Mechanical Properties and Applications of Gr23 Titanium Bar
Titanium has long been celebrated for its remarkable strength-to-weight ratio, corrosion resistance, and biocompatibility, making it one of the most valuable materials in modern engineering. Among its many alloys, Grade 23 Titanium (Ti-6Al-4V ELI) stands out as a premium version of the popular Grade 5 alloy, engineered specifically for applications that demand extreme purity, toughness, and fatigue resistance.
Known as the Extra Low Interstitial (ELI) grade, Gr23 Titanium Bar has become the preferred material for aerospace, medical, and cryogenic applications, where performance and reliability are non-negotiable.
In this comprehensive article, SAKYALLOY examines the mechanical properties and applications of Gr23 Titanium Bar, detailing how its composition, strength, and versatility make it indispensable across industries requiring both durability and precision.
Overview of Gr23 Titanium (Ti-6Al-4V ELI)
Grade 23 Titanium, also known as Ti-6Al-4V ELI, is a dual-phase alpha-beta titanium alloy containing approximately 6% aluminum and 4% vanadium. It was developed as a purer and more refined version of Grade 5 (Ti-6Al-4V), with lower levels of interstitial elements such as oxygen, nitrogen, and iron.
This reduced impurity content gives Grade 23 Titanium Bar enhanced ductility, fracture toughness, and fatigue resistance — properties that make it particularly suitable for high-stress environments such as aerospace components, deep-sea structures, and biomedical implants.
SAKYALLOY Gr23 Titanium Bars are produced under ASTM B348, AMS 4930, and ISO 5832-3 standards, ensuring precise chemical consistency, mechanical performance, and metallurgical integrity.
Chemical Composition
| Element | Content (%) |
|---|---|
| Aluminum (Al) | 5.5 – 6.5 |
| Vanadium (V) | 3.5 – 4.5 |
| Iron (Fe) | ≤ 0.25 |
| Oxygen (O) | ≤ 0.13 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.0125 |
| Titanium (Ti) | Balance |
By limiting oxygen and iron impurities, the alloy achieves superior toughness and fracture resistance, particularly under cyclic loading or impact conditions. This unique balance makes SAKYALLOY Gr23 Titanium Bar ideal for components where failure is simply not an option.
Mechanical Properties of Gr23 Titanium Bar
Gr23 Titanium is widely recognized for its outstanding combination of strength, ductility, and fatigue resistance, making it a high-performance material that outperforms most metals in its weight class.
| Property | Value (Typical, Annealed) | 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 |
| Poisson’s Ratio | 0.34 | – |
| Melting Point | 1660 | °C |
| Thermal Conductivity | 6.7 | W/m·K |
These mechanical properties demonstrate a unique balance between strength and flexibility, allowing Gr23 Titanium Bars to maintain structural integrity under extreme pressure, vibration, and temperature variations.
Key Mechanical Advantages
1. High Strength-to-Weight Ratio
Gr23 Titanium provides exceptional tensile strength with only half the weight of steel. This makes it invaluable for industries seeking lighter yet stronger materials — particularly aerospace, defense, and racing applications.
2. Superior Fracture Toughness
Its Extra Low Interstitial (ELI) purity enhances fracture toughness, allowing it to absorb more energy before failure. This property is essential in implants, high-speed turbines, and cryogenic vessels, where sudden fracture could be catastrophic.
3. Outstanding Fatigue Resistance
Under cyclic stress, Grade 23 Titanium shows excellent fatigue strength, even in harsh environments. Components like aircraft fasteners, joint implants, and compressor blades benefit greatly from this endurance.
4. Excellent Corrosion Resistance
A naturally forming titanium oxide film protects the alloy from corrosion in acidic, alkaline, and saline environments. This makes SAKYALLOY Gr23 Titanium Bar ideal for marine engineering and biomedical implants.
5. Biocompatibility and Non-Toxicity
Gr23 Titanium is completely biocompatible, meaning it does not react with body tissues or fluids. It is widely used in orthopedic, dental, and surgical implants due to its non-allergenic and non-toxic nature.
Heat Treatment and Microstructure
Gr23 Titanium Bars are typically supplied in the annealed condition, providing optimal ductility and machinability. However, various heat treatments can modify their mechanical behavior:
| Heat Treatment | Purpose | Effect |
|---|---|---|
| Solution Annealing (700–950°C) | Homogenizes microstructure | Improves ductility |
| Aging (480–650°C) | Precipitation strengthening | Increases hardness and strength |
| Stress Relieving (500–650°C) | Removes machining stress | Enhances dimensional stability |
The resulting fine alpha-beta microstructure offers superior mechanical balance — combining the strength of beta phase with the toughness of alpha phase — an essential feature for precision-engineered parts.
SAKYALLOY employs controlled heat treatment cycles to ensure consistent microstructure and mechanical uniformity in every Gr23 Titanium batch.
Machinability and Fabrication
Although titanium is harder to machine than traditional steels, Gr23 Titanium offers improved workability due to its lower hardness compared to Grade 5.
Recommended Processing Guidelines:
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Cutting Speed: 30–50 m/min
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Tool Material: Coated carbide or polycrystalline diamond (PCD)
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Coolant: High-pressure emulsion or oil-based coolant
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Welding: TIG or Electron Beam with inert gas protection
SAKYALLOY’s precision CNC machining facilities produce titanium bars and components with exceptional dimensional accuracy, surface finish, and repeatability — ensuring they meet aerospace and medical tolerances.
Corrosion and Environmental Performance
Gr23 Titanium exhibits excellent corrosion resistance across multiple environments, including:
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Seawater and Marine Atmosphere: Resistant to pitting, crevice corrosion, and stress corrosion cracking.
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Acidic Solutions: Stable in oxidizing acids such as nitric acid; resistant to mild sulfuric and hydrochloric acid.
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Alkaline Media: Performs exceptionally in caustic soda and ammonium hydroxide.
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Biological Fluids: Inert and resistant to corrosion in body environments (blood, plasma, saline).
This outstanding chemical stability ensures long-term service performance in both industrial and medical settings.
Applications of Gr23 Titanium Bar
The versatility of Gr23 Titanium Bar makes it ideal for multiple industries requiring a combination of lightweight design, durability, and reliability.
1. Aerospace Industry
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Aircraft fasteners, bolts, and nuts
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Landing gear components
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Hydraulic system tubing
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Engine compressor blades and spacers
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Cryogenic fuel systems
The alloy’s lightweight strength and fatigue resistance reduce aircraft weight, increase fuel efficiency, and enhance flight safety.
2. Medical and Healthcare Applications
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Orthopedic implants (hip and knee joints)
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Dental implants and abutments
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Surgical instruments
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Spinal fixation devices
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Cardiovascular and cranial implants
Because of its biocompatibility and corrosion resistance, SAKYALLOY Gr23 Titanium Bars are trusted by medical device manufacturers for use in permanent body implants under ASTM F136 / ISO 5832-3 standards.
3. Marine and Offshore Engineering
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Subsea valves and pump shafts
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Deep-sea pressure housings
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Offshore structural supports
In seawater exposure, titanium resists corrosion better than stainless steel and copper alloys, ensuring longer service life with minimal maintenance.
4. Automotive and Motorsport
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Engine valves and connecting rods
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Suspension and drivetrain components
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High-performance exhaust systems
The high specific strength of Gr23 allows automakers and racing engineers to design lighter, faster, and more efficient systems while maintaining durability.
5. Industrial and Chemical Processing
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Heat exchangers and reactors
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Chemical pump impellers
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Pressure vessels and piping systems
In chemical plants and acid-handling facilities, Gr23 Titanium Bars provide long-lasting resistance to corrosion and mechanical wear.
6. Cryogenic and Space Applications
The ELI purity level gives Grade 23 exceptional performance at ultra-low temperatures, making it suitable for:
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Cryogenic tanks
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Satellite components
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Space propulsion systems
Its ability to maintain ductility and impact strength below –200°C ensures reliability in deep-space and liquid gas storage environments.
Comparison with Grade 5 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% |
| Fatigue Resistance | Excellent | Superior |
| Fracture Toughness | Good | Very High |
| Biocompatibility | Moderate | Excellent |
Gr23 Titanium trades a slight reduction in strength for enhanced ductility, fatigue resistance, and biocompatibility, giving it an edge in precision and medical applications.
Testing and Quality Assurance
To guarantee performance and reliability, SAKYALLOY Gr23 Titanium Bars undergo extensive testing and certification:
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Mechanical Testing: Tensile, yield, hardness, and fatigue tests (ASTM E8 / E466)
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Ultrasonic Inspection: Detects internal inclusions and porosity
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Chemical Analysis: Confirms purity levels and interstitial content (ASTM E1473)
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Dimensional Accuracy: Verified via coordinate measuring systems
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Surface Finish Inspection: Ensures smoothness and defect-free condition
All products are delivered with EN 10204 3.1 / 3.2 certificates for full traceability and compliance.
Why Choose SAKYALLOY
SAKYALLOY is a leading global supplier of titanium, nickel, and stainless steel materials, offering precision-engineered bars, sheets, tubes, and forgings.
Our Competitive Advantages Include:
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ISO 9001:2015 Certified Manufacturing Facilities
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Advanced forging and vacuum melting technologies
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In-house machining, heat treatment, and testing facilities
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Compliance with ASTM, AMS, and ISO standards
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Global logistics network ensuring fast delivery and technical support
Through continuous innovation and strict quality control, SAKYALLOY ensures that every Gr23 Titanium Bar meets the highest standards for performance, safety, and consistency.
Conclusion
The Mechanical Properties and Applications of Gr23 Titanium Bar highlight its role as one of the most advanced and versatile titanium alloys in existence. With superior toughness, corrosion resistance, and biocompatibility, it continues to shape the future of aerospace engineering, medical technology, and advanced manufacturing.
By combining metallurgical precision, advanced production technology, and global certification compliance, SAKYALLOY delivers Grade 23 Titanium Bars that meet the demanding requirements of critical industries around the world.