Grade 23 Titanium Alloy | Ti-6Al-4V ELI | UNS R56401 | ASTM F136 / ASTM B348 Supplier
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
1. Grade 23 Titanium Alloy (Ti-6Al-4V ELI) Overview
Grade 23 Titanium Alloy, also known as Ti-6Al-4V ELI (Extra Low Interstitial), is a high-purity version of Grade 5 titanium alloy, engineered to deliver superior fracture toughness, fatigue resistance, and biocompatibility.
By strictly controlling interstitial elements such as oxygen, nitrogen, carbon, and hydrogen, Grade 23 achieves exceptional ductility and damage tolerance, making it the preferred titanium alloy for medical implants, aerospace critical structures, and high-reliability engineering components.
Compared with standard Ti-6Al-4V (Grade 5), Grade 23 offers:
Higher toughness and elongation
Improved fatigue and crack resistance
Superior consistency for critical applications
Full compliance with medical and aerospace standards
As a professional Grade 23 Titanium Alloy supplier, Huaxiao-Alloy provides UNS R56401 Ti-6Al-4V ELI in bar, rod, wire, sheet, plate, tube, and forged forms, with full traceability and global export support.
2. Equivalent Standards & International Designations
Grade 23 titanium alloy is globally standardized, especially for implantable and safety-critical components.
| Standard System | Designation |
|---|---|
| ASTM | Grade 23 (Ti-6Al-4V ELI) |
| ASTM Medical | ASTM F136 |
| UNS | R56401 |
| ISO | ISO 5832-3 (ELI) |
| AMS | AMS 4930 / AMS 4931 |
| DIN / EN | 3.7165 (ELI equivalent) |
| JIS | Ti-6Al-4V ELI |
| GB (China) | TC4 ELI |
➡️ These standards ensure Grade 23 is accepted worldwide in medical, aerospace, and high-end engineering projects.
3. Chemical Composition of Grade 23 Titanium Alloy
The defining feature of Grade 23 is extra-low interstitial content, which directly improves toughness and fatigue life.
| Element | Content (%) |
|---|---|
| Titanium (Ti) | Balance |
| Aluminum (Al) | 5.5 – 6.5 |
| Vanadium (V) | 3.5 – 4.5 |
| Oxygen (O) | ≤ 0.13 |
| Nitrogen (N) | ≤ 0.03 |
| Carbon (C) | ≤ 0.08 |
| Hydrogen (H) | ≤ 0.012 |
| Iron (Fe) | ≤ 0.25 |
Composition Insight
Lower oxygen = higher ductility & fracture toughness
Maintains high strength while reducing brittleness
Ideal for cyclic load and human-body applications
4. Mechanical Properties of Ti-6Al-4V ELI (Grade 23)
4.1 Mechanical Properties at Room Temperature (Annealed)
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 860 MPa |
| Yield Strength (0.2%) | ≥ 795 MPa |
| Elongation | ≥ 10 – 14% |
| Reduction of Area | ≥ 25% |
| Hardness | ~ 34 HRC |
| Density | 4.43 g/cm³ |
| Elastic Modulus | ~110 GPa |
4.2 Performance Characteristics
Exceptional fatigue resistance
Superior fracture toughness
Stable mechanical performance across batches
Trusted for life-critical components
5. Key Advantages of Grade 23 Titanium Alloy
5.1 Superior Biocompatibility
Non-toxic and non-allergenic
Excellent osseointegration
No adverse tissue reactions
Fully compliant with ASTM F136
➡️ This makes Grade 23 the gold standard for medical implants.
5.2 Outstanding Fatigue & Fracture Resistance
Designed for cyclic loading
High crack-growth resistance
Reliable under long-term service
5.3 High Strength-to-Weight Ratio
Strength comparable to high-strength steels
40% lighter than steel
Ideal for aerospace & performance engineering
5.4 Excellent Corrosion Resistance
Resistant to body fluids
Resistant to seawater and chloride environments
Excellent passivation behavior
6. Available Product Forms from Huaxiao-Alloy
Huaxiao-Alloy supplies Grade 23 Ti-6Al-4V ELI in full industrial and medical forms.
6.1 Titanium Bars & Rods
ASTM F136 / ASTM B348
Hot-rolled, forged, centerless ground
For implants and aerospace parts
6.2 Titanium Sheets & Plates
ASTM B265 / AMS 4911
Medical and aerospace surface finish
Thickness: 0.5 mm – 60 mm
6.3 Titanium Wires
ASTM F136
Used for surgical fasteners & springs
6.4 Titanium Tubes & Pipes
ASTM B861 / B338
Seamless precision tubes
Aerospace hydraulic & medical devices
6.5 Forgings & Custom Machining
Implants
Structural aerospace parts
OEM machining per drawings
7. Typical Applications of Grade 23 Titanium Alloy
7.1 Medical & Biomedical Industry
Orthopedic implants
Dental implants
Bone screws & plates
Spinal fixation systems
7.2 Aerospace Industry
Aircraft structural components
Engine components
Landing gear parts
Spacecraft structures
7.3 High-End Industrial Engineering
High-performance fasteners
Pressure-bearing components
Precision mechanical parts
7.4 Marine & Offshore (Selective Use)
High-performance fasteners
Lightweight corrosion-resistant components
8. Comparison: Grade 5 vs Grade 23 Titanium Alloy
| Property | Grade 5 | Grade 23 |
|---|---|---|
| Oxygen Content | ≤ 0.20% | ≤ 0.13% |
| Ductility | Good | Excellent |
| Fatigue Resistance | Very Good | Superior |
| Medical Approval | Limited | ASTM F136 |
| Cost | Lower | Higher |
| Reliability | High | Very High |
➡️ Grade 23 is chosen when failure is not an option.
9. Fabrication, Machining & Welding Guide
9.1 Machining
More machinable than Grade 5
Low cutting speed required
Use sharp carbide tools
9.2 Forming
Good hot formability
Limited cold forming due to strength
9.3 Welding
Excellent weldability
TIG / electron beam welding preferred
Strict inert gas protection required
10. Heat Treatment & Microstructure
Typically supplied annealed
Alpha-beta structure
Heat treatment improves fatigue life
Not recommended for uncontrolled heat exposure
11. Quality Control & Medical Compliance
Huaxiao-Alloy supplies Grade 23 with:
ASTM F136 compliance
EN 10204 3.1 / 3.2 MTC
Chemical & mechanical testing
Ultrasonic inspection
Grain size & microstructure testing
Full heat & batch traceability
12. Why Choose Huaxiao-Alloy as Your Grade 23 Supplier?
✅ Long-term export experience in medical titanium
✅ Aerospace & implant-grade quality control
✅ Full product range & custom machining
✅ Competitive pricing
✅ Fast global delivery
✅ Professional documentation support
ELI means Extra Low Interstitial, improving toughness and fatigue resistance.
Yes, it fully complies with ASTM F136 and ISO 5832-3.
Choose Grade 23 for medical and safety-critical parts; Grade 5 for general engineering.
Yes, including polished and medical-grade finishes.
Yes, with proper inert gas shielding.
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