine piping systems 3. Excellent Acid Resistance: – Specifically formulated for 20-40% boiling sulfuric acid, the most corrosive range for stainless steels – Good resistance to phosphoric acid, nitric acid and organic acids – Ideal for acid gas removal systems and produced water handling 4. Proven Sour Service Performance: – NACE MR0175 certified for H₂S partial pressures up to 200 psi at 175℃ – Resists sulfide stress cracking (SSC) in moderate sour environments – Suitable for offshore oil and gas production with medium sulfur content 5. Superior Field Fabricability: – Titanium stabilization eliminates carbide precipitation in weld heat-affected zones – No post-weld heat treatment required, critical for remote offshore installations – Excellent weldability with all conventional welding processes |
| Application Scenarios and Corresponding Customers | 1. FPSOs and FLNGs:
– Applications: Seawater cooling systems, produced water handling, acid gas removal units, heat exchangers, process piping – Customers: ExxonMobil, Shell, BP, Chevron, TotalEnergies, CNOOC 2. Offshore Oil and Gas Production: – Applications: Wellhead components, Christmas trees, flowlines, manifolds, umbilicals, valve bodies – Customers: TechnipFMC, Schlumberger, Halliburton, Baker Hughes, Aker Solutions 3. Offshore Wind Farms: – Applications: Foundation fasteners, turbine internals, transformer cooling systems, subsea cables, corrosion-resistant cladding – Customers: Ørsted, Vestas, Siemens Gamesa, Goldwind, Envision Energy 4. Chemical and Product Tankers: – Applications: Cargo tank piping, heat exchangers, pump and valve components, vent systems – Customers: Stolt-Nielsen, Odfjell, Navig8, Maersk Tankers, Sinochem Shipping 5. Seawater Desalination Plants: – Applications: Brine processing lines, heat exchanger tubes, high-pressure pumps, reverse osmosis systems – Customers: DuPont Water Solutions, Veolia, SUEZ, Acciona Agua |
| Customer Requirements in This Industry | 1. Performance Requirements:
– Chloride SCC Resistance: Must be immune to stress corrosion cracking in seawater – Sour Service Resistance: Must meet NACE MR0175 requirements for H₂S – Acid Resistance: Must withstand sulfuric acid and produced water environments – Fatigue Resistance: Must withstand cyclic loads from wave action and vibration – Weldability: Must be easily weldable without post-weld heat treatment 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: – Precision Dimensional Tolerances: Must meet tight tolerances for proper fit and assembly – Surface Quality: Must have smooth surfaces to reduce flow resistance and corrosion initiation – Internal Quality: Must be free from inclusions, porosity and segregation (100% UT/ET verified) – Consistent Quality: Must have uniform chemical composition across all batches – Customization: Must produce custom sizes and shapes per customer drawings |
| Common Related Products in This Industry | 1. Alloy 825 Seamless Pipes/Tubes: For seawater cooling, hydraulic lines and heat exchangers
2. Alloy 825 Welded Pipes: Cost-effective for large-diameter process and seawater piping 3. Alloy 825 U-Bend Tubes: Custom bent tubes for offshore heat exchangers and condensers 4. Alloy 825 Bars/Rods: For valve stems, pump shafts, fasteners and machined components 5. Alloy 825 Forgings: Custom forgings including flanges, valve bodies, pump casings and manifolds 6. Alloy 825 Fasteners: Bolts, nuts, screws, studs and washers for offshore applications 7. Alloy 825 Welding Materials: ERNiFeCr-1 electrodes and wires for offshore welding 8. Alloy 825 Sheets and Plates: For tank liners, splash zone cladding and structural components 9. Alloy 825 Machined Components: Precision-machined valves, fittings and pump parts 10. Custom Fabricated Assemblies: Pre-fabricated piping spools and heat exchanger bundles |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Offshore Alloy Expertise: We have supplied Alloy 825 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. Full-Process Quality Control: We implement 100% ultrasonic, eddy current and hydrostatic testing on all products 4. Complete International Certifications: Our products hold ASTM, ASME, PED, NACE and marine certifications 5. Advanced Customization Capability: We can produce custom sizes, lengths and shapes per your drawings 6. Strategic Inventory Management: We maintain 300+ tons of Alloy 825 inventory to support urgent offshore requirements 7. Global Logistics Network: We have experience delivering to remote offshore locations worldwide 8. One-Stop Solution: We provide complete solutions from raw material supply to pre-fabricated assemblies |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full MTR including chemical analysis, mechanical properties and NDT results. 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 Alloy 825 market for marine & offshore industry is projected to grow at a CAGR of over 6% through 2030, driven by offshore wind farm construction and deep-water oil & gas development 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 Alloy 825 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.