Alloy 800 (UNS N08800) heat exchanger pipe is a cost-effective iron-nickel-chromium solid solution alloy pipe with excellent high-temperature oxidation resistance, carburization resistance and stress corrosion cracking resistance. It maintains stable mechanical properties up to 900℃, specially engineered for mid-to-high temperature heat exchanger applications where optimal cost-performance balance is critical.
As the industry-standard general-purpose high-temperature alloy, Alloy 800 pipe offers comparable oxidation resistance to Inconel 600 at 30-40% lower material cost, with excellent formability, weldability and long-term thermal stability. It is the most widely used material for manufacturing heat exchanger tubes, tube sheets and baffles in power generation, petrochemical and heat treatment industries.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B407 (Seamless Pipe), ASTM B514 (Welded Pipe), ASTM B515, ASME SB407, ASME SB514, ASME SB515, DIN 17459, EN 1.4876
2. Heat Exchanger Specific Standards: TEMA (Tubular Exchanger Manufacturers Association), HEI (Heat Exchange Institute), API 660, API 661 3. Corrosion Service Standards: NACE MR0175/ISO 15156, NACE MR0103 4. Testing Standards: ASTM E8 (Tensile), ASTM E23 (Impact), ASTM A450 (Hydrostatic), ASTM E243 (Eddy Current), ASTM A388 (Ultrasonic) 5. Quality Management Standards: ISO 9001, ISO 14001, AS9100, PED 2014/68/EU |
| Material Grade | 1. Main Grade: Alloy 800 (Iron-Nickel-Chromium Alloy, General-Purpose High-Temperature Heat Exchanger Grade)
2. International Designations: UNS N08800, W.Nr. 1.4876, Incoloy 800, X10NiCrAlTi32-20 3. Equivalent Grades: NS1101 (China), Alloy 800 (USA), Nicrofer 3220 (Germany), fully compatible with all global heat exchanger manufacturing standards 4. Special Grades: Alloy 800H (high carbon) and Alloy 800HT (high temperature) available for applications requiring enhanced creep strength above 600℃ |
| Chemical Composition (Weight %) | 1. Nickel (Ni): 30.0 – 35.0 (for high-temperature stability and corrosion resistance)
2. Chromium (Cr): 19.0 – 23.0 (for oxidation resistance and high-temperature strength) 3. Iron (Fe): Balance (base element for cost-effectiveness and formability) 4. Aluminum (Al): 0.15 – 0.60 (for enhanced oxidation resistance) 5. Titanium (Ti): 0.15 – 0.60 (for grain refinement and improved strength) 6. Carbon (C): ≤0.10 (standard grade); 0.05-0.10 (Alloy 800H); 0.06-0.10 (Alloy 800HT) 7. Manganese (Mn): ≤1.50 8. Silicon (Si): ≤1.00 9. Sulfur (S): ≤0.015 10. Phosphorus (P): ≤0.020 11. Copper (Cu): ≤0.75 |
| Mechanical Properties (Annealed State) | 1. Tensile Strength (Room Temperature): 550 – 700 MPa
2. 0.2% Yield Strength (Room Temperature): ≥240 MPa 3. Elongation (δ5): ≥40% (excellent formability for complex components) 4. Reduction of Area: ≥50% 5. Hardness (HB): 120 – 180 6. Impact Toughness (Akv, Room Temperature): ≥180 J 7. Tensile Strength (300℃): ≥420 MPa 8. Tensile Strength (500℃): ≥320 MPa 9. Tensile Strength (800℃): ≥120 MPa 10. Modulus of Elasticity: 196 GPa 11. Thermal Expansion Coefficient: 15.1 × 10⁻⁶ /℃ (20-100℃) |
| Dimensional Tolerance (Heat Exchanger Precision Grade) | 1. Outer Diameter Tolerance:
– Precision Cold Drawn (≤50mm): ±0.05mm – Standard Grade (50-100mm): ±0.10mm – Heavy Section (100-200mm): ±0.20mm – Ultra-Precision Grade available upon request: ±0.02mm 2. Wall Thickness Tolerance: ±10% of nominal wall thickness 3. Length Tolerance: – Fixed Length (1m-6m): ±0.5mm/m – Maximum Full-Length Tolerance: ≤2.0mm – Custom Length up to 12m available 4. Roundness Tolerance: ≤0.01mm (≤50mm); ≤0.02mm (50-100mm); ≤0.03mm (100-200mm) 5. Concentricity Tolerance: ≤0.02mm for precision machined pipes |
| Heat Exchanger Operating Conditions (Detailed) | 1. Power Generation Industry:
– Fossil fuel power plants: Superheater tubes, reheater tubes, steam generator tubes, feedwater heaters, temperatures up to 650℃, pressures up to 200 bar. Alloy 800 forms a protective chromium oxide film that prevents oxidation and scaling at high temperatures. – Nuclear power plants: Steam generator tubes, pressurizer tubes, primary and secondary coolant systems, temperatures up to 350℃, pressures up to 150 bar. It is the standard material for nuclear steam generators due to its excellent SCC resistance in high-temperature water. – Waste-to-energy plants: Flue gas heat exchangers, boiler tubes, temperatures up to 850℃. Resists corrosion from acidic flue gases and fly ash. – Concentrated solar power (CSP) plants: Receiver tubes, heat transfer fluid systems, temperatures up to 600℃. 2. Petrochemical Industry: – Ethylene production: Cracking furnace tubes, quench coolers, transfer line exchangers, temperatures up to 900℃. Excellent resistance to carburization and thermal fatigue. – Refinery applications: Catalytic reformers, hydrocrackers, desulfurization units, temperatures up to 650℃. – Natural gas processing: Amine scrubbers, glycol dehydration units, temperatures up to 250℃. – Ammonia synthesis: Converter tubes, heat exchangers, temperatures up to 550℃. 3. Heat Treatment Industry: – Industrial furnaces: Radiant tubes, muffles, retorts, furnace fixtures, temperatures up to 900℃. Withstands repeated heating and cooling cycles without deformation. – Heat treatment equipment: Quench tanks, salt bath containers, temperatures up to 800℃. 4. Chemical Processing Industry: – Nitric acid production: Evaporator tubes, heater tubes, 0-65% HNO₃ solution, temperatures up to 150℃. Excellent resistance to oxidizing acids. – Organic chemical production: High-temperature reactors, distillation columns, temperatures up to 500℃. – Food processing: Sterilization systems, pasteurizers, temperatures up to 180℃. 5. Extreme Operating Conditions: – Maximum continuous operating temperature: 900℃ in oxidizing environments – Maximum continuous operating temperature: 800℃ in reducing environments – Excellent resistance to thermal cycling and thermal shock – Pressure rating: up to 200 bar depending on design and temperature |
| Heat Exchanger Tube Bundle Applications (Detailed) | 1. U-Bend Tubes:
– Application: Shell and tube heat exchangers, condensers, evaporators requiring thermal expansion compensation in mid-to-high temperature environments – Technical Requirements: Minimum bend radius 1.5× tube diameter, no wall thinning >12% at bend, no cracking or wrinkling – Alloy 800 Advantage: Excellent hot and cold formability, maintains full mechanical properties after bending, no post-bend heat treatment required for most applications – Available Sizes: OD 6mm – 50mm, wall thickness 0.5mm – 5mm, bend radii 1.5D – 10D 2. Condenser Tubes: – Application: Power plant surface condensers, refinery condensers, nuclear power plant steam generators – Technical Requirements: High corrosion resistance to cooling water, excellent thermal conductivity, tight dimensional tolerances, resistance to vibration-induced fatigue – Alloy 800 Advantage: Immune to chloride-induced stress corrosion cracking, 5-10x longer service life than stainless steel in high-temperature cooling water – Available Sizes: OD 10mm – 30mm, wall thickness 0.8mm – 3mm, lengths up to 12m 3. Evaporator Tubes: – Application: Chemical evaporators, desalination plants, food processing evaporators, brine evaporators – Technical Requirements: Resistance to fouling, excellent heat transfer properties, resistance to thermal cycling – Alloy 800 Advantage: Smooth surface reduces scaling and fouling, excellent thermal conductivity, withstands repeated heating and cooling cycles without deformation – Available Sizes: OD 12mm – 40mm, wall thickness 1.0mm – 4mm 4. Reboiler Tubes: – Application: Distillation columns, chemical processing reboilers, refinery reboilers, sour water strippers – Technical Requirements: High-temperature strength, resistance to thermal fatigue, resistance to process fluids – Alloy 800 Advantage: Maintains strength at elevated temperatures, excellent resistance to thermal fatigue, no thermal deformation even after long-term high-temperature service – Available Sizes: OD 16mm – 50mm, wall thickness 1.5mm – 5mm 5. Superheater and Reheater Tubes: – Application: Fossil fuel power plants, waste-to-energy plants, industrial boilers – Technical Requirements: Exceptional high-temperature oxidation resistance, good creep strength, resistance to sulfidation – Alloy 800 Advantage: Forms a protective chromium oxide film at high temperatures, excellent creep resistance, service life up to 15 years in boiler applications – Available Sizes: OD 20mm – 60mm, wall thickness 2.0mm – 6mm 6. Tube Sheets and Baffles: – Application: Structural components of mid-to-high temperature shell and tube heat exchangers – Technical Requirements: Flatness tolerance, hole position accuracy, high-temperature strength, corrosion resistance – Alloy 800 Advantage: Excellent machinability, maintains dimensional stability at high temperatures, compatible with all tube materials 7. Support Rods and Spacers: – Application: Supporting tube bundles in high-temperature heat exchangers – Technical Requirements: Straightness, high-temperature strength, corrosion resistance – Alloy 800 Advantage: Excellent straightness, immune to galvanic corrosion with Alloy 800 tubes, long service life at elevated temperatures |
| Surface Quality Requirements (Detailed) | 1. Standard Pickled Surface (ASTM B407):
– Surface Finish: Ra ≤3.2μm – Process: Hot rolled, cold drawn, solution annealed, pickled and passivated – Appearance: Uniform silver-gray matte finish, free of scale, oxides and discoloration – Application: General purpose industrial heat exchanger components, tube sheets, baffles, supports – Defect Control: No cracks, folds, seams, pits, inclusions or other harmful defects allowed; minor surface imperfections ≤0.05mm deep acceptable 2. Mechanically Polished Surface: – Surface Finish: Ra ≤1.6μm (standard polish), Ra ≤0.8μm (fine polish) – Process: Pickled surface followed by centerless grinding or belt polishing – Appearance: Uniform bright metallic finish, smooth and reflective – Application: Heat exchanger tubes requiring reduced fouling, food processing applications, pharmaceutical industry – Defect Control: No visible surface defects, uniform surface texture, no grinding marks or chatter marks 3. Electropolished Surface: – Surface Finish: Ra ≤0.4μm (standard electropolish), Ra ≤0.2μm (ultra-fine electropolish) – Process: Mechanically polished surface followed by electrochemical polishing – Appearance: Mirror-like finish, extremely smooth and clean – Application: High-purity pharmaceutical applications, semiconductor manufacturing, ultra-clean heat exchangers – Defect Control: Absolutely no surface defects, uniform electropolishing across entire surface, no pitting or staining 4. Special Surface Treatments: – Passivation: All surfaces passivated according to ASTM A967 to enhance corrosion resistance – Shot Peening: Available for improved fatigue resistance in high-vibration applications – Aluminizing: Available for enhanced high-temperature oxidation resistance up to 1100℃ 5. Surface Inspection: – 100% visual inspection of all surfaces by trained inspectors – Surface roughness measurement using calibrated profilometers at multiple points along each pipe – Dye penetrant inspection available upon request for critical components |
| Straightness Requirements (Detailed) | 1. Standard Straightness (ASTM B407):
– Straightness Tolerance: ≤0.5mm/m for pipes up to 6m in length – Maximum Full-Length Straightness Error: ≤3.0mm for 6m long pipes – Application: General purpose industrial heat exchanger components, baffles, supports, tube sheets 2. Precision Straightness: – Straightness Tolerance: ≤0.25mm/m for pipes up to 6m in length – Maximum Full-Length Straightness Error: ≤1.5mm for 6m long pipes – Application: Heat exchanger tubes, tube bundle support rods, long components requiring tight alignment 3. Ultra-Precision Straightness: – Straightness Tolerance: ≤0.1mm/m for pipes up to 6m in length – Maximum Full-Length Straightness Error: ≤0.6mm for 6m long pipes – Application: High-precision heat exchangers, nuclear power applications, aerospace heat exchangers 4. Straightening Process: – All pipes undergo multi-roll straightening after solution annealing – Precision pipes undergo additional centerless grinding and straightening – Straightness verified using laser straightness measurement systems with 0.01mm accuracy 5. Importance of Straightness: – Ensures proper alignment of tube bundles, preventing tube-to-tube contact and wear – Reduces vibration and noise in operating heat exchangers – Facilitates easy assembly and installation, reducing labor costs – Prevents stress concentrations that could lead to premature fatigue failure – Ensures uniform heat transfer across the entire tube bundle |
| Eddy Current Testing (ET) (Detailed) | 1. Testing Standard: ASTM E243, ASME V Article 8, TEMA RCB-7.3
2. Testing Frequency: 100% of all heat exchanger pipes undergo eddy current testing 3. Equipment: Computerized multi-frequency eddy current testing systems with automatic defect marking and digital data recording 4. Testing Parameters: – Frequency Range: 10kHz – 2MHz depending on pipe diameter and wall thickness – Sensitivity: Calibrated to detect artificial defects of 0.3mm depth (5% of wall thickness) or smaller – Defect Types Detected: Surface cracks, subsurface cracks, pits, inclusions, seams, laps and wall thickness variations 5. Testing Procedure: – Pipes pass through encircling coils at controlled speed (1-5m/s) – System automatically records all test data and marks defective areas with paint – Defective sections are cut out and removed – Retesting performed on repaired sections to ensure compliance 6. Acceptance Criteria: – No defects exceeding 5% of wall thickness allowed – No linear defects of any length allowed – Isolated pits ≤0.3mm deep acceptable if spaced ≥50mm apart 7. Additional Testing Options: – Ultrasonic Testing (UT) according to ASTM A388 for internal defect detection – Dye Penetrant Testing (PT) according to ASTM E165 for surface defect detection – Magnetic Particle Testing (MT) not applicable as Alloy 800 is non-magnetic 8. Documentation: – Complete eddy current test report provided with each shipment – Test data stored digitally for minimum 15 years for traceability |
| Hydrostatic Pressure Testing (Detailed) | 1. Testing Standard: ASTM A450, ASME B31.3, TEMA RCB-7.2
2. Testing Frequency: 100% of all heat exchanger pipes undergo hydrostatic pressure testing 3. Test Pressure Calculation: – Standard Test Pressure: 1.5× design pressure – Minimum Test Pressure: 10 bar – Maximum Test Pressure: Limited by yield strength (≤80% of yield strength at test temperature) 4. Test Medium: – Deionized water with chloride content ≤25ppm to prevent corrosion – Optional corrosion inhibitors added for long-term storage – Water temperature maintained between 10℃ and 50℃ to prevent condensation 5. Testing Procedure: – Pipes are sealed at both ends with high-pressure hydraulic fittings – Water is pumped into the pipe until test pressure is reached – Pressure held for minimum 10 seconds (standard) or 30 seconds (critical applications) – Visual inspection for leaks, bulging or deformation during pressure holding – Pressure released and pipes drained and dried after testing 6. Acceptance Criteria: – No leakage of any kind allowed – No permanent deformation or bulging allowed – No pressure drop during holding period allowed 7. Additional Testing Options: – Pneumatic pressure testing available upon request using dry nitrogen – Burst pressure testing available for design verification – Cyclic pressure testing available for fatigue life evaluation 8. Post-Testing Processing: – Pipes are thoroughly dried internally and externally using compressed air – Ends are capped immediately to prevent moisture ingress during storage and transportation – Optional passivation performed after testing to restore corrosion resistance |
| Fixed Length Specifications (Detailed) | 1. Standard Fixed Lengths:
– 1000mm, 2000mm, 3000mm, 4000mm, 5000mm, 6000mm – Length Tolerance: ±0.5mm/m, maximum ±2.0mm for 6m lengths – Squareness of Cut: ≤0.1mm per 100mm diameter 2. Custom Fixed Lengths: – Any length from 100mm to 12000mm available upon request – Length Tolerance: ±0.3mm for lengths ≤3m, ±0.5mm for lengths >3m – Ultra-precision cutting available with tolerance ±0.1mm 3. Long Length Products: – Maximum single length: 12000mm – Ideal for large heat exchangers requiring long tubes without welded joints – Reduces number of welds, improving reliability and reducing maintenance costs 4. Cutting Methods: – Band saw cutting for standard lengths – CNC lathe cutting for precision lengths with square ends – Abrasive cutting for small diameter pipes – Water jet cutting available for sensitive materials 5. End Preparation: – All cut ends deburred and chamfered as standard – Optional end facing and turning available 6. Length Verification: – All lengths verified using calibrated measuring tapes or laser distance meters – 100% inspection of all cut lengths 7. Packaging by Length: – Pipes bundled by length to facilitate easy identification and handling – Long pipes packaged in steel frames to prevent bending during transportation |
| Tube End Processing Standards (Detailed) | 1. Plain Square End (Standard):
– Standard: ASME B16.25, TEMA RCB-7.4 – Dimensions: Ends cut square to within 0.1mm per 100mm diameter – Chamfer: 0.5×45° external chamfer to remove burrs – Application: General purpose tube-to-tubesheet welding, expansion joints 2. Beveled End for Welding: – Standard: ASME B16.25, AWS D10.9 – Bevel Angle: 30° ±2.5° (standard), 37.5° ±2.5° (heavy wall) – Root Face: 1.6mm ±0.8mm – Application: High-pressure piping, tube-to-tubesheet welding in critical applications 3. Chamfered End: – Standard: Customer specific – Chamfer Angles: 15°, 30°, 45°, 60° available – Chamfer Length: 1mm – 10mm depending on wall thickness – Application: Tube expansion, assembly into fittings 4. Expanded End: – Standard: TEMA RCB-7.5 – Expansion Ratio: Up to 15% of original diameter – Length of Expansion: 10mm – 50mm depending on tube diameter – Application: Tube-to-tubesheet expansion joints, quick connect fittings 5. Swaged End (Reduced End): – Standard: ASME B16.19 – Reduction Ratio: Up to 50% of original diameter – Length of Swage: 2× diameter minimum – Application: Connection to smaller diameter piping, nozzles 6. Flared End: – Standard: SAE J514, ISO 8434 – Flare Angle: 37° (JIC), 45° (SAE), 60° (metric) – Application: Flare fittings, hydraulic connections 7. Threaded End: – Standard: NPT, BSPP, BSPT, metric threads – Thread Class: Class 2A (external), Class 2B (internal) – Application: Threaded connections, instrumentation fittings 8. End Protection: – All tube ends protected with plastic caps during storage and transportation – Heavy-duty metal caps available for heavy wall pipes – Ends sealed to prevent moisture and contamination ingress |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Superalloy Expertise: We have been manufacturing and exporting high-performance iron-nickel-chromium alloy heat exchanger components for over 20 years, with deep understanding of the unique requirements of mid-to-high temperature industrial environments.
2. Complete International Certifications: Our production facilities are certified to ISO 9001, ISO 14001, AS9100 and PED, with all products complying with ASTM, ASME, NACE and API standards. 3. Dedicated Alloy 800 Production Line: We operate a dedicated production line for Alloy 800 products, ensuring strict control over chemical composition (especially aluminum and titanium content), mechanical properties and surface quality. 4. Full-Process Quality Control: We implement a comprehensive quality control system from raw material inspection to finished product testing, including 100% eddy current testing and hydrostatic testing for all heat exchanger pipes. 5. Advanced Customization Capability: We can produce custom sizes, lengths, surface finishes and end treatments according to your drawings and technical specifications, including complex U-bend tubes and large tube sheets. 6. In-House Testing Laboratory: We operate a fully equipped testing laboratory that can perform chemical analysis, mechanical testing, corrosion testing and non-destructive testing, providing third-party verified test reports. 7. Global One-Stop Service: We handle everything from material production and custom processing to international shipping and customs clearance, with reliable logistics partners ensuring on-time delivery to any industrial facility worldwide. 8. Professional Technical Support: Our team of metallurgical engineers and heat exchanger specialists provides expert guidance on material selection, design optimization and fabrication techniques. |
| Inquiry Guidance Words | 1. If you need high-quality Alloy 800 heat exchanger pipes for your power generation, petrochemical or heat treatment project, please send us your specific requirements including dimensions, quantity, required standards, operating conditions and delivery date, and we will provide a detailed quotation within 12 hours.
2. For any questions about material properties, high-temperature performance, testing requirements or heat exchanger design recommendations, our alloy specialists are available to assist you promptly. 3. Emily PIPE is your trusted partner for cost-effective high-performance alloy heat exchanger solutions. Contact us today to discuss how our Alloy 800 products can help you improve the reliability and service life of your heat exchangers while optimizing your total project costs. |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full Material Test Report (MTR) including chemical composition analysis (with verified aluminum and titanium content), mechanical properties testing, heat treatment records, eddy current test results and hydrostatic test results.
2. Full Material Traceability: Every pipe comes with a unique heat number and complete traceability documentation from raw material ore to finished product, meeting the strictest industrial project requirements. 3. Value-Added Processing: We offer comprehensive value-added services including precision cutting, machining, bending, welding, end forming and assembly, providing ready-to-install heat exchanger components. 4. Professional Industrial Packaging: We use protective plastic caps on both ends, anti-corrosion wrapping, wooden crates and steel frames to prevent damage during long-distance international transportation. 5. Urgent Order Support: We maintain a large inventory of standard Alloy 800 pipe sizes in both standard and high-temperature grades, enabling us to fulfill urgent orders within 7-15 days. 6. Prototype Development Support: We support small batch prototype orders with fast turnaround times to help you accelerate product development and testing. 7. After-Sales Service: We provide lifetime technical support for all our products, including on-site assistance for fabrication, installation and troubleshooting. 8. Sustainability Commitment: All our products are manufactured using sustainable practices and are 100% recyclable, helping you meet your environmental targets. |