Ti 6Al-4V ELI (Grade 23) is the extra-low interstitial version of the standard Ti 6Al-4V alloy. Produced through careful selection of ingot raw materials with reduced limits on iron, carbon, and oxygen, this high-purity alloy offers superior damage tolerance, enhanced fracture toughness, and better fatigue crack growth resistance compared to standard grade. Its excellent biocompatibility, good fatigue strength, and low modulus have made it the material of choice for surgical implants, dental devices, cryogenic vessels, and aerospace structural components.
1. Product Specifications & Physical DataTi 6Al-4V ELI is available in precision forms for medical, aerospace, and cryogenic applications requiring exceptional fracture toughness and fatigue performance. Available Forms: Round bar, flat bar, plate, sheet, wire, and custom components . Specifications: ASTM B348 Grade 23, ASTM F136 (medical implants), ISO 5832-3, UNS R56401, AMS 4907/4930 .
| Chemical Composition (Weight %) | Ti 6Al-4V ELI Specification |
|---|
| Aluminum (Al) | 5.50 - 6.50 | | Vanadium (V) | 3.50 - 4.50 | | Iron (Fe) | 0.25 max. | | Oxygen (O) | 0.13 max. | | Carbon (C) | 0.08 max. | | Nitrogen (N) | 0.05 max. | | Hydrogen (H) | 0.012 max. | | Titanium (Ti) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 4.43 g/cm³ | 0.160 lb/in³ | | Beta Transus | 980 - 1000°C | 1800 - 1830°F | | Modulus of Elasticity | 110 - 114 GPa | 16.0 - 16.5 × 10⁶ psi | | Poisson's Ratio | 0.31 - 0.34 | 0.31 - 0.34 | | Thermal Conductivity (RT) | 6.7 W/m·K | 46.5 BTU·in/hr·ft²·°F |
| Mechanical Properties (Annealed) | Metric | Imperial |
|---|
| Tensile Strength (min.) | 860 MPa | 125 ksi | | Yield Strength (0.2% offset, min.) | 795 MPa | 115 ksi | | Elongation (min.) | 10% | 10% | | Reduction of Area (min.) | 25% | 25% | | Fracture Toughness (K₁c) | 85 - 110 MPa√m | 77 - 100 ksi√in |
2. Fabrication & Material ComparisonAnnealing: 704-760°C (1300-1400°F) × 0.25-4 hours, furnace cool to 566°C (1050°F), then air cool . Solution Treatment: 904-954°C (1660-1750°F) × 2 hours, water quench . Aging: 538°C (1000°F) × 4 hours, air cool . Hot Forging: Rough forge at 982°C (1800°F), finish at 968°C (1750°F) . Cold Working: Similar to austenitic stainless steel; post-work annealing recommended to restore properties . Machining: Requires slow speeds, high feed rates, and adequate coolant flow; tungsten carbide (C1-C4) or cobalt-based tools recommended . Welding: Fair weldability; requires careful process control and inert gas shielding . Forming: Can be hot or cold formed using hydropress, stretch, or drop-hammer techniques .
| Material Comparison | Ti 6Al-4V ELI (Grade 23) | Ti 6Al-4V (Grade 5) | 316LVM Stainless | CoCrMo (ASTM F75) |
|---|
| Tensile Strength | 860 MPa | 930 MPa | 490 MPa | 655 MPa | | Yield Strength | 795 MPa | 860 MPa | 190 MPa | 450 MPa | | Fracture Toughness | 85-110 MPa√m | 70-90 MPa√m | 80-100 MPa√m | 50-70 MPa√m | | Modulus of Elasticity | 110 GPa | 110 GPa | 193 GPa | 210 GPa | | Oxygen Content | 0.13% max. | 0.20% max. | — | — | | Primary Use | Implants, cryogenic | Airframes, general | General implants | Joint replacements | | MRI Compatibility | Excellent | Excellent | Excellent | Moderate |
3. ApplicationsSurgical Implants: Orthopedic implants, bone plates, screws, spinal rods, hip stems, knee components (ASTM F136) Dental Implants: Dental roots, abutments, prosthetic components (ISO 5832-3) Aircraft Components: Structural parts, airframe components, fasteners Cryogenic Vessels: High-pressure vessels for liquid nitrogen, oxygen, and hydrogen service down to -269°C Salt Water Applications: Marine and offshore components requiring corrosion resistance Structural Components: Applications requiring excellent fracture toughness and fatigue strength
Contact ZYTC Alloy for certified Ti 6Al-4V ELI (UNS R56401 / Grade 23) materials with complete traceability, ASTM F136/ISO 5832-3 specifications, EN 10204 3.1/3.2 certificates, and competitive pricing. Available in round bar, flat bar, plate, sheet, and custom forms for medical, cryogenic, and aerospace applications. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
