ASTM F67 Grade 2 Pure Titanium Wire Description
What is ASTM F67 Grade 2 Pure Titanium Wire?
ASTM F67 Grade 2 Pure Titanium Wire is a commercially pure titanium (CP Ti) specification specifically defined for medical implant applications. It is the most widely used grade of pure titanium in the human body contact industry due to its excellent biocompatibility, high corrosion resistance, and moderate strength.
It meets the ASTM F67, ASTM B863, and ISO 5832-2 standards and is classified as unalloyed titanium with controlled interstitial elements (oxygen, iron, nitrogen, carbon, hydrogen).
ASTM F67 Grade 2 titanium wire is extensively used in medical devices, surgical implants, orthopedic fixation products, dental components, aerospace fasteners, and chemical processing equipment — where biocompatibility and corrosion resistance are the primary requirements.
ASTM F67 Grade 2 Pure Titanium Wire — Biocompatible, Corrosion-Resistant, Implant-Ready.
Technical Specifications
1. Diameter ranges for Aviation titanium wire
- Common aviation sizes: 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 mm
- Welding wire sizes: 0.8, 1.0, 1.2, 1.6, 2.0, 2.4, 3.0 mm
- Ultra-fine sizes for precision components: 0.1, 0.15, 0.2, 0.3, 0.4 mm
2. Diameter Ranges (Medical & Industrial Grades)
|
Application |
Common Diameters (mm) |
|
Surgical sutures |
0.1-0.50 |
|
Orthopedic wires (K-wires, cerclage) |
0.8-2.5 |
|
Dental wires |
0.5-1.5 |
|
Medical mesh & baskets |
0.1-0.8 |
|
Aerospace fasteners |
1.0-6.0 |
|
Chemical industry mesh |
0.5-4.0 |
3. Supply Forms
Straight wire (cut to length), Coil wire (continuous length), Spooled wire (for automated winding)
Pickled, bright, as-drawn and degressed surface.
4. Surface Finishes
|
Surface Type |
Process |
Application |
|
Pickled (matte) |
Acid pickling |
General industrial, chemical equipment |
|
Bright (polished) |
Mechanical or electrolytic polishing |
Medical implants, dental wires |
|
Ground |
Centerless grinding |
High precision, aerospace fasteners |
5. Chemical Composition (ASTM F67 Grade 2)
Meets ASTM F67, ISO 5832-2, and ASTM B863 specifications:
|
Element |
Content (%) |
Requirement |
|
Titanium (Ti) |
Balance |
— |
|
Nitrogen (N) |
≤ 0.03 |
Controlled for biocompatibility |
|
Carbon (C) |
≤ 0.08 |
Low carbon prevents sensitization |
|
Hydrogen (H) |
≤ 0.015 |
Critical for hydrogen embrittlement control |
|
Iron (Fe) |
≤ 0.30 |
Minimized for purity |
|
Oxygen (O) |
≤ 0.25 |
Determines strength grade (Grade 2 = 0.25% max) |
6. Mechanical Properties (Annealed Condition)
|
Property |
Value |
|
Tensile Strength |
345 – 550MPa |
|
Yield Strength (0.2% offset) |
275 – 450MPa |
|
Elongation |
15%- 20% |
|
Hardness (HV) |
140-200 |
|
Modulus of Elasticity |
105GPa |
7. Physical Properties
|
Property |
Value |
|
Density |
4.51 g/cm³ |
|
Melting Point |
~1668 °C |
|
Thermal Conductivity |
~15.2 W/(m·K) |
|
Thermal Expansion |
8.6 × 10⁻⁶ /°C |
|
Electrical Resistivity |
~57 μΩ·cm |
|
Magnetism |
Non-magnetic |
Key Features
- Excellent Biocompatibility: Non-toxic, non-allergenic, fully compatible with human tissue and bone.
- Superior Corrosion Resistance: Outstanding in saline, body fluids, seawater, and chloride-containing environments.
- Good Strength-to-Weight Ratio: Lower density (4.51 g/cm³) with adequate strength for load-bearing implants.
- Non-magnetic: Safe for MRI and sensitive electronic environments.
- High Formability & Weldability: Easy to cold form, bend, and weld (requires inert gas shielding).
- Osseointegration Capability: Bone grows directly onto titanium surface without fibrous encapsulation.
Key Applications
Application | Specific Use | Reason |
Orthopedic Implants | Cerclage wires, K-wires, tension bands | Biocompatible, non-toxic, osseointegrates |
Dental Implants | Orthodontic archwires, ligature wires | Non-allergenic, corrosion-resistant in saliva |
Surgical Sutures | Titanium surgical sutures | Flexible, strong, tissue-compatible |
Sternal Closure Wires | Sternum closure after cardiac surgery | High fatigue resistance, MRI safe |
Medical Mesh | Hernia mesh, bone fixation mesh | Good formability, tissue integration |
Comparison: ASTM F67 Grade 2 vs Other Titanium Grades
Grade | Type | Oxygen (%) | Strength | Biocompatibility |
Grade 1 | CP Ti | ≤ 0.18 | Lowest | Excellent |
Grade 2 | CP Ti | ≤ 0.25 | Medium | Excellent |
Grade 3 | CP Ti | ≤ 0.35 | Medium-high | Good |
Grade 4 | CP Ti | ≤ 0.40 | Highest | Good |
Grade 5 (Ti-6Al-4V) | Alpha-Beta | — | Highest | Good (but contains Al/V) |
- So Grade 2 is preferred for medical applications where aluminum and vanadium (in Grade 5) are not desired, but higher strength than Grade 1 is needed.
Quality Assurance
- 100% compliant with ASTM F67, ISO 5832-2, and ASTM B863
- Complete Material Test Report (MTR) with traceability per batch
- Ultrasonic testing for internal defects (upon request)
- Surface inspection (visual, eddy current)
- Hydrogen content analysis — critical for titanium wire
- Tensile and hardness testing per batch