Gr23 Titanium Bar: Superior Strength with Exceptional Biocompatibility
In industries that demand both mechanical excellence and human safety, few materials can match the performance of Gr23 Titanium Bar (Ti-6Al-4V ELI). Known for its superior strength, light weight, and exceptional biocompatibility, this titanium alloy stands as a cornerstone material in both medical technology and aerospace engineering.
Engineered as the Extra Low Interstitial (ELI) variant of Grade 5 titanium, Gr23 Titanium Bar offers enhanced toughness, improved ductility, and greater resistance to fatigue — all while remaining completely safe for long-term use within the human body.
In this article, SAKYALLOY explores how the unique properties of Gr23 Titanium Bar combine structural performance and biocompatibility, making it one of the most trusted materials for critical applications in healthcare, aviation, and high-performance engineering.
What Is Gr23 Titanium (Ti-6Al-4V ELI)?
Gr23 Titanium, officially known as Ti-6Al-4V ELI, is an alpha-beta titanium alloy consisting of titanium (Ti) alloyed with 6% aluminum and 4% vanadium. The “ELI” (Extra Low Interstitial) designation indicates reduced impurity levels — specifically oxygen, nitrogen, carbon, and iron — leading to improved ductility and fracture toughness.
This enhanced purity gives Gr23 Titanium Bar the ability to perform reliably under extreme mechanical stress, cyclic fatigue, and biological exposure.
At SAKYALLOY, all Gr23 Titanium Bars are produced in compliance with ASTM B348 / ASTM F136 / ISO 5832-3 standards, ensuring that each product meets the strict requirements of both aerospace and medical industries.
Chemical Composition
| Element | Content (%) | Purpose |
|---|---|---|
| Titanium (Ti) | Balance | Provides strength, corrosion resistance, and low density |
| Aluminum (Al) | 5.5 – 6.5 | Increases tensile strength and oxidation resistance |
| Vanadium (V) | 3.5 – 4.5 | Enhances toughness and stability of the beta phase |
| Iron (Fe) | ≤ 0.25 | Controlled to improve toughness and reduce brittleness |
| Oxygen (O) | ≤ 0.13 | Lower oxygen improves ductility and fatigue resistance |
| Carbon (C) | ≤ 0.08 | Maintains hardness without compromising toughness |
| Nitrogen (N) | ≤ 0.05 | Prevents grain growth and preserves ductility |
| Hydrogen (H) | ≤ 0.0125 | Prevents hydrogen embrittlement |
The reduced interstitial elements are what differentiate Gr23 Titanium from Grade 5 (Ti-6Al-4V). This refinement produces a cleaner microstructure, increasing fracture resistance and biocompatibility for mission-critical applications.
Mechanical Properties
| Property | Typical Value | Unit |
|---|---|---|
| Tensile Strength | 860 – 900 | MPa |
| Yield Strength (0.2%) | 795 – 830 | MPa |
| Elongation | 14 – 15 | % |
| Reduction of Area | 35 – 40 | % |
| Hardness | 30 – 32 | HRC |
| Density | 4.43 | g/cm³ |
| Modulus of Elasticity | 113.8 | GPa |
| Operating Temperature | –200°C to 400°C | °C |
These properties illustrate the remarkable balance of strength and ductility that SAKYALLOY Gr23 Titanium Bars deliver — a material strong enough for aerospace structures yet gentle and safe enough for human implantation.
Superior Strength-to-Weight Ratio
One of the defining advantages of titanium alloys is their unmatched strength-to-weight ratio. Gr23 Titanium Bar possesses a tensile strength approaching that of high-strength steels while weighing approximately 45% less.
This lightweight yet robust performance makes it ideal for:
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Aircraft fasteners and frames, where reduced mass improves fuel efficiency.
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Medical implants, where lightweight materials reduce patient fatigue and discomfort.
The high specific strength of SAKYALLOY Gr23 Titanium Bars ensures long-term mechanical stability with minimal maintenance or degradation.
Exceptional Biocompatibility
Biocompatibility refers to a material’s ability to coexist safely with living tissue — a property where Gr23 Titanium Bar truly excels.
1. Non-Toxic and Non-Allergenic
Unlike other metals that may release ions or trigger allergic reactions, titanium forms a stable oxide film (TiO₂) that prevents corrosion and ion release in body fluids.
2. Promotes Osseointegration
The surface of Gr23 Titanium allows natural bone integration, enabling implants to bond directly to skeletal tissue without rejection.
3. MRI and CT Compatibility
Titanium is non-magnetic and radiolucent, meaning it does not interfere with MRI or CT imaging — an essential feature for medical diagnostics.
4. Long-Term Durability in the Body
Its resistance to corrosion from blood, plasma, and saline solutions ensures decades of reliable service inside the human body.
These properties make SAKYALLOY Gr23 Titanium Bars the material of choice for orthopedic, dental, and cardiovascular implants, where biological safety cannot be compromised.
Microstructure and Metallurgical Advantages
Gr23 Titanium features a dual-phase alpha-beta microstructure, providing the perfect combination of strength, toughness, and fatigue resistance. The lower oxygen and iron levels lead to:
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Finer grain size → improved fatigue life.
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Enhanced fracture toughness → greater impact resistance.
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Stable alpha-beta balance → consistent performance across temperature extremes.
This metallurgical advantage enables SAKYALLOY Gr23 Titanium Bars to perform exceptionally well in both cryogenic and high-temperature environments.
Corrosion Resistance
Titanium’s naturally forming oxide film offers outstanding protection against corrosion in diverse environments, including:
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Seawater and saline conditions
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Oxidizing acids such as nitric acid
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Neutral and alkaline media
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Body fluids and organic compounds
The passive oxide layer self-repairs instantly when scratched or damaged, ensuring continuous protection. This makes Gr23 ideal for both marine and biomedical applications, where corrosion failure could be disastrous.
Aerospace Applications
The aerospace industry demands materials that combine lightweight performance, fatigue resistance, and thermal stability — all of which are inherent in Gr23 Titanium Bars.
Typical Aerospace Applications Include:
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Aircraft fasteners, bolts, and nuts
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Landing gear and hydraulic actuators
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Engine compressor blades and casings
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Cryogenic fuel tanks for rockets and space vehicles
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Structural frames for satellites
The superior fatigue resistance and fracture toughness of SAKYALLOY Gr23 Titanium Bars make them suitable for high-vibration, high-stress aerospace components that must operate flawlessly for years.
Medical Applications
In the medical field, Gr23 Titanium Bar is widely regarded as the standard for implantable materials. Its purity, mechanical strength, and tissue compatibility make it essential in modern healthcare.
Key Medical Uses Include:
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Orthopedic implants: hip joints, knee replacements, and bone screws
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Dental implants: posts, abutments, and crowns
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Spinal fixation systems
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Cranial and maxillofacial reconstruction
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Surgical instruments and medical devices
SAKYALLOY Gr23 Titanium Bars are manufactured under ASTM F136 / ISO 5832-3 certification, ensuring that every batch meets medical-grade purity and surface finish standards.
Manufacturing and Quality at SAKYALLOY
SAKYALLOY employs advanced technologies and strict process controls to ensure the highest quality in Gr23 Titanium Bar production.
1. Raw Material Processing
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Vacuum arc remelting (VAR) and electron beam melting (EBM) for purity.
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Precise alloying and refining to maintain Extra Low Interstitial composition.
2. Forging and Heat Treatment
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Hot forging improves grain flow and toughness.
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Solution annealing and stress relieving ensure mechanical uniformity.
3. Machining and Finishing
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CNC precision machining delivers tight tolerances.
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Surface finishing includes polishing, passivation, or electropolishing for improved biocompatibility.
4. Quality Testing
Each SAKYALLOY Gr23 Titanium Bar undergoes:
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Ultrasonic testing (UT) for internal defects.
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Tensile, hardness, and elongation testing.
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Chemical analysis (ASTM E1473) for composition verification.
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Dimensional and surface finish inspection.
All products come with EN 10204 3.1/3.2 test certificates and full traceability documentation.
Comparison: Gr23 vs. Gr5 Titanium
| Property | Gr5 (Ti-6Al-4V) | Gr23 (Ti-6Al-4V ELI) |
|---|---|---|
| Oxygen Content | ≤ 0.20% | ≤ 0.13% |
| Tensile Strength | 895 MPa | 860 MPa |
| Elongation | 10–12% | 14–15% |
| Fracture Toughness | Good | Excellent |
| Fatigue Resistance | High | Superior |
| Biocompatibility | Moderate | Excellent |
| Cryogenic Performance | Limited | Exceptional |
While both alloys share the same base chemistry, Gr23 Titanium Bar offers greater purity, ductility, and biocompatibility, making it ideal for medical and aerospace applications where failure is not an option.
Environmental and Long-Term Performance
Gr23 Titanium performs exceptionally well across a broad range of environmental conditions:
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Cryogenic temperatures: retains ductility and impact strength below –200°C.
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Elevated temperatures: maintains oxidation resistance up to 400°C.
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High humidity and saline exposure: remains corrosion-free for decades.
This durability ensures long service life and minimal maintenance, reducing lifetime costs for medical and aerospace users alike.
Why Choose SAKYALLOY
SAKYALLOY is a leading global manufacturer and exporter of titanium, nickel, and stainless steel materials. With years of expertise in metallurgy and precision engineering, SAKYALLOY delivers titanium products trusted by clients worldwide.
Our Advantages Include:
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ISO 9001:2015 certified production facilities.
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Full compliance with ASTM, AMS, and ISO standards.
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Advanced forging and heat treatment capabilities.
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In-house inspection and non-destructive testing.
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Global logistics and professional technical support.
By combining innovation and quality assurance, SAKYALLOY ensures that every Gr23 Titanium Bar provides unmatched purity, strength, and safety.
Conclusion
Gr23 Titanium Bar (Ti-6Al-4V ELI) represents the perfect balance between superior mechanical strength and exceptional biocompatibility. Its combination of light weight, corrosion resistance, toughness, and biological inertness makes it indispensable in both medical implants and aerospace components.
Whether supporting life inside the human body or enduring the stresses of flight, SAKYALLOY Gr23 Titanium Bars deliver performance, reliability, and longevity that engineers and surgeons can trust.