6AL-4V ELI Grade 23 Titanium Round Bar
6Al-4V ELI (Grade 23) titanium alloy round bar is a titanium material specifically developed for high strength, long fatigue life, and excellent biocompatibility. It is widely used in critical applications such as medical implants, aerospace, and cryogenic equipment, which require extremely high strength, reliability, and certification.
Compared to standard Grade 5, ELI grades have lower interstitial element content, resulting in improved fracture toughness, fatigue performance, and improved low-temperature mechanical properties. Chalco Titanium is available in sizes from 3mm to 200mm (0.125" to 8"), with a wide range of sizes available for global shipping within 48 hours. Click here to view a detailed list of stock sizes.
Why choose Grade 23 titanium round bar?
- High strength and light weight, with a tensile strength of ≥860 MPa and a density of only 4.43 g/cm³, which is about 40% lighter than stainless steel.
- Long fatigue life, oxygen content ≤ 0.13%, about 10–15% higher than ordinary Grade 5.
- Exist −196°C low temperature or welding areas maintain excellent toughness, reducing the risk of crack growth.
- The shock performance is stable in cryogenic environments and is suitable for liquid nitrogen temperature areas and cryogenic equipment.
- It has strong processing adaptability, excellent welding performance, and is suitable for TIG/EB processes and precision cutting requirements.
6Al-4V ELI titanium round bar specifications and certifications
Chalco Titanium's 6Al-4V ELI titanium alloy round bars adhere to multiple international standards and certifications, ensuring global quality and compliance for aerospace, medical, and industrial applications.
Complies with the following international standards:
- ASTM F136
- ASTM F67
- ASTM B348
- AMS 2631
- AMS 4930
- AMS 6932
- MIL-T-9047
Possess the following certifications and material proofs:
- ISO 5832-3
- EN 10204 3.1
- SGS or TÜV 3.2
Industrial applications of Grade 23 titanium round bar
Grade 23 (6Al-4V ELI) titanium round bar is widely used in multiple industries with high performance requirements. With its high strength, excellent fatigue performance, low-temperature toughness and outstanding biocompatibility, it shows strong adaptability in fields such as medical, aerospace and industrial energy.
Medical field
In the medical field, this material is commonly used in the manufacture of long-term implantable devices such as orthopedic screws, pedicle screws, intramedullary nails, and dental implants. It has passed ISO 10993 biocompatibility testing and has undergone over 20 million cycles of fatigue testing without cracking, ensuring long-term reliability and safety during use.
Aerospace
In aerospace applications, Grade 23 round bars are suitable for high load parts such as aircraft structural parts, fuel tank heads, landing gear connections, etc. It has stable impact performance under 100°C conditions and supports TIG/EB welding, with a mechanical property retention rate of over 95% after welding.
Industrial manufacturing
In the industrial and energy sectors, this material is used in cryogenic pressure vessels, liquid nitrogen storage tanks, offshore engineering foundation components, and high-pressure equipment, demonstrating exceptional resistance to chloride corrosion. Customers have reported equipment operating continuously for over seven years without maintenance, demonstrating its durability and cost-effectiveness.
6Al-4v eli titanium round bar application case
Medyssey Zenius™ spinal fixation system
The U.S. FDA has approved the Zenius™ series of titanium alloy spinal fixation devices (510(k) No. K121670), the system includes Ti-6Al-4V connecting screws and pedicle screws made of ELI (compliant with ASTM F136).
The use of Grade 23 material ensures that the screws and connecting rods have a tensile strength of ≥860 MPa and ≥10 % elongation, which directly improves the reliability of the implant.
SeaSpine Daytona® small stature spinal system
SeaSpine's Daytona® series has received FDA 510(k) (K163604) clearance for all implant components, including 4.5–7.5 mm diameter connecting rods made of Ti-6Al-4V ELI material.
The high fatigue performance and low modulus characteristics of Grade 23 enable the system to achieve stable correction and long-term tolerance in small patients, supporting long-term fixation and reducing patient burden.
Western Superconducting Corporation develops key aircraft structural parts
Western Superconducting Corporation has successfully developed Ti-6Al-4V ELI large-diameter titanium rods ranging from Ø200mm to Ø650mm. In particular, Ø650mm is currently the world's leading specification and has been widely used in key structural parts such as aircraft main load-bearing beams, fuselage frames, and landing gear, meeting the aircraft's stringent requirements for high load, long life, and high reliability.
This product utilizes a triple vacuum arc melting process, with an oxygen content controlled at 0.02%–0.03%. It boasts pure composition and a fine, uniform structure. Compared to conventional Ti-6-4 alloy, it exhibits slower crack propagation and a longer fatigue life. Ultrasonic testing noise levels reach as low as -16dB, meeting the high standards required for aviation structural components.
Difference between 6Al-4V ELI and 6Al-4V titanium round bar
| project | 6Al-4V (Grade 5) | 6Al-4V ELI (Grade 23) |
|---|---|---|
| Full name | Titanium 6Al-4V | Titanium 6Al-4V Extra Low Interstitial (ELI) |
| Main differences | Standard grade Ti-6Al-4V | Lower interstitial elements (especially oxygen content) |
| Upper limit of oxygen content | 0.20% | 0.13% |
| Strength performance | Yield strength ≥ 880 MPa, tensile strength ≥ 950 MPa | Yield strength ≥ 795 MPa, tensile strength ≥ 860 MPa |
| Fatigue performance | good | Better, fatigue life increased by 10–15% |
| fracture toughness | Conventional toughness | Higher, suitable for welding parts and use under extreme loads |
| Low temperature performance | - | Suitable for cryogenic environments up to −196°C |
| Biocompatibility | generally | ISO 10993 certified for implantable medical devices |
| Common Applications | Aviation parts, structural parts, industrial equipment | Medical implants, aerospace cryogenic structures, cryogenic containers |
| standard | ASTM B348 Gr.5, AMS 4928, etc. | ASTM F136, AMS 4930, ISO 5832-3, etc. |
| price | Lower | Slightly higher, but with better performance, suitable for critical application scenarios |
6Al-4v eli titanium round rod chemical composition
| Element | Content Range |
|---|---|
| Titanium | Balance |
| Aluminum | 5.50–6.50% |
| Vanadium | 3.50–4.50% |
| Iron | ≤0.25% |
| Oxygen | ≤0.130% |
| Carbon | ≤0.080% |
| Nitrogen | ≤0.050% |
| Hydrogen | ≤0.013% |
| Other (Total) | ≤0.40% |
The oxygen content in 6Al-4V ELI alloy is ≤0.13%, nitrogen ≤0.05%, and hydrogen ≤0.013%. These low-interstitial element ratios significantly improve the fracture toughness and fatigue life of the material, making it particularly suitable for high cyclic loads and low-temperature impact environments.
Mechanical properties of 6Al-4v eli
| Project Classification | state | 0.2% yield strength | Ultimate tensile strength | Elongation (4D) | Sectional shrinkage |
|---|---|---|---|---|---|
| Minimum specified value | Mill annealed | 115 ksi / 793 MPa | 125 ksi / 862 MPa | 10% | 25% |
| Typical performance values | Mill annealed | 120 ksi / 827 MPa | 130 ksi / 896 MPa | 15% | 45% |
| Typical performance values | Beta annealed | 112 ksi / 770 MPa | 125 ksi / 860 MPa | 11% | twenty three% |
| Typical performance values | Recrystallization annealed | 103 ksi / 710 MPa | 128 ksi / 860 MPa | 12% | 36% |
Minimum specified
These are the minimum performance requirements specified in the standards, such as the baseline strength and ductility that must be achieved for use in medical or aerospace applications:
- Yield strength ≥ 793 MPa, tensile strength ≥ 862 MPa, elongation ≥ 10%
- This shows that even in its most basic state, it can meet the requirements of high stress and structural safety.
Typical properties
This section shows the actual performance that the material can achieve under different heat treatment conditions:
Mill annealed
The strength reaches 896 MPa and the elongation is as high as 15%, which is a good balance between strength and plasticity.
Beta annealed
The yield strength is slightly lower but the toughness is better, which is suitable for structures with high fatigue requirements.
Recrystallization annealed
Excellent ductility, with a cross-sectional shrinkage of 36%, suitable for complex molding or subsequent processing
6Al-4V ELI titanium round bar processing overview
| Processing type | Description |
|---|---|
| Hot working | It can be formed by hot rolling, forging, and hot pressing, with processing temperatures between 870–950°C (1600–1740°F) in the α/β phase region; 650°C (1200°F) is common for sheet hot forming. It is also suitable for superplastic forming (870–925°C). Care should be taken to remove the α shell. |
| Warm working | Forming at a medium temperature of around 427°C (800°F) reduces yield strength by approximately 40%, facilitating deformation. Widely used in isothermal forming applications for medical devices and aerospace parts. |
| Cold working | It can be cold drawn and extruded, but has low plasticity and obvious elastic rebound problems. Springback is usually controlled by "overbending" or heating correction. |
| Machinability | The machining performance score is 22% (based on B1112). Low cutting speeds, high feed rates, and generous use of cutting fluid are recommended. Cutting interruptions and seizure prevention are avoided. Chlorine-free cutting fluid is used to prevent stress corrosion. Safety precautions are required as titanium chips are flammable. |
Hot working
Cold working
Machining
6Al-4v eli titanium round bar stock size
Chalco Titanium offers Grade 23 (6Al-4V ELI) titanium alloy round bar in stock from 1/8" to 3" in standard lengths up to 144 inches. We also offer custom cutting services to meet varying length requirements. All sizes are manufactured to tight tolerances, making them suitable for precision machining and structural assembly.
| product | Diameter (inches) | Length (inches) |
|---|---|---|
| 1/8" Titanium round bar grade 23 6al-4v eli | 1/8" | 144" or customized |
| 3/16" Titanium round bar grade 23 6al-4v eli | 3/16" | 144" or customized |
| 1/4" Titanium round bar grade 23 6al-4v eli | 1/4" | 144" or customized |
| 5/16" Titanium round bar grade 23 6al-4v eli | 5/16" | 144" or customized |
| 3/8" Titanium round bar grade 23 6al-4v eli | 3/8" | 144" or customized |
| 7/16" Titanium round bar grade 23 6al-4v eli | 7/16" | 144" or customized |
| 1/2" Titanium round bar grade 23 6al-4v eli | 1/2" | 144" or customized |
| 5/8" Titanium round bar grade 23 6al-4v eli | 5/8" | 144" or customized |
| 3/4" Titanium round bar grade 23 6al-4v eli | 3/4" | 144" or customized |
| 7/8" Titanium round bar grade 23 6al-4v eli | 7/8" | 144" or customized |
| 1" Titanium round bar grade 23 6al-4v eli | 1" | 144" or customized |
| 1-1/2" Titanium round bar grade 23 6al-4v eli | 1-1/2" | 144" or customized |
| 2" Titanium round bar grade 23 6al-4v eli | 2" | 144" or customized |
| 2-1/2" Titanium round bar grade 23 6al-4v eli | 2-1/2" | 144" or customized |
| 3" Titanium round bar grade 23 6al-4v eli | 3" | 144" or customized |
| 3-1/2" Titanium round bar grade 23 6al-4v eli | 3-1/2" | 144" or customized |
| 4" Titanium round bar grade 23 6al-4v eli | 4" | 144" or customized |
| 5" Titanium round bar grade 23 6al-4v eli | 5" | 144" or customized |
| 6" Titanium round bar grade 23 6al-4v eli | 6" | 144" or customized |
| 7" Titanium round bar grade 23 6al-4v eli | 7" | 144" or customized |
| 8" Titanium round bar grade 23 6al-4v eli | 8" | 144" or customized |
6Al-4v eli titanium round bar tolerances
To meet our customers' stringent requirements for high-precision titanium alloy machining, Chalco Titanium offers 6Al-4V ELI (Grade 23) titanium round bar with extremely tight dimensional tolerances. We stock sizes ranging from 1/8" to 2", with diameter tolerances as precise as ±0.005", with a maximum tolerance of ±1/64".
| Diameter (inches) | Tolerance (± inches) |
|---|---|
| Up to 0.25 (exclusive) | ±0.005" |
| 0.25 to 0.3125 (inclusive) | ±0.005" |
| Over 0.3125 to 0.4375 (inclusive) | ±0.006" |
| Over 0.4375 to 0.625 (inclusive) | ±0.007" |
| Over 0.625 to 0.875 (inclusive) | ±0.008" |
| Over 0.875 to 1.000 (inclusive) | ±0.009" |
| Over 1.000 to 1.125 (inclusive) | ±0.010" |
| Over 1.125 to 1.250 (inclusive) | ±0.011" |
| Over 1.250 to 1.375 (inclusive) | ±0.012" |
| Over 1.375 to 1.500 (inclusive) | ±0.014" |
| Over 1.500 to 2.000 (inclusive) | ±1/64" |
FAQ
Can you provide Grade 23 of AMS 4930 material?
Yes, our inventory covers both ASTM F136 and AMS 4930.
Is customized length supported?
Yes, the minimum cutting length is 100 mm and the maximum cutting length is 4 meters.
What machining methods are supported?
6Al-4V ELI is suitable for general precision machining such as turning, milling, and drilling. Low speeds, high feed rates, and ample coolant are recommended to minimize tool wear and surface burns. Non-chlorinated cutting fluids are also recommended to minimize the risk of stress corrosion.
What surface treatment options are available?
We offer a variety of surface conditions: black leather (after hot working), pickling (standard delivery), lathing, sanding, mirror polishing, ultrasonic cleaning, etc. We also support customized passivation treatment or titanium anodizing to meet cleanliness and appearance requirements.
Is heat treatment required after welding?
Generally not required, but for high fatigue life applications, a vacuum annealing treatment is recommended.
Is there any third-party certification?
We can provide 3.2 certificates issued by SGS, TÜV, BV and other institutions according to customer needs.
Do you support export? How long is the delivery time?
We support global export, regular stock can be shipped within 48 hours, and special size customization can be delivered within 5-10 working days.
