Monel 400 (UNS N04400) heat exchanger bar is a nickel-copper solid solution alloy bar with exceptional resistance to seawater corrosion, hydrofluoric acid attack and sulfuric acid corrosion, specially engineered for heat exchanger components operating in marine, chemical and offshore industrial environments.
As the most cost-effective corrosion-resistant alloy for seawater service, Monel 400 bar features excellent mechanical properties from sub-zero temperatures up to 480℃, outstanding weldability and good formability, making it the industry-standard material for manufacturing heat exchanger tubes, tube sheets, baffles and supports in seawater cooling systems.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B164, ASME SB164, ASTM B165, ASME SB165, DIN 17743, EN 2.4360
2. Heat Exchanger Specific Standards: TEMA (Tubular Exchanger Manufacturers Association), HEI (Heat Exchange Institute), API 660 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: Monel 400 (Nickel-Copper Alloy, Marine-Grade Corrosion Resistant Heat Exchanger Grade)
2. International Designations: UNS N04400, W.Nr. 2.4360, Alloy 400, NiCu30Fe 3. Equivalent Grades: NS3301 (China), Monel 400 (USA), Monel 400 (UK), fully compatible with all global heat exchanger manufacturing standards 4. Special Grade: Low-carbon version available for improved weldability and resistance to intergranular corrosion |
| Chemical Composition (Weight %) | 1. Nickel (Ni): 63.0 – 70.0 (base element for overall corrosion resistance)
2. Copper (Cu): 28.0 – 34.0 (primary element for seawater and acid resistance) 3. Iron (Fe): ≤2.5 (for improved strength and formability) 4. Manganese (Mn): ≤2.0 5. Silicon (Si): ≤0.50 6. Carbon (C): ≤0.30 (standard grade); ≤0.15 (low carbon grade) 7. Sulfur (S): ≤0.024 8. Phosphorus (P): ≤0.025 |
| Mechanical Properties (Annealed State) | 1. Tensile Strength (Room Temperature): 480 – 650 MPa
2. 0.2% Yield Strength (Room Temperature): ≥220 MPa 3. Elongation (δ5): ≥40% (excellent formability for complex components) 4. Reduction of Area: ≥50% 5. Hardness (HB): 110 – 170 6. Impact Toughness (Akv, Room Temperature): ≥180 J 7. Tensile Strength (200℃): ≥420 MPa 8. Tensile Strength (400℃): ≥320 MPa 9. Modulus of Elasticity: 179 GPa 10. Thermal Expansion Coefficient: 13.9 × 10⁻⁶ /℃ (20-100℃) |
| Dimensional Tolerance (Heat Exchanger Precision Grade) | 1. Diameter Tolerance:
– Precision Grade (≤50mm): ±0.05mm – Standard Grade (50-100mm): ±0.10mm – Heavy Section (100-300mm): ±0.20mm – Ultra-Precision Grade available upon request: ±0.02mm 2. Length Tolerance: – Fixed Length (1m-6m): ±0.5mm/m – Maximum Full-Length Tolerance: ≤2.0mm – Custom Length up to 12m available 3. Roundness Tolerance: ≤0.01mm (≤50mm); ≤0.02mm (50-100mm); ≤0.03mm (100-300mm) 4. Concentricity Tolerance: ≤0.02mm for precision machined bars |
| Heat Exchanger Operating Conditions (Detailed) | 1. Marine Engineering Industry:
– Seawater cooling systems: Fresh and saltwater, temperatures up to 120℃, pressures up to 40 bar – Desalination plants: Brine solutions, temperatures up to 150℃, pressures up to 30 bar – Offshore platforms: Seawater heat exchangers, produced water treatment, temperatures up to 100℃ – Shipbuilding: Main engine coolers, auxiliary coolers, condenser tubes, temperatures up to 180℃ 2. Chemical Processing Industry: – Hydrofluoric acid production: 0-60% HF solution, temperatures up to 120℃ – Sulfuric acid processing: 0-80% H₂SO₄, temperatures up to 80℃ – Chlor-alkali production: Caustic soda solutions, temperatures up to 150℃ – Organic chemical production: Acetic acid, formic acid, solvents, temperatures up to 200℃ 3. Oil and Gas Industry: – Sour gas processing: H₂S, CO₂, chlorides, temperatures up to 200℃, pressures up to 100 bar – Refinery applications: Crude oil distillation, hydrotreating units, temperatures up to 300℃ – Natural gas processing: Amine scrubbers, glycol dehydration units, temperatures up to 180℃ 4. Power Generation Industry: – Fossil fuel power plants: Surface condensers, cooling water systems, temperatures up to 150℃ – Nuclear power plants: Auxiliary cooling systems, spent fuel pool heat exchangers, temperatures up to 120℃ 5. Food and Pharmaceutical Industry: – Food processing: Sterilization systems, pasteurizers, temperatures up to 180℃ – Pharmaceutical production: Clean-in-place (CIP) systems, fermentation processes, temperatures up to 150℃ 6. Extreme Operating Conditions: – Maximum continuous operating temperature: 480℃ in oxidizing environments – Maximum continuous operating temperature: 425℃ in reducing environments – Excellent performance at cryogenic temperatures down to -253℃ – Pressure rating: up to 150 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 seawater and acidic environments – Technical Requirements: Minimum bend radius 1.5× tube diameter, no wall thinning >12% at bend, no cracking or wrinkling – Monel 400 Advantage: Excellent hot and cold formability, maintains full corrosion resistance after bending, no post-bend heat treatment required – 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, marine engine condensers, seawater cooling condensers – Technical Requirements: High corrosion resistance to seawater, excellent thermal conductivity, tight dimensional tolerances, resistance to vibration-induced fatigue – Monel 400 Advantage: 5-10x longer service life than copper-nickel alloys in polluted seawater, immune to biofouling and erosion-corrosion – Available Sizes: OD 10mm – 30mm, wall thickness 0.8mm – 3mm, lengths up to 12m 3. Evaporator Tubes: – Application: Desalination plants, chemical evaporators, food processing evaporators, brine evaporators – Technical Requirements: Resistance to fouling, excellent heat transfer properties, resistance to thermal cycling – Monel 400 Advantage: Smooth surface reduces scaling and fouling, excellent thermal conductivity, withstands repeated heating and cooling cycles – 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 – Monel 400 Advantage: Maintains strength at elevated temperatures, excellent resistance to thermal fatigue, no thermal deformation – Available Sizes: OD 16mm – 50mm, wall thickness 1.5mm – 5mm 5. Cooler Tubes: – Application: Process fluid coolers, hydraulic oil coolers, compressor intercoolers, marine engine coolers – Technical Requirements: High pressure rating, excellent corrosion resistance, tight dimensional tolerances – Monel 400 Advantage: High strength-to-weight ratio, withstands high operating pressures, immune to corrosion from process fluids 6. Tube Sheets and Baffles: – Application: Structural components of shell and tube heat exchangers in marine and chemical service – Technical Requirements: Flatness tolerance, hole position accuracy, corrosion resistance, compatibility with tube materials – Monel 400 Advantage: Excellent machinability, maintains dimensional stability, no galvanic corrosion with Monel 400 tubes 7. Support Rods and Spacers: – Application: Supporting tube bundles in heat exchangers operating in corrosive environments – Technical Requirements: Straightness, corrosion resistance, mechanical strength – Monel 400 Advantage: Excellent straightness, immune to galvanic corrosion, long service life in seawater and acidic environments |
| Surface Quality Requirements (Detailed) | 1. Standard Pickled Surface (ASTM B164):
– Surface Finish: Ra ≤3.2μm – Process: Hot rolled, annealed, pickled and passivated – Appearance: Uniform silver-gray matte finish, free of scale, oxides and discoloration – Application: General purpose 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 – Anti-Fouling Coatings: Optional epoxy or PTFE coatings for severe fouling environments 5. Surface Inspection: – 100% visual inspection of all surfaces by trained inspectors – Surface roughness measurement using calibrated profilometers at multiple points along each bar – Dye penetrant inspection available upon request for critical components |
| Straightness Requirements (Detailed) | 1. Standard Straightness (ASTM B164):
– Straightness Tolerance: ≤0.5mm/m for bars up to 6m in length – Maximum Full-Length Straightness Error: ≤3.0mm for 6m long bars – Application: General purpose heat exchanger components, baffles, supports, tube sheets 2. Precision Straightness: – Straightness Tolerance: ≤0.25mm/m for bars up to 6m in length – Maximum Full-Length Straightness Error: ≤1.5mm for 6m long bars – Application: Heat exchanger tubes, tube bundle support rods, long components requiring tight alignment 3. Ultra-Precision Straightness: – Straightness Tolerance: ≤0.1mm/m for bars up to 6m in length – Maximum Full-Length Straightness Error: ≤0.6mm for 6m long bars – Application: High-precision heat exchangers, nuclear power applications, aerospace heat exchangers 4. Straightening Process: – All bars undergo multi-roll straightening after annealing – Precision bars 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 bars and tubes 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 bar 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: – Bars 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 Monel 400 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 tubes 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: – Tubes are sealed at both ends with high-pressure hydraulic fittings – Water is pumped into the tube 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 tubes 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: – Tubes 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 bars – 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: – Bars bundled by length to facilitate easy identification and handling – Long bars 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 tubes – 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 nickel-copper alloy heat exchanger components for over 20 years, with deep understanding of the unique requirements of marine and chemical 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 Monel 400 Production Line: We operate a dedicated production line for Monel 400 products, ensuring strict control over chemical composition, 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 tubes. 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 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 Monel 400 heat exchanger bars or tubes for your marine, chemical or offshore industrial 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, seawater corrosion resistance, testing requirements or heat exchanger design recommendations, our alloy specialists are available to assist you promptly. 3. Emily PIPE is your trusted partner for high-performance nickel-copper alloy heat exchanger solutions. Contact us today to discuss how our Monel 400 products can help you improve the reliability and service life of your heat exchangers in the most demanding corrosive operating conditions. |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full Material Test Report (MTR) including chemical composition analysis, mechanical properties testing, heat treatment records, eddy current test results and hydrostatic test results.
2. Full Material Traceability: Every bar and tube 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 Monel 400 bar and tube sizes, 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. |