Inconel 625 Heat Exchanger Tube is a high-performance nickel-chromium-molybdenum-niobium alloy heat exchange tube, specially developed for heat exchanger manufacturers. It features ultra-high dimensional precision and strict quality testing, which are the core concerns of heat exchanger manufacturers. With excellent corrosion resistance, high-temperature stability and fatigue resistance, it can be directly integrated into various heat exchanger systems (condensers, coolers, etc.). Widely used in chemical, power, nuclear power, marine engineering and oil and gas industries, it can operate stably for a long time under harsh working conditions, effectively improving heat exchange efficiency, reducing equipment maintenance costs, and fully meeting the mass production and precision assembly needs of heat exchanger manufacturers.
Inconel 625 Heat Exchanger Tube
| Item | Details |
|---|---|
| Product Brief Introduction | Inconel 625 Heat Exchanger Tube is a high-performance nickel-chromium-molybdenum-niobium alloy heat exchange tube, specially developed for heat exchanger manufacturers. It features ultra-high dimensional precision and strict quality testing, which are the core concerns of heat exchanger manufacturers. With excellent corrosion resistance, high-temperature stability and fatigue resistance, it can be directly integrated into various heat exchanger systems (condensers, coolers, etc.). Widely used in chemical, power, nuclear power, marine engineering and oil and gas industries, it can operate stably for a long time under harsh working conditions, effectively improving heat exchange efficiency, reducing equipment maintenance costs, and fully meeting the mass production and precision assembly needs of heat exchanger manufacturers. |
| Core Selling Points (Highlight Precision & Testing) | 1. Ultra-high dimensional precision: Strictly control outer diameter, wall thickness and length tolerances, ensuring precise fit with heat exchanger tube sheets, eliminating assembly failures caused by dimensional deviations (core concern of manufacturers);
2. Strict quality testing: 100% full-tube detection, including ET Eddy Current Testing, Hydrostatic Testing, surface and straightness testing, completely eliminating hidden defects such as cracks and uneven thickness (core concern of manufacturers); 3. Excellent corrosion resistance: Resistant to seawater, acid-base media, high-temperature steam and chemical pollutants, no pitting or crevice corrosion, extending the service life of heat exchangers; 4. Strong adaptability: Suitable for tube bundle assembly, U-bend forming and condenser matching, with excellent welding performance, ensuring the integrity of heat exchanger components; 5. Stable batch performance: Uniform chemical composition and mechanical properties, suitable for large-scale mass production of heat exchangers, ensuring consistent product quality; 6. Customizable service: Support customized fixed length, tube end treatment and precision requirements, fully matching the design needs of different types of heat exchangers. |
| Heat Exchange Working Conditions | Suitable for various harsh heat exchange scenarios required by heat exchanger manufacturers, including:
1. Chemical industry: High-temperature acid-base medium heat exchange, corrosive fluid cooling (tolerating 98% sulfuric acid, molten sulfur, chemical solvents); 2. Power industry: Power station condensers, boiler heat exchangers (adapting to high-temperature steam ≤650℃, high pressure ≤15000psi); 3. Nuclear power industry: Nuclear reactor cooling systems (resisting radioactive media, high temperature, high pressure and low-temperature impact); 4. Marine engineering: Ship heat exchangers, seawater desalination equipment (long-term resistance to seawater immersion and salt spray erosion); 5. Oil and gas industry: Oil and gas cooling, drilling fluid heat exchange (resisting high-salt, high-corrosion media and alternating temperature and humidity); 6. Low-temperature scenarios: Low-temperature condensation heat exchange (minimum -253℃), no brittle fracture, maintaining stable heat exchange performance; 7. Continuous operation: 24-hour uninterrupted work, no leakage, no deformation, meeting the long-term operation needs of heat exchangers. |
| Tube Bundle, U Bend Tube & Condenser Tube | 1. Tube Bundle: Adaptable to fixed tube sheet, floating head and U-tube heat exchanger tube bundle assembly; high straightness and uniform size ensure uniform gap after assembly, improving heat exchange efficiency and reducing vibration noise; weld strength ≥90% of base metal, no cracks or pores, ensuring the overall stability of the tube bundle.
2. U Bend Tube: Bend radius 1.5D~5D (customizable), laser-calibrated bend angle (tolerance ±0.5°), no wrinkles or cracks; after bending, outer diameter tolerance ±0.02mm, wall thickness thinning ≤5%, no performance attenuation; after forming, ET Eddy Current Testing and Hydrostatic Testing are required to eliminate bending defects. 3. Condenser Tube: Special for power station, ship and chemical condensers, used for steam condensation and fluid cooling; smooth surface, low scaling, high thermal conductivity, improving condensation efficiency; strict dimensional control, suitable for condenser tube sheet installation, no leakage risk. |
| Surface Quality (Core Concern of Manufacturers) | 1. Surface State: Annealed and pickled, clean and free of oxide scale, scratches, inclusions, pores and cracks, no obvious color difference;
2. Roughness: Inner and outer surface Ra ≤0.8μm (precision grade Ra ≤0.25μm), reducing heat exchange resistance and improving efficiency; 3. Quality Control: 100% visual inspection + roughness testing, unqualified products are directly eliminated, ensuring consistent surface quality; 4. Optional Treatment: Passivation, epoxy coating or mirror polishing can be customized, and hygienic grade Ra ≤0.4~0.8μm is available for special scenarios. |
| Straightness (Core Concern of Manufacturers) | 1. Standard Requirement: Straightness ≤0.2mm/m, full-length straightness error ≤0.5mm/6m (far exceeding ordinary standards);
2. Precision Guarantee: Precision straightening process + laser calibration, ensuring no bending or offset, suitable for precise perforation of tube sheets; 3. Testing: Each tube is tested for straightness, unqualified products are not allowed to leave the factory; 4. Significance: Avoid uneven gaps and stress during tube bundle assembly, extend the service life of heat exchangers; 5. Custom Precision: Higher precision (≤0.15mm/m) can be customized for high-end precision heat exchangers. |
| Eddy Current Testing (ET) (Core Concern of Manufacturers) | 1. Standard: Implemented in accordance with ASTM E2439 and GB/T 12606, calibrated with standard test blocks;
2. Scope: 100% full-tube detection, covering the entire length, tube ends and welds, detecting internal/external cracks, inclusions, uneven wall thickness; 3. Precision: Detectable microcracks ≤0.1mm, no missed or false detection, ensuring no hidden defects; 4. Report: Detailed ET test report for each batch, traceable and verifiable, meeting project acceptance requirements; 5. Significance: Prevent leakage and pipe burst during heat exchanger operation, ensure safe and stable operation. |
| Hydrostatic Testing (Core Concern of Manufacturers) | 1. Standard: Implemented in accordance with ASTM B444, GB/T 14976 and GB50184-2011;
2. Parameters: Test pressure = 1.5×design pressure (conventional ≥42MPa), hold pressure for 10min, then reduce to design pressure and hold for 30min; 3. Water Quality: Clean water, chlorine ion content ≤25ppm, avoiding inner wall corrosion; 4. Requirement: 100% full-tube testing, no leakage, no deformation, no pressure drop is qualified; unqualified products are destroyed; 5. Report: Independent test records for each tube, batch summary report, applicable to project acceptance; 6. Optional: Helium leak testing and air tightness testing for high-pressure scenarios. |
| Fixed Length | 1. Regular Length: 2m, 3m, 4m, 6m, 12m (directly adapting to conventional heat exchangers);
2. Custom Length: Maximum length up to 20m, length tolerance ±0.4mm/m, ensuring consistent length for batch assembly; 3. Cutting Requirement: Flat cutting surface, no burrs, no inclination, verticality ≤0.1mm/m, avoiding affecting tube sheet installation; 4. Marking: Each tube is marked with clear length information, not easy to fall off, facilitating batch management. |
| Tube End Treatment & Standards | 1. Tube End Treatment: Regular treatment includes deburring and chamfering (30°~45°, length 1~2mm), smooth and burr-free, facilitating insertion and welding; customizable treatments include tube end expanding, reducing, threading, flange welding, etc., adapting to different installation methods; no deformation or cracks, dimensional accuracy consistent with the tube body.
2. Related Standards: International Standards (ASTM B444, ASME SB444, DIN 17752, ISO 6208); Testing Standards (ASTM E2439 for ET, ASTM A609 for Hydrostatic Testing, GB/T 12606); Industry Standards (GB50184-2011, API 5L); Quality System (ISO 9001 certification, ensuring batch stability). |
| Material Grade | 1. Main Grade: Inconel 625;
2. International Designations: UNS N06625 (American Standard), W.Nr. 2.4856 (German Standard), EN 2.4856 (European Standard); 3. Equivalent Grades: GB NS3306 (Chinese Standard), JIS NW6625 (Japanese Standard), ensuring international compatibility. |
| Chemical Composition (Weight %) | Nickel (Ni): 58.00 – 63.00; Chromium (Cr): 20.00 – 23.00; Molybdenum (Mo): 8.00 – 10.00; Niobium + Tantalum (Nb+Ta): 3.15 – 4.15; Iron (Fe): ≤5.00; Carbon (C): ≤0.05; Manganese (Mn): ≤0.50; Silicon (Si): ≤0.50; Phosphorus (P): ≤0.015; Sulfur (S): ≤0.015; Copper (Cu): ≤0.03; Titanium (Ti): ≤0.40; Aluminum (Al): ≤0.40. |
| Mechanical Properties (Annealed State) | Tensile Strength: ≥795 MPa; 0.2% Yield Strength: ≥345 MPa; Elongation (δ5): ≥30%; Reduction of Area (ψ): ≥50%; Hardness (HB): ≤220; Impact Toughness (Akv, Room Temperature): ≥100 J; High-Temperature Tensile Strength (650℃): ≥450 MPa; Low-Temperature Impact Toughness (-253℃): ≥60 J. |
| Dimensional Tolerance (Core Concern of Manufacturers) | Outer Diameter (OD): Precision Grade ±0.02mm, Ordinary Grade ±0.03mm (comply with ASTM B444), uniform deviation, no local protrusion/depression; Wall Thickness (WT): Precision Grade ±0.015mm, Ordinary Grade ±0.02mm, uniform thickness; Length Tolerance: Fixed Length ±0.4mm/m, Maximum Full-Length Tolerance ≤1.0mm (6m length); Roundness: ≤0.015mm (OD ≤50mm), ≤0.02mm (OD 50-100mm); Inner Diameter (ID): Tolerance ±0.02mm, uniform inner diameter, no blockage. |
| Supplementary Information (For Manufacturers) | 1. Material Traceability: Full traceability system from raw materials to finished products, complete records for query and verification;
2. Batch Stability: 100% inspection of each tube, uniform performance, avoiding differences affecting heat exchanger operation; 3. Packaging: Anti-corrosion, moisture-proof and anti-collision packaging, tube separation to avoid scratches during transportation; 4. Delivery: Short delivery cycle, support urgent orders, ensure heat exchanger production progress; 5. Technical Support: Provide welding parameters and installation guidance to solve manufacturer’s use problems; 6. Certifications & Reports: ISO 9001, ASTM/ASME certifications; MTR, ET, Hydrostatic Testing and other reports for project acceptance. |