Titanium Grade 7 (Ti-0.2Pd) bar for heat exchanger applications is the premium corrosion-resistant commercially pure titanium alloy, engineered with 0.12-0.25% palladium addition to deliver exceptional resistance to reducing acids, wet chlorine gas and crevice corrosion—environments where standard pure titanium grades fail rapidly. Specially designed for the most aggressive industrial heat transfer environments, it provides unmatched durability in chlor-alkali, sulfuric acid production, sour oil & gas and hydrometallurgical applications.
As the industry-standard titanium grade for severe corrosion service, Titanium Grade 7 bar offers identical mechanical properties and formability to Titanium Grade 2 while delivering 100-1000x better corrosion resistance in reducing acid environments. With over 20 years of production experience, Emily PIPE supplies precision-machined Titanium Grade 7 bars and fabricated heat exchanger components that meet the strictest international quality standards for mission-critical chemical processing projects.
| Item | Details |
|---|---|
| Executive Standards | 1. International Material Standards: ASTM B348 (Titanium and Titanium Alloy Bars and Billets), ASTM B337 (Seamless Titanium Tubes), ASTM B338 (Welded Titanium Tubes), ASME SB348, ASME SB337, ASME SB338
2. Corrosion Service Standards: NACE MR0175/ISO 15156, NACE MR0103 3. Heat Exchanger Specific Standards: TEMA (Tubular Exchanger Manufacturers Association) Standards Class R, HEI (Heat Exchange Institute) Standards 4. Regional Standards: DIN 3.7235, ISO 5832-6, JIS H4650, GB/T 3620 5. Testing Standards: ASTM E8 (Tensile), ASTM E23 (Impact), ASTM E10 (Hardness), ASTM E243 (Eddy Current Testing), ASTM A450 (Hydrostatic Testing) 6. Quality Management Standards: ISO 9001, ISO 14001, PED 2014/68/EU |
| Material Grade | 1. Main Grade: Titanium Grade 7 (Ti-0.2Pd, Palladium-Stabilized Commercially Pure Titanium, Severe Corrosion Heat Exchanger Grade)
2. International Designations: UNS R52400, ASTM Grade 7, DIN 3.7235, ISO TiPd 3. Equivalent Grades: TA9 (China), Grade 7 (USA), TiPd0.2 (Germany), fully compatible with all global heat exchanger manufacturing standards 4. Special Grades: Ultra-high purity grade for semiconductor applications; seamless tube grade for high-pressure chemical service; precision forged grade for heavy-duty components |
| Chemical Composition (Weight %) | 1. Titanium (Ti): 99.0% minimum (base element)
2. Palladium (Pd): 0.12 – 0.25 (key alloying element for reducing acid and crevice corrosion resistance) 3. Iron (Fe): ≤0.30 4. Oxygen (O): ≤0.25 5. Carbon (C): ≤0.08 6. Nitrogen (N): ≤0.03 7. Hydrogen (H): ≤0.015 8. Other Elements (each): ≤0.10 9. Other Elements (total): ≤0.40 Note: The precise palladium content is strictly controlled to ensure optimal corrosion resistance while maintaining cost-effectiveness |
| Mechanical Properties (Annealed State) | 1. Tensile Strength (Room Temperature): 345 – 515 MPa
2. 0.2% Yield Strength (Room Temperature): ≥275 MPa 3. Elongation (δ5): ≥20% (excellent formability identical to Grade 2) 4. Reduction of Area: ≥40% 5. Hardness (HB): ≤160 6. Modulus of Elasticity: 105 GPa 7. Thermal Conductivity: 16.0 W/m·K (at 20℃) 8. Thermal Expansion Coefficient: 8.6 × 10⁻⁶ /℃ (20-100℃) 9. Melting Point: 1668℃ 10. Maximum Continuous Service Temperature: 315℃ in oxidizing environments |
| Dimensional Tolerance (Heat Exchanger Precision Grade) | 1. Hot Rolled Bars:
– Diameter 6mm – 50mm: ±0.3mm – Diameter 50mm – 150mm: ±0.5mm – Diameter 150mm – 300mm: ±0.8mm 2. Cold Drawn Bars: – Diameter 6mm – 30mm: ±0.03mm – Diameter 30mm – 80mm: ±0.05mm – Diameter 80mm – 150mm: ±0.10mm 3. Precision Ground Bars: – Diameter 6mm – 100mm: ±0.01mm 4. Rectangular/Square Bars: – Width/Thickness: ±0.05mm for dimensions ≤50mm; ±0.10mm for dimensions >50mm |
| Heat Exchanger Operating Conditions (Detailed) | 1. Temperature Range:
– Continuous service temperature: -253℃ to 315℃ (oxidizing environments) – Intermittent service temperature: up to 425℃ – Cryogenic service: Maintains excellent ductility down to absolute zero, ideal for cryogenic chemical processing 2. Pressure Range: – Design pressure: up to 160 bar (2320 psi) for seamless tubes (identical to Grade 2) – Design pressure: up to 100 bar (1450 psi) for welded tubes – Pressure vessel grade: Fully compliant with ASME Section VIII Div. 1 for pressure-containing components 3. Compatible Media (Unique to Grade 7): – Reducing Acids: Hydrochloric acid (up to 10% concentration at boiling point), sulfuric acid (up to 50% concentration at 100℃), phosphoric acid (all concentrations up to boiling point) – Wet Chlorine Gas: Safe for continuous service in wet chlorine environments where standard titanium would ignite – Chloride Solutions: Complete immunity to pitting and crevice corrosion in chloride solutions up to 200℃ – Sour Crude Oil: Excellent resistance to H₂S and CO₂ corrosion up to 1500 ppm H₂S – Organic Acids: All concentrations and temperatures of acetic, formic, citric and lactic acids – Bleach Solutions: Sodium hypochlorite and chlorine dioxide solutions at all concentrations 4. Industry-Specific Operating Conditions: – Chlor-Alkali Industry: Operating temperature 60-150℃, pressure 1-16 bar, wet chlorine gas and brine solutions – Sulfuric Acid Production: Operating temperature 80-200℃, pressure 1-10 bar, sulfuric acid solutions (20-98%) – Sour Oil & Gas Production: Operating temperature up to 180℃, pressure up to 120 bar, high H₂S/CO₂ produced water – Hydrometallurgy: Operating temperature 60-180℃, pressure 1-20 bar, acidic leach solutions containing chlorides – Semiconductor Manufacturing: Operating temperature 20-150℃, pressure 1-10 bar, high-purity chemical solutions |
| Heat Exchanger Tube Bundle Types (Detailed) | 1. U-Bend Tubes:
– Description: Tubes bent into U-shape with uniform bend radius, allowing for thermal expansion without additional expansion joints. Grade 7’s excellent formability and crevice corrosion resistance make it ideal for U-bend applications in aggressive environments – Bend Radius Options: 1.5×OD, 2×OD, 3×OD, 4×OD and custom radii – Wall Thickness Range: 0.7mm – 6.0mm – Outer Diameter Range: 6mm – 60mm – Applications: Chlor-alkali heat exchangers, sulfuric acid coolers, sour gas heat exchangers, hydrometallurgical evaporators – Advantages: Excellent thermal expansion compensation, easy replacement, no crevice corrosion at tube bends, 50% lower cost than Hastelloy alloys – Quality Control: 100% visual and dimensional inspection after bending; no cracking, wall thinning >8% or ovality >4% allowed; stress relief annealing available upon request 2. Condenser Tubes: – Description: Straight seamless tubes with precise dimensional tolerances for condenser applications in aggressive chemical environments. Grade 7 is the only titanium grade suitable for wet chlorine gas condensers – Outer Diameter Range: 10mm – 50mm (most common: 19.05mm, 25.4mm, 31.75mm) – Wall Thickness Range: 0.8mm – 3.0mm (most common: 1.24mm, 1.65mm, 2.11mm) – Length Range: Up to 24 meters – Applications: Wet chlorine gas condensers, sulfuric acid condensers, sour gas condensers, brine coolers – Advantages: High thermal efficiency, low fouling, long service life, no ignition risk in wet chlorine environments – Quality Control: 100% eddy current and hydrostatic testing; strict control of ovality ≤3% and wall thickness variation ≤7% 3. Evaporator Tubes: – Description: Tubes with enhanced surface finishes or internal/external fins for improved heat transfer. Grade 7’s excellent corrosion resistance allows for extended service life in evaporative applications – Surface Options: Smooth, corrugated, low-fin (19-26 fins per inch) – Fin Height: 0.5mm – 2.0mm – Applications: Falling film evaporators, forced circulation evaporators, brine evaporators, acid concentrators – Advantages: Increased heat transfer area by 2-4 times, higher efficiency, compact design, no crevice corrosion 4. Straight Tubes: – Description: Straight seamless tubes for fixed tube sheet heat exchangers. Grade 7’s excellent corrosion resistance eliminates the need for corrosion inhibitors – Length Range: Up to 12 meters (standard); up to 24 meters (custom) – Applications: Fixed tube sheet heat exchangers, coolers, heaters, process exchangers – Advantages: Lower cost, easier mechanical cleaning, no crevice corrosion at tube sheet joints 5. Coiled Tubes: – Description: Tubes coiled into helical or spiral shapes for compact heat exchangers in chemical processing applications – Coil Diameter Range: 100mm – 6000mm – Applications: Compact chemical heat exchangers, immersion heaters, waste heat recovery units, acid coolers – Advantages: High heat transfer efficiency (2-3 times higher than shell and tube), compact design, excellent thermal shock resistance |
| Surface Quality (Detailed) | 1. Standard Surface Finishes:
– Pickled and Passivated (Standard): Acid pickled to remove scale and oxides, then passivated to form a protective palladium-enhanced titanium oxide layer. Surface roughness Ra ≤ 3.2μm. Suitable for most chemical processing applications. – Mechanically Polished: Polished to surface roughness Ra ≤ 0.8μm using abrasive belts. Reduces fouling by 30-50% and improves cleanability. Ideal for pharmaceutical and high-purity applications. – Electropolished: Ultra-smooth surface with Ra ≤ 0.2μm achieved through electrochemical process. Maximum corrosion resistance and minimum fouling. Used in critical semiconductor and pharmaceutical applications. – Sand Blasted: Uniform matte finish with Ra ≤ 6.3μm using aluminum oxide media. Improves coating adhesion for specialized applications. 2. Surface Defect Control Standards (Severe Corrosion Grade): – No cracks, laps, seams, inclusions, laminations or other harmful defects allowed on the entire surface – Minor scratches: depth ≤ 3% of nominal wall thickness, length ≤ 30mm, no more than 1 per 2 meters – Minor dents: depth ≤ 2% of nominal wall thickness, diameter ≤ 3mm, no more than 1 per 2 meters – Surface oxidation: no heavy oxidation, discoloration or scale allowed 3. Cleanliness Requirements (Severe Corrosion Grade): – All tubes are thoroughly cleaned inside and out using alkaline, ultrasonic and high-pressure water jet cleaning to remove oil, grease, dirt and machining residues – Residual oil content: ≤ 10mg/m² for standard grade; ≤ 2mg/m² for high-purity grade – No foreign particles, debris or moisture allowed inside the tubes – Cleaned tubes are immediately capped and sealed with heavy-duty polyethylene caps with internal sealing rings to prevent contamination during transportation |
| Straightness (Detailed) | 1. Straightness Tolerance Standards (Severe Corrosion Grade):
– Standard Grade: ≤ 0.8mm per meter length – Precision Grade: ≤ 0.4mm per meter length – Ultra-Precision Grade: ≤ 0.15mm per meter length – Maximum total straightness deviation: ≤ 2.5mm for tubes up to 6 meters long; ≤ 4mm for tubes up to 12 meters long; ≤ 8mm for tubes up to 24 meters long 2. Measurement Method: – Straightness is measured using a laser straightness gauge with ±0.005mm accuracy along the entire length of the tube – Measurements are taken at 8 points 45° apart around the circumference to ensure accuracy – All measurements are performed at room temperature (20±5℃) to eliminate thermal expansion effects 3. Production Control Measures: – Multiple straightening operations during production: hot straightening after rolling, cold straightening after annealing – Final precision straightening using CNC multi-roll straightening machines with closed-loop feedback – 100% straightness inspection for all severe corrosion service heat exchanger tubes – Tubes that do not meet straightness requirements are re-straightened or rejected |
| Eddy Current Testing (ET) (Detailed) | 1. Executive Standards:
– ASTM E243: Standard practice for electromagnetic (eddy current) examination of seamless and welded nonferrous tubes – ASTM E309: Standard practice for electromagnetic (eddy current) examination of steel tubular products – TEMA RCB-7.4: Eddy current testing requirements for heat exchanger tubes – NACE TM0102: Additional requirements for sour service applications 2. Testing Equipment: – Multi-frequency eddy current testing machines with 16-32 channels – Automatic data acquisition and recording system with 3D defect imaging capability – Calibration standards with artificial defects (longitudinal notches, transverse notches, flat-bottom holes) of specified sizes 3. Testing Parameters (Severe Corrosion Grade): – Testing frequency: 20kHz – 300kHz (selected based on tube diameter, wall thickness and material grade) – Inspection speed: 0.3m/s – 1.5m/s (slower than standard grades for higher sensitivity) – Sensitivity: calibrated to detect defects as small as 2.5% of nominal wall thickness – Phase angle: adjusted to maximize sensitivity to surface and subsurface defects 4. Defect Detection Capability: – Longitudinal and circumferential cracks (depth ≥2.5% wall thickness) – Pitting and corrosion defects (diameter ≥0.3mm, depth ≥2.5% wall thickness) – Wall thickness variations (≥±6% of nominal) – Inclusions and laminations (area ≥0.5mm²) – Weld defects (for welded tubes: porosity, lack of fusion, cracks) 5. Acceptance Criteria: – No defects that produce a signal equal to or greater than the calibration standard signal are allowed – Minor signals below the calibration threshold are evaluated based on size, location and type – All defective tubes are marked with fluorescent paint and segregated for rework or rejection 6. Documentation: – 100% of tubes are tested and documented – Each shipment includes an eddy current test report with calibration records, test parameters, individual tube results and defect maps |
| Hydrostatic Testing (Detailed) | 1. Executive Standards:
– ASTM A450: Standard specification for general requirements for carbon, low-alloy, and alloy steel tubes – ASME B31.3: Process piping code – TEMA RCB-7.3: Hydrostatic testing requirements for heat exchanger tubes – NACE MR0175: Additional requirements for sour service applications 2. Test Pressure Calculation (Severe Corrosion Grade): – Test pressure = 1.5 × design pressure – Minimum test pressure: 15 bar (218 psi) – Maximum test pressure: limited by the yield strength of the material (not exceeding 80% of yield strength) – For Grade 7 tubes, typical test pressures range from 20 bar to 120 bar depending on wall thickness and diameter 3. Test Procedure: – Tubes are filled with demineralized, deionized water (chloride content <1 ppm) at ambient temperature (10-30℃) to prevent chloride-induced corrosion – Air is completely vented from the system to prevent false pressure readings – Pressure is gradually increased to the specified test pressure at a rate of ≤5 bar/s – Pressure is held for a minimum of 15 seconds per meter of tube length, but not less than 30 seconds – Tubes are visually inspected for leaks, bulging or deformation during the holding period 4. Acceptance Criteria: – No leakage through the tube wall or at the end closures – No permanent deformation, bulging or wrinkling of the tube – No pressure drop during the holding period 5. Post-Test Processing: – Tubes are thoroughly drained of water after testing – Tubes are dried with heated filtered compressed air (dew point ≤-60℃) to prevent water spots and corrosion – Tubes are immediately capped and sealed after drying 6. Documentation: – Each shipment includes a hydrostatic test report with test pressure, holding time, test medium purity and individual tube results |
| Fixed Length | 1. Standard Fixed Lengths:
– 1000mm, 2000mm, 3000mm, 4000mm, 5000mm, 6000mm – Most common for severe corrosion heat exchangers: 3000mm, 4000mm, 6000mm 2. Custom Lengths: – Any length from 100mm to 12000mm available upon request – Special lengths up to 24000mm available for large-scale chemical processing heat exchangers 3. Length Tolerance: – Standard tolerance: ±2mm for lengths up to 6000mm – Precision tolerance: ±0.5mm for lengths up to 6000mm – Tolerance for lengths over 6000mm: ±4mm 4. Cutting Services: – Precision cutting to exact customer specifications using CNC band saws and circular saws – Cutting accuracy: ±0.3mm for lengths up to 6000mm – All cut ends are deburred and chamfered to remove sharp edges and burrs |
| Tube End Processing Standards (Detailed) | 1. Plain End (Standard):
– Description: Square cut end with no additional machining – End Squareness: ≤ 0.3mm for tubes up to 50mm OD; ≤0.7mm for tubes 50-100mm OD – Burr Removal: All burrs are removed from both inside and outside edges using chamfering tools – Applications: General-purpose chemical heat exchangers, welded tube sheet connections, butt welding 2. Chamfered End: – Description: Precision beveled end for welding or tube sheet expansion – Standard Chamfer Angles: 30°, 37.5°, 45°, 60° – Chamfer Depth: 1-6mm depending on wall thickness (typically 1/3 of wall thickness) – Root Face: 0.5-2.5mm as specified by customer – Applications: Welded tube sheet connections, butt welding, high-pressure chemical applications 3. Threaded End: – Description: Precision machined threads on the tube end for high-pressure connections – Thread Standards: NPT, BSPT, BSPP, metric threads (M6-M80), UN/UNF threads – Thread Tolerance: Class 2A for external threads; Class 2B for internal threads – Thread Length: 10-70mm depending on tube diameter and thread standard – Applications: High-pressure instrumentation connections, small-bore chemical heat exchangers, hydraulic systems 4. Flared End: – Description: Expanded end for high-pressure flared tube connections – Flare Angles: 37° (JIC), 45° (SAE), 90° – Flare Diameter: 1.2-1.8×OD depending on flare angle – Flare Thickness: ≥85% of original wall thickness – Applications: High-pressure hydraulic and pneumatic connections, chemical processing instrumentation lines 5. Swaged End: – Description: Reduced or expanded diameter end for high-pressure fitting connections – Reduction/Expansion Ratio: Up to 35% of original diameter – Transition Length: 3-6× diameter change – Wall Thickness Variation: ≤±7% of nominal – Applications: Tube-to-tube connections, manifold assemblies, chemical heat exchanger headers 6. Tube End Protection: – All tube ends are protected with heavy-duty polyethylene caps with internal sealing rings during transportation – Metal caps with rubber seals available for large diameter tubes and international shipping – Protective caps are removed only at the time of installation to prevent contamination |
| Why Choose Us (Emily PIPE) | 1. 20+ Years of Palladium-Stabilized Titanium Expertise: We have been manufacturing and supplying Titanium Grade 7 heat exchanger components to global chemical processing markets for over 20 years, with deep specialization in precise palladium content control for optimal corrosion resistance.
2. 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 severe corrosion service tubes. 3. Advanced Production Equipment: Our production facilities are equipped with state-of-the-art titanium processing equipment, including precision rolling mills, CNC bending machines, and vacuum annealing furnaces specifically designed for Grade 7 titanium. 4. Complete Certification: Our products meet all major international standards and hold certifications including ASTM, ASME, NACE MR0175, PED and ISO 9001, ensuring compliance with the strictest global chemical project requirements. 5. Advanced Customization Capability: We can produce custom sizes, lengths, tempers, surface finishes and tube end processing according to your drawings and technical specifications, including complex U-bend and coiled tube bundles. 6. One-Stop Solution: We provide complete heat exchanger solutions from material selection and component manufacturing to assembly and pressure testing, reducing your supply chain complexity and costs. 7. Global Logistics Support: We have extensive experience in international shipping for chemical projects and can arrange door-to-door delivery to your facility anywhere in the world with reliable lead times and specialized packaging. 8. Professional Technical Support: Our team of metallurgical engineers and corrosion specialists provides expert guidance on material selection, design optimization and troubleshooting for severe corrosion applications. |
| Inquiry Guidance Words | 1. If you need high-quality Titanium Grade 7 bars or severe corrosion service heat exchanger tubes for your chlor-alkali, sulfuric acid, sour oil & gas or hydrometallurgical project, please send us your specific requirements including dimensions (outer diameter, wall thickness, length), quantity, design pressure, operating temperature, corrosion media and concentration, required standards, surface finish, tube end processing and delivery date, and we will provide a detailed quotation within 12 hours.
2. For any questions about material properties, corrosion resistance in specific chemical environments, testing requirements or heat exchanger design, our titanium corrosion specialists are available to assist you promptly. 3. Emily PIPE is your trusted partner for high-performance severe corrosion titanium heat exchanger solutions. Contact us today to discuss how our Grade 7 titanium products can help you improve the efficiency, reliability and service life of your most critical chemical processing equipment. |
| Supplementary Industry Information | 1. Comprehensive Test Reports: Each batch comes with a full Material Test Report (MTR) including chemical composition analysis (with verified palladium content), mechanical properties testing, heat treatment records, eddy current test results and hydrostatic test results.
2. Full Material Traceability: Every product comes with a unique heat number and complete traceability documentation from raw material ore to finished product, meeting the strictest industrial requirements for chemical processing applications. 3. Value-Added Processing: We offer comprehensive value-added services including precision cutting, CNC machining, bending, welding, tube end processing and assembly, providing ready-to-install heat exchanger components. 4. Specialized Packaging: We use protective packaging designed for severe corrosion service titanium products, including plastic end caps with sealing rings, anti-corrosion wrapping and wooden crates with steel reinforcement to prevent damage during transportation. 5. Prototype Development Support: We support small batch prototype orders with fast turnaround times to help you accelerate product development and testing for new chemical processing projects. 6. Mass Production Capability: We have the capacity to produce thousands of tons of Titanium Grade 7 heat exchanger components per year to support large-scale chemical and oil & gas projects. 7. Market Growth: The global Titanium Grade 7 heat exchanger market is projected to grow at a CAGR of over 12% through 2030, driven by increasing demand from chlor-alkali production, lithium battery recycling and sour oil & gas exploration. 8. Cost Advantage: Titanium Grade 7 offers comparable corrosion resistance to Hastelloy C276 in many reducing acid environments at 50-60% lower material cost, making it the most cost-effective solution for severe corrosion heat exchanger applications. 9. Sustainability Advantage: Titanium is 100% recyclable and has a much longer service life than conventional materials, making it the most sustainable choice for heat exchanger applications with the lowest total lifecycle cost. |