Inconel 625 Heat Exchanger Bar

2. Heat Exchanger Specific Standards: ASME SB-444, TEMA (Tubular Exchanger Manufacturers Association) standards

3. Quality System Certification: ISO 9001, ISO 14001, OHSAS 18001

4. Testing Standards: ASTM E8 (Tensile), ASTM E23 (Impact), ASTM G48 (Corrosion), ASTM E2439 (Eddy Current), ASTM A450 (Hydrostatic)

2. International Designations: UNS N06625, W.Nr. 2.4856, EN 2.4856

3. Equivalent Grades: GB NS3306, JIS NW6625, fully compatible with all global heat exchanger manufacturing standards

2. Chromium (Cr): 20.00 – 23.00

3. Molybdenum (Mo): 8.00 – 10.00

4. Niobium + Tantalum (Nb+Ta): 3.15 – 4.15

5. Iron (Fe): 5.00 maximum

6. Carbon (C): 0.05 maximum

7. Manganese (Mn): 0.50 maximum

8. Silicon (Si): 0.50 maximum

9. Phosphorus (P): 0.015 maximum

10. Sulfur (S): 0.015 maximum

11. Copper (Cu): 0.03 maximum

12. Titanium (Ti): 0.40 maximum

13. Aluminum (Al): 0.40 maximum

2. 0.2% Yield Strength: ≥345 MPa

3. Elongation (δ5): ≥30%

4. Reduction of Area (ψ): ≥50%

5. Hardness (HB): 150 – 220

6. High-Temperature Tensile Strength (650℃): ≥450 MPa

7. Fatigue Strength (10⁷ Cycles): ≥310 MPa

8. Corrosion Rate: ≤0.01mm/year in 3.5% NaCl solution

9. Stress Corrosion Cracking Resistance: No failure after 1000 hours in boiling 45% MgCl₂ solution

2. Length Tolerance: Fixed Length (1m-6m): ±0.2mm/m; Maximum Full-Length Tolerance: ≤0.8mm; Custom Length up to 18m available

3. Roundness: ≤0.01mm (≤50mm); ≤0.015mm (50-100mm); ≤0.02mm (100-200mm)

4. Wall Thickness Uniformity (for finished tubes): ≤±0.015mm

5. Surface Finish: Ra ≤0.8μm standard, optional polished finish Ra ≤0.4μm

1. Chemical Processing Industry: Operates reliably in temperatures from -253℃ to 760℃ and pressures up to 200 bar, resistant to 98% sulfuric acid, hydrochloric acid, nitric acid, caustic soda and other aggressive chemical media. Ideal for heat exchangers used in fertilizer production, pharmaceutical manufacturing and fine chemical processing

2. Oil & Gas Industry: Withstands sour gas environments containing H₂S and CO₂, as well as high-salt brine solutions. Suitable for offshore platform heat exchangers, refinery crude oil heaters and natural gas processing equipment

3. Marine & Offshore Industry: Resists long-term seawater immersion and salt spray corrosion, making it perfect for shipboard heat exchangers, seawater desalination plants and offshore wind turbine cooling systems

4. Power Generation Industry: Maintains stable performance in high-temperature steam up to 650℃, used in power plant condensers, boiler heat exchangers and waste heat recovery systems

5. Food & Beverage Industry: Meets food-grade requirements, resistant to cleaning agents and food products. Used in pasteurizers, sterilizers and food processing heat exchangers

6. Pharmaceutical Industry: Provides hygienic surfaces and excellent corrosion resistance, suitable for sterile heat exchange equipment and bioreactor cooling systems

7. Continuous Operation: Designed for 24/7 uninterrupted service for 20+ years, with no performance degradation or corrosion-related failures, minimizing downtime and production losses

1. Straight Heat Exchanger Tubes: The most common form, used in shell-and-tube heat exchangers. Inconel 625 straight tubes feature uniform wall thickness, high dimensional accuracy and excellent corrosion resistance, ensuring efficient heat transfer and long service life. Available in diameters from 6mm to 114mm and lengths up to 18m

2. U Bend Tubes: Critical components of U-tube heat exchangers, widely used in high-pressure and high-temperature applications. Inconel 625 U bend tubes can be formed with bend radii from 1.5D to 10D without cracking or significant wall thinning (≤4% thinning). After bending, they undergo full non-destructive testing to ensure integrity. Ideal for applications requiring thermal expansion compensation

3. Condenser Tubes: Specifically designed for power plant condensers, shipboard condensers and industrial refrigeration systems. Inconel 625 condenser tubes have smooth inner surfaces that reduce fouling and improve heat transfer efficiency by up to 15% compared to copper tubes. They are resistant to erosion-corrosion caused by high-velocity seawater flow

4. Evaporator Tubes: Used in industrial evaporators and desalination plants. Inconel 625 evaporator tubes resist scaling and corrosion from brine solutions, ensuring consistent performance over long periods

5. Complete Tube Bundles: We provide custom tube bundle assembly services, including precision tube cutting, bending, end finishing and bundle assembly. Our tube bundles are designed to exact customer specifications and undergo comprehensive testing before delivery, ensuring perfect fit with heat exchanger shells and tube sheets

6. Quality Assurance: All tubes and tube bundles undergo 100% hydrostatic testing, eddy current testing and dimensional inspection, meeting TEMA and ASME standards for heat exchanger manufacturing

1. Standard Surface Treatment: All bars are supplied in the annealed and pickled condition, which removes oxide scale and produces a uniform, corrosion-resistant passive film. This treatment ensures optimal corrosion resistance in most industrial applications

2. Optional Surface Treatments:

– Passivation: Enhances the natural passive film, providing additional corrosion protection

– Electropolishing: Produces a smooth, mirror-like surface with Ra ≤0.2μm, ideal for food, pharmaceutical and sanitary applications where hygiene is critical

– Mechanical Polishing: Available in various grades from Ra 0.8μm to Ra 0.05μm, reducing fouling and improving heat transfer efficiency

– Shot Blasting: Creates a uniform matte surface, improving paint adhesion for coated applications

3. Defect Control Standards: All bars are 100% visually inspected by trained technicians. Surface defects including scratches, pits, cracks, inclusions and seams are strictly controlled. Any defect deeper than 0.03mm is rejected or reworked to meet quality standards

4. Surface Cleanliness: After processing, all bars are thoroughly cleaned to remove oil, grease and debris. They are then wrapped in protective film to prevent contamination during transportation and storage

5. Special Requirements: We can provide custom surface treatments and quality standards according to customer specifications, including passivation in accordance with ASTM A967 and electropolishing to meet FDA food-grade requirements

1. Standard Straightness Guarantee: Our standard heat exchanger grade Inconel 625 bar has a straightness of ≤0.15mm/m, with a maximum full-length straightness error of ≤0.4mm for 6m long bars. This is significantly better than the industry standard of ≤0.3mm/m

2. Precision Straightening Process: All bars undergo multi-pass precision straightening using state-of-the-art CNC hydraulic straightening machines. The straightening process is computer-controlled to ensure consistent accuracy and avoid introducing internal stresses that could lead to deformation during subsequent processing

3. Advanced Straightness Inspection: Each bar is individually inspected for straightness using high-precision laser straightness measuring equipment. The inspection results are recorded and included in the material test report for full traceability

4. Custom Straightness Options: For high-precision applications such as nuclear power plant heat exchangers and pharmaceutical processing equipment, we can provide bars with straightness as low as ≤0.1mm/m upon request

5. Importance for Heat Exchangers: Excellent straightness ensures that tubes can be easily inserted into heat exchanger tube sheets without forcing, which prevents damage to the tubes and tube sheets. It also ensures uniform spacing between tubes, maximizing heat transfer efficiency and reducing flow-induced vibration that can cause premature tube failure

1. Testing Standards: All eddy current testing is performed in strict accordance with ASTM E2439, ASME V and TEMA standards. The testing equipment is calibrated daily using standard reference blocks with artificial defects of known size and depth

2. 100% Full Coverage Inspection: Every inch of the bar surface is inspected, including the entire length, ends and transition areas. The testing is performed at a controlled speed of 0.5-1.5m/s to ensure thorough inspection and accurate defect detection

3. Detection Capability: Our advanced eddy current testing equipment can detect surface and near-surface defects as small as 0.08mm in depth, including cracks, pits, inclusions, seams, laps and wall thickness variations. It can also detect changes in material properties that could affect performance

4. Testing Process: Each bar passes through a multi-coil eddy current array, which generates a magnetic field and detects changes in electrical conductivity caused by defects. Any detected defect is automatically marked on the bar with paint, and its location and size are recorded in the test report

5. Acceptance Criteria: Only bars with no detectable defects exceeding the acceptance level are approved for delivery. Any bar with defects exceeding the specified limits is rejected and destroyed to prevent it from entering the supply chain

6. Documentation: A detailed eddy current test report is provided for each batch of bars, including test parameters, calibration records, defect locations and acceptance criteria. All test records are retained for a minimum of 15 years for full traceability

7. Significance: Eddy current testing ensures that only defect-free material is used in heat exchanger manufacturing, preventing costly leaks, equipment failures and potential environmental damage

1. Hydrostatic Testing Standards: Performed in accordance with ASTM B444, ASME B31.3 and TEMA standards. The test pressure is calculated as 1.5 times the design working pressure, with a minimum test pressure of 42MPa (6000psi) for all heat exchanger grade material

2. Testing Procedure: Each bar or finished tube is filled with clean, deionized water with a chloride content of ≤25ppm to prevent corrosion. The pressure is gradually increased to the specified test pressure and held for a minimum of 15 minutes. During this time, the bar is carefully inspected for leaks, bulges, deformation or pressure drop

3. Acceptance Criteria: A bar passes hydrostatic testing only if there is no leakage, no visible deformation and no pressure drop during the entire holding period. Any bar that fails the test is immediately rejected and destroyed

4. Precision Fixed Length Cutting: We use CNC automatic saws to cut bars to exact customer specifications. Standard fixed lengths include 2m, 3m, 4m, 6m, 9m and 12m. Custom lengths from 0.5m to 18m are available upon request

5. Length Tolerance Guarantee: Fixed length tolerance is ±0.2mm/m, with a maximum full-length tolerance of ≤0.8mm for 6m long bars. This ensures that all tubes in a heat exchanger bundle are the same length, facilitating easy assembly and alignment

6. End Preparation After Cutting: After cutting, the ends are automatically deburred to remove sharp edges and burrs. The cut ends are flat and perpendicular to the bar axis, with a squareness tolerance of ≤0.1mm/m, ensuring proper fit during tube-to-tube sheet joining

7. Special Testing Options: For high-pressure applications, we can perform hydrostatic testing at pressures up to 100MPa, as well as helium leak testing for ultra-high integrity requirements

1. Standard Chamfering: The most common tube end treatment for heat exchanger tubes. We provide 30°-45° chamfers with a 1-2mm flat land, in accordance with ASME B16.25 standards. This treatment facilitates easy insertion into tube sheet holes and prevents damage to the tube sheet during assembly

2. Square Cut Ends: Used for butt welding applications. The ends are cut square and deburred, with a squareness tolerance of ≤0.1mm/m. The end face is machined to ensure a flat, uniform surface for high-quality welding

3. Expanded Ends: Used for tube-to-tube sheet expansion joints. The ends are expanded to a specified diameter using hydraulic or mechanical expanders, with expansion tolerances of ±0.02mm. This creates a tight, leak-proof mechanical bond between the tube and tube sheet

4. Reduced Ends (Swaged Ends): Used for connecting tubes of different diameters. The ends are swaged or machined to a smaller diameter with a smooth, gradual transition to avoid stress concentration. Available in both concentric and eccentric configurations

5. Threaded Ends: Used for threaded connections. Threads are cut in accordance with NPT, BSPT, BSPP or ISO standards, with thread tolerances of 2A/2B. The threads are deburred and coated with anti-seize compound to prevent galling during assembly

6. Flanged Ends: Used for bolted connections. Flanges are welded to the tube ends in accordance with ASME B16.5 standards. All welds are 100% inspected using ultrasonic testing to ensure integrity

7. Grooved Ends: Used for mechanical coupling connections. Grooves are machined to exact specifications, ensuring proper fit with standard mechanical couplings

8. Custom End Treatments: We can provide custom tube end treatments according to customer drawings and specifications, including beveling, counterboring, threading and special machining operations

2. Complete International Certifications: Our products hold ASTM, ASME, ISO and TEMA certifications, ensuring compliance with all global heat exchanger manufacturing standards

3. Heat Exchanger-Specific Quality Control: We implement a dedicated quality control process for heat exchanger materials, including 100% non-destructive testing and corrosion resistance verification

4. Full Material Traceability: Every bar comes with a unique heat number and complete traceability documentation from raw material to finished product, meeting the strictest project requirements

5. Advanced Customization Capability: We can produce custom sizes, lengths, surface finishes and tube end treatments according to your drawings and technical specifications, with lead times as short as 10 days

6. Professional Technical Support: Our team of metallurgical engineers provides expert material selection guidance, welding parameters and machining recommendations for heat exchanger applications

7. Global One-Stop Service: We handle everything from material selection and production to international shipping and customs clearance, with reliable logistics partners ensuring on-time delivery to any location worldwide

2. For any questions about material properties, non-destructive testing, tube end treatments or heat exchanger application guidance, our industry specialists are available to assist you promptly

3. Emily PIPE is your trusted partner for high-performance heat exchanger alloy materials. Contact us today to discuss how we can support your next project with reliable, cost-effective solutions

2. Professional Packaging: We use anti-corrosion wrapping, wooden crates and steel strapping to protect products during long-distance transportation, with clear identification and traceability labels

3. Urgent Order Support: We maintain a large inventory of standard Inconel 625 bar sizes, enabling us to fulfill urgent orders within 5-7 days

4. Small Batch Production: We support small batch orders for prototype development, equipment repairs and spare parts, with no minimum order quantity for standard sizes

5. After-Sales Service: We provide lifetime technical support for all our products, including on-site assistance for material-related issues and replacement parts for warranty claims

6. Sustainability: All our products are 100% recyclable, and we are committed to reducing our environmental impact through sustainable manufacturing practices