ASTM F67 Grade 4 Pure Titanium Wire Description
What is ASTM F67 Grade 4 Pure Titanium Wire?
ASTM F67 Grade 4 pure titanium wire is the strongest among the commercially pure titanium grades. It meets the ASTM F67 specification, which is the international standard for unalloyed titanium used in surgical implant applications.
Unlike the softer Grade 1 or Grade 2, Grade 4 offers higher strength while still keeping good ductility and formability. It maintains a single-phase alpha structure at room temperature. This will give you:
Highest strength among pure titanium grades–Up to 740 MPa tensile strength.
Good ductility–Can still be bent and formed, though not as easily as Grade 1.
Superior biocompatibility–Non-toxic, non-sensitizing, and corrosion-resistant in body fluids.
With strictly controlled impurities (H ≤ 0.015%, O ≤ 0.40%), ASTM F67 Grade 4 wire is widely used in medical implants that need higher strength than Grade 2 can provide, as well as in aerospace fasteners and structural components where pure titanium is preferred over alloys.
ASTM F67 Grade 4 Pure Titanium Wire–The Strongest Pure Titanium. Built for High-Strength Medical and Aerospace Applications.
Technical Specifications
1. Diameter ranges
Common sizes: 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 mm.
2. Surface Treatment
| Surface type | Process | Characteristics | Best for |
| Pickled | HF+HNO₃ acid immersion | Matte silver-gray, oxide-free, uniform | Medical implants, general structural wire |
| Bright | Pickling+polishing | Mirror-like, Ra ≤ 0.4 μm, smooth | Precision surgical instruments |
| Drawn | As-drawn from dies | Natural metal, fine lines | High-strength fasteners, lock wire |
Note: All surface finishes are free from oxide scale, cracks, and contaminants, ensuring compliance with ASTM F67 standards.
3. Production Process & Equipment
- World-class line: Imported Danieli continuous rolling line for Ti/Ni/Zr alloy wires.
- Ultra-high straightness: φ5 mm wire straightness deviation ≤ 2/1000.
- Mass production ready: Stable supply with full-scale production capability.
4. Aviation-grade manufacturing process
- Vacuum melting ensures high purity and stable composition.
- Multi-pass cold drawing (bright drawing or pickling) results in a clean and bright surface.
- Precision straightening guarantees a straightness of ≤ 2/1000 for aviation use.
- Roller die cold drawing controls dimensional accuracy and grain structure.
- Full-process inspection ensures dimensional accuracy, surface quality and mechanical properties.
5. Basic Product Information
| Item | Details |
| Product name | Grade 4 Pure Titanium Wire |
| Equivalent | Gr.4 (ASTM), TA3 (Chinese, near), CP titanium Grade 4 |
| Execution standards | ASTM F67, ASTM B863, ISO 5832-2 |
| Supply form | Straight wire, coil wire |
| Surface condition | Pickled, bright, drawn |
6. Chemical Composition (ASTM F67)
| Element | Ti | Fe | C | N | H | O |
| Content % | Balance | ≤0.50 | ≤0.08 | ≤0.05 | ≤0.015 | ≤0.40 |
7. Mechanical Properties
| Condition | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness HV |
| Annealed (M) | 550–740 | 483–620 | ≥ 15 | 200–240 |
| Cold drawn (Y) | 650–850 | ≥ 550 | ≥ 8 | 200–240 |
8. Physical Properties
|
Item |
Value |
|
Density |
4.51 g/cm³ (56% of steel) |
|
Elastic modulus |
105 GPa |
|
Melting point |
~1668 ℃ |
|
Thermal expansion |
~8.6×10⁻⁶ /℃ |
|
Thermal conductivity |
~17 W/(m·K) |
|
Magnetism |
Non-magnetic |
Product Features
- Highest strength pure titanium: Stronger than Grade 1, Grade 2, and Grade 3.
- Good ductility: Still offers 15% elongation for moderate forming.
- Excellent biocompatibility: Proven for surgical implant use.
- Superior corrosion resistance: Resists body fluids, seawater, and chemicals.
- Light weight: Density only 56% of steel
- Non-magnetic: Safe for MRI and sensitive instruments.
How Grade 4 Compares to Other Pure Titanium Grades
Grade | Tensile (MPa) | Elongation (%) | Best For |
Grade 1 | 240–340 | ≥24 | Maximum formability, welding wire |
Grade 2 | 345–450 | ≥20 | Balanced strength and ductility |
Grade 3 | 450–550 | ≥18 | Moderate strength |
Grade 4 | 550–740 | ≥15 | Highest strength among pure grades |
Key Applications
1) Used in medical
- Orthopedic implants requiring higher strength (hip stems, bone screws).
- Dental implants and abutments.
- Surgical instruments that need durability.
2) Used in Aerospace & Industrial
- High-strength pure titanium fasteners (where alloys are not required).
- Structural wire and brackets.
- Chemical processing components.
Quality Assurance
- Manufactured in strict accordance with ASTM F67 industrial and medical specifications.
- Each batch comes with a complete Material Test Report (MTR) for full traceability.
- Multi-step quality control includes chemical analysis, mechanical testing, dimensional checks, straightness and surface inspection.
- Custom sizes and surface finishes are available on request.