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China Titanium CNC Machining Factory: Top Suppliers for Custom Precision Parts and Prototypes
Titanium Alloy CNC Machining
Titanium is a high-performance metal with strength comparable to many steels but a density only about 60% that of steel. This unparalleled strength-to-weight ratio, combined with its outstanding corrosion resistance in harsh environments (such as seawater and bodily fluids), makes it the ideal choice for demanding applications. Our Instant Quoting Engine supports CNC machining for various titanium alloys.
Titanium Grade 2 (CP Ti, Gr.2)
Titanium Grade 2 is commercially pure titanium, offering the best formability, weldability, and excellent corrosion resistance among titanium alloys. While its strength is lower than Grade 5, its superb biocompatibility and corrosion resistance make it widely popular in chemical processing, marine, and medical (non-implant) fields.
Typical Applications
Chemical processing equipment components, piping for desalination systems, medical device housings, non-load-bearing aerospace structures.
Titanium Grade 2 Typical Properties Annealed
| Property | Value | Notes |
|---|---|---|
| Yield Strength (MPa) | ≥ 275 | Good balance of ductility and strength |
| Tensile Strength (MPa) | ≥ 345 | — |
| Elongation at Break (%) | ≥ 20 | Excellent ductility |
| Hardness (Vickers) | ~ 150 | — |
| Density (g/cm³) | 4.51 | ~40% lighter than steel |
| Generalized values. Specific properties depend on heat treatment and specification. | ||
Titanium Grade 5 (Ti-6Al-4V, Gr.5)
Titanium Grade 5 (Ti-6Al-4V) is the most commonly used and representative alpha-beta titanium alloy, often called the "workhorse alloy." It provides an extremely high strength-to-weight ratio and excellent fatigue strength while maintaining good corrosion resistance, making it the primary choice for critical applications requiring both lightweight and high strength.
Typical Applications
Aerospace structural components (airframe, landing gear), aircraft engine parts, high-performance automotive racing components, surgical implants (joints, bone plates), high-end sporting equipment.
Titanium Grade 5 Typical Properties Solution Treated & Aged
| Property | Value | Notes |
|---|---|---|
| Yield Strength (MPa) | ≥ 828 | Strength significantly exceeds Grade 2 |
| Tensile Strength (MPa) | ≥ 895 | — |
| Elongation at Break (%) | ≥ 10 | Maintains good plasticity at ultra-high strength |
| Hardness (Rockwell C) | ~ 36 | — |
| Density (g/cm³) | 4.43 | Similar to Grade 2 |
| Generalized values. Specific properties depend on heat treatment and specification. | ||
Frequently Asked Questions
What is the main difference between Titanium Grade 2 and Grade 5?
Grade 2 is commercially pure titanium, prized for its excellent formability, weldability, and corrosion resistance, but with lower strength. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy offering significantly higher strength and fatigue resistance, making it suitable for structural and load-bearing applications.
Is titanium difficult to CNC machine compared to steel?
Yes, titanium is generally more challenging to machine than steel. It has low thermal conductivity, which causes heat to concentrate at the cutting tool, and it tends to work-harden during machining. Specialized tooling, slower cutting speeds, and proper coolant strategies are required for effective titanium CNC machining.
Which titanium grade is best for medical implants?
Titanium Grade 5 (Ti-6Al-4V) is the most widely used alloy for load-bearing surgical implants such as hip joints and bone plates, due to its high strength and proven biocompatibility. Grade 2 is also used in non-load-bearing medical device housings thanks to its excellent biocompatibility and corrosion resistance.
How does titanium's weight compare to steel and aluminum?
Titanium has a density of approximately 4.43–4.51 g/cm³, which is about 40% lighter than steel (≈7.85 g/cm³) but roughly 60% heavier than aluminum (≈2.70 g/cm³). However, titanium offers a far superior strength-to-weight ratio compared to both materials in most engineering applications.
What surface finishes are available for CNC-machined titanium parts?
CNC-machined titanium parts can be finished in several ways, including as-machined, bead blasting, anodizing (for color and enhanced corrosion resistance), passivation, polishing, and electropolishing. The appropriate finish depends on the application's functional and aesthetic requirements.
Can titanium alloys be used in high-temperature environments?
Titanium alloys perform well at moderate elevated temperatures. Grade 5 (Ti-6Al-4V) retains good mechanical properties up to approximately 300–400°C (572–752°F). For extreme high-temperature applications, specialized titanium alloys or alternative materials such as nickel superalloys may be more appropriate.
Finishes and Post-Processing Options
The zinc alloy substrate is highly suitable for various surface treatments to enhance decoration, protection, or functionality:
Electroplating: Such as chrome, nickel, gold, or silver plating, providing a highly decorative appearance, excellent wear and corrosion resistance. This is the most common choice.
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Passivation or Chromate Conversion Coating:
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Powder Coating:
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Painting:
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Physical Vapor Deposition (PVD):
Design and Machining Considerations
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Process Selection:
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Design Considerations:
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Material Selection:
Zamak 3 and 5 are suitable for the vast majority of general-purpose parts requiring good appearance and strength; ZA-8 is better for wear and bearing applications; for making rapid tooling, choose specialized alloys like Kirksite.
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