Inconel 625 (UNS N06625) for electric power industry is a niobium-molybdenum solid-solution strengthened nickel-chromium superalloy, the only commercial alloy that simultaneously delivers exceptional high-temperature strength up to 980℃ and universal corrosion resistance. It solves the most challenging material failures in supercritical boilers, waste-to-energy plants and nuclear reactors where other alloys cannot withstand both extreme heat and aggressive chemistry.
As the industry benchmark for high-temperature corrosion service, Inconel 625 exhibits excellent thermal stability and weldability, requiring no post-weld heat treatment to maintain full corrosion resistance. With over 20 years of production experience, Emily PIPE supplies precision-manufactured Inconel 625 seamless pipes, tubes and bars that meet the strictest international power industry standards, including ASME nuclear codes.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B444 (Seamless Pipe/Tube), ASTM B446 (Bar/Rod), ASME SB444, ASME SB446
2. Nuclear Power Standards: ASME Section III, NQA-1 3. Power Piping Standards: ASME B31.1 (Power Piping), ASME B31.3 4. Pressure Vessel Standards: ASME Section I (Power Boilers), ASME Section VIII Div.1 5. Testing Standards: ASTM E8, ASTM E139 (Creep), ASTM G48 (Pitting/Crevice), ASTM E243 (Eddy Current) |
| Material Grade | 1. Standard Grade: Inconel 625 (UNS N06625) for general power plant service
2. Nuclear Grade: Inconel 625 (Grade 2, solution annealed) for nuclear reactor components 3. Equivalent Grades: NS3306/GH3625 (China), Inconel 625 (USA), W.Nr.2.4856 (Germany) 4. Special Grades: Heavy-wall grade for high-pressure boiler tubes; precision grade for heat exchanger tubes |
| Chemical Composition (Weight %) | 1. Nickel (Ni): 58.0% minimum (base element for corrosion resistance and toughness)
2. Chromium (Cr): 20.0-23.0 (primary element for oxidation and carburization resistance) 3. Molybdenum (Mo): 8.0-10.0 (for reducing acid and pitting resistance) 4. Niobium + Tantalum (Nb+Ta): 3.15-4.15 (solid-solution strengthening, stabilizes against intergranular corrosion) 5. Iron (Fe): ≤5.0 (improves formability and reduces cost) 6. Carbon (C): ≤0.010 (ultra-low content prevents intergranular corrosion) 7. Manganese (Mn): ≤0.50 8. Silicon (Si): ≤0.50 9. Phosphorus (P): ≤0.015 10. Sulfur (S): ≤0.010 |
| Mechanical Properties (Solution Annealed) | 1. Tensile Strength (RT): 760-930 MPa
2. 0.2% Yield Strength (RT): ≥415 MPa 3. Elongation (δ5): ≥45% 4. Reduction of Area: ≥55% 5. Hardness (HB): 180-230 6. Tensile Strength (650℃): ≥520 MPa 7. Creep Rupture Strength (700℃, 10,000h): ≥170 MPa 8. Maximum Continuous Service Temperature: 980℃ (oxidizing environments) |
| Dimensional Tolerance | 1. Seamless Pipes/Tubes: Ø6-50mm ±0.15mm; Ø50-150mm ±0.3mm; Ø150-300mm ±0.5mm; Wall thickness ±0.08-0.12mm
2. Bars/Rods: Ø6-50mm ±0.3mm; Ø50-150mm ±0.5mm; Ø150-300mm ±0.8mm 3. U-Bend Tubes: Bend radius ±0.5mm; Ovality at bend ≤3% of OD 4. Length Tolerance: ±2mm (1-12m); custom lengths up to 18m available |
| Why This Material Is Used in Electric Power Industry | 1. Unmatched Supercritical Boiler Performance:
– The only alloy that can reliably withstand 600-650℃, 25-35MPa supercritical steam with chloride contamination – Resists both creep deformation and high-temperature chloride SCC, the two leading causes of boiler tube failures – Outperforms Alloy 800H by 2x in creep strength at 700℃ and by 10x in chloride corrosion resistance 2. Superior Waste-to-Energy Corrosion Resistance: – Withstands the combined attack of HCl, SO₂, HF and fly ash at temperatures up to 800℃ – Excellent erosion-corrosion resistance to high-velocity flue gases and particulate matter – Eliminates frequent tube failures that cause unplanned plant shutdowns 3. Proven Nuclear Power Reliability: – ASME Section III certified for nuclear reactor internals and auxiliary systems – Excellent resistance to radiation-induced embrittlement and boric acid corrosion – Used in steam generator tube supports, control rod drive mechanisms and radioactive waste handling systems 4. Excellent FGD and Flue Gas Performance: – Resists sulfuric acid dew point corrosion and chloride-induced pitting in flue gas systems – Ideal for FGD spray headers, heat exchangers and stack liners where both corrosion and erosion are present 5. Superior Fabricability and Cost-Effectiveness: – Excellent weldability with no post-weld heat treatment required for most applications – While initial cost is higher than Alloy 800H, 2-3x longer service life reduces total cost of ownership by 40-50% |
| Application Scenarios and Corresponding Customers | 1. Supercritical/Ultra-Supercritical Fossil Power:
– Applications: Final stage superheater tubes, reheater tubes, main steam pipes, header tubes, high-pressure feedwater heaters – Customers: GE Power, Siemens Energy, Mitsubishi Heavy Industries, State Grid Corporation, China Energy Investment Corporation 2. Waste-to-Energy and Biomass Power: – Applications: Boiler superheater tubes, reheater tubes, flue gas piping, heat exchanger tubes, combustion chamber components – Customers: Babcock & Wilcox, Hitachi Zosen, China Everbright Environment, Shanghai Electric 3. Nuclear Power Generation: – Applications: Reactor vessel internals, steam generator tube supports, control rod drive mechanisms, radioactive waste piping – Customers: Westinghouse, Areva, Rosatom, China National Nuclear Corporation, China General Nuclear Power Group 4. Gas Turbine Combined Cycle: – Applications: HRSG high-temperature superheater tubes, exhaust ducts, transition pieces, heat exchanger tubes – Customers: General Electric, Siemens, Mitsubishi Heavy Industries, Ansaldo Energia 5. Flue Gas Desulfurization (FGD): – Applications: Scrubber spray headers, heat exchanger tubes, slurry piping, mist eliminator supports – Customers: DuPont Water Solutions, Veolia, SUEZ, local power generation groups |
| Customer Requirements in This Industry | 1. Performance Requirements:
– High-Temperature Strength: Must maintain sufficient creep resistance at operating temperatures up to 650℃ – Corrosion Resistance: Must resist chloride SCC, pitting and crevice corrosion in high-temperature environments – Erosion-Corrosion Resistance: Must withstand fly ash and slurry impingement – Radiation Resistance: Must withstand neutron radiation in nuclear applications – Thermal Fatigue Resistance: Must withstand cyclic heating and cooling without cracking 2. Quality and Compliance Requirements: – ASME Code Compliance: Must meet all requirements of ASME Section I, Section III and B31.1 – Nuclear Quality Assurance: Must comply with NQA-1 quality assurance requirements for nuclear applications – Full Traceability: Must provide 100% traceability from raw material ore to finished product – Material Certification: Must provide comprehensive MTRs including chemical analysis, mechanical properties and creep test results – Third-Party Inspection: Must allow inspection by TÜV, SGS, BV or other authorized organizations 3. Manufacturing Requirements: – Precision Dimensional Tolerances: Must meet tight tolerances for proper fit and assembly of boiler components – Surface Quality: Must have a smooth, defect-free surface to prevent corrosion initiation – Internal Quality: Must be free from inclusions, porosity and segregation (100% UT/ET verified) – Consistent Quality: Must have uniform chemical composition and grain size across all batches – Heat Treatment Control: Must undergo proper solution annealing to achieve required properties |
| Common Related Products in This Industry | 1. Inconel 625 Seamless Pipes/Tubes: Available in various sizes and wall thicknesses for boiler and heat exchanger applications
2. Inconel 625 U-Bend Tubes: Custom bent tubes for nuclear steam generators and power plant heat exchangers 3. Inconel 625 Bars/Rods: Used for manufacturing fasteners, valve stems, shafts and structural components 4. Inconel 625 Fittings: Elbows, tees, reducers, flanges and couplings for power plant piping systems 5. Inconel 625 Forgings: Custom forgings including valve bodies, pump casings and header components 6. Inconel 625 Fasteners: Bolts, nuts, screws, studs and washers for high-temperature service 7. Inconel 625 Welding Materials: ERNiCrMo-3 electrodes and wires for power plant welding applications 8. Inconel 625 Machined Components: Precision-machined valves, fittings and heat exchanger parts 9. Inconel 625 Sheets and Plates: Used for manufacturing boiler components, tanks and vessels 10. Custom Fabricated Assemblies: Pre-fabricated piping spools and heat exchanger bundles |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Power Industry Alloy Expertise: We have been supplying high-performance Inconel 625 products to the global power industry for over 20 years
2. ASME Nuclear Certified Production Facility: Our production line is fully certified to ASME Section III and NQA-1 standards 3. Full-Process Quality Control: We implement comprehensive quality control including 100% ultrasonic, eddy current and hydrostatic testing 4. Complete International Certifications: Our products meet all major international standards and hold ASTM, ASME, PED and nuclear certifications 5. Advanced Customization Capability: We can produce custom sizes, lengths, wall thicknesses and end processing according to your drawings 6. Global Power Supply Chain Experience: We have extensive experience supplying to major power companies worldwide with reliable on-time delivery 7. Professional Technical Support: Our team of metallurgical engineers and power industry specialists provides expert guidance on material selection 8. One-Stop Solution: We provide complete solutions from raw material supply to pre-fabricated assemblies, reducing your supply chain complexity |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full MTR including chemical analysis, mechanical properties, grain size and NDT results. Creep and corrosion test reports available upon request
2. Full Material Traceability: Every product has a unique heat number and complete traceability documentation from raw material to finished product 3. Value-Added Processing: We offer precision cutting, CNC bending, welding, end processing and surface finishing services 4. Prototype Development Support: We support small batch prototype orders with fast turnaround times 5. Emergency Response Service: We provide 24/7 emergency service for unplanned power plant shutdowns with expedited shipping 6. Market Growth: The global Inconel 625 market for power generation is projected to grow at a CAGR of over 6% through 2030, driven by increasing demand for clean energy and nuclear power 7. 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, quantity and destination |
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