What is TB2 (Ti-5Mo-5V-8Cr-3Al)?
Ti-5Mo-5V-8Cr-3Al is a high-performance beta titanium alloy widely used in aerospace, medical devices, CNC machining, and industrial applications. This comprehensive guide covers its chemical composition, mechanical properties, machining characteristics, and practical applications per ASTM/GB standards.
Chemical Composition
| Element | Content (%) | Standard |
|---|---|---|
| Primary Element | Balance | ASTM/GB |
| Alloying Elements | Per specification | ASTM/GB |
| Impurities (max) | ≤0.1% | ASTM |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥500 MPa | ASTM |
| Yield Strength (0.2% offset) | ≥300 MPa | ASTM |
| Elongation | ≥15% | ASTM |
| Hardness | 200 HV / 95 HRB | ASTM |
Key Features
- Excellent mechanical properties: High strength-to-weight ratio, suitable for lightweight design
- Good corrosion resistance: Resistant to seawater, acids, alkalis, and industrial atmospheres
- Superior machinability: Excellent CNC machining characteristics with proper tooling
- Wide temperature range: Maintains properties from cryogenic to elevated temperatures
- Biocompatible: Safe for medical and food processing applications
Common Applications
- Aerospace: Aircraft structural components, engine parts, landing gear, fasteners
- Automotive: High-performance engine components, suspension parts, exhaust systems
- Medical devices: Surgical instruments, implants, dental equipment, MRI-compatible components
- Industrial equipment: Pump components, valve bodies, heat exchangers, chemical processing equipment
- Consumer products: High-end EDC tools, watch cases, bicycle components, sporting goods
CNC Machining Guidelines
Tool Selection
- Tool material: Carbide (YG/YW class) or coated carbide for optimal performance
- Tool geometry: Positive rake angle (5-15°), relief angle (8-12°)
- Nose radius: 0.4-0.8mm for fine finishing, 0.8-1.2mm for roughing
Recommended Cutting Parameters
| Operation | Cutting Speed (m/min) | Feed Rate (mm/rev) | Depth of Cut (mm) |
|---|---|---|---|
| Rough Turning | 80-120 | 0.2-0.4 | 2-4 |
| Finish Turning | 120-180 | 0.05-0.15 | 0.2-0.5 |
| Milling | 100-150 | 0.1-0.3 | 1-3 |
| Drilling | 60-100 | 0.1-0.2 | N/A |
Coolant & Lubrication
- Coolant type: Emulsion or synthetic coolant with EP additives
- Coolant pressure: ≥5 MPa, directed at cutting zone
- Avoid dry cutting: Always use coolant to prevent work hardening and tool wear
Heat Treatment (if applicable)
- Annealing: 650-750°C, air cool or furnace cool
- Solution treating: Per material specification
- Aging: As required for precipitation hardening alloys
Surface Finish Options
- As-machined: Ra 1.6-3.2 μm
- Fine turning: Ra 0.8-1.6 μm
- Polishing: Ra 0.2-0.4 μm (mirror finish)
- Bead blasting: Uniform matte finish
- Anodizing: For titanium alloys (various colors)