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China Titanium CNC Machining Suppliers - Quality Parts from a Certified Factory for Aerospace, Medical, and Industrial Applications
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) Grade 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) Grade 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 and 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 difference between Titanium Grade 2 and Grade 5 for CNC machining?
Titanium Grade 2 is commercially pure titanium with excellent formability, weldability, and corrosion resistance, but lower strength. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy offering significantly higher strength (yield strength ≥828 MPa vs. ≥275 MPa) and superior fatigue performance, making it preferred for structural and load-bearing applications. Grade 2 is generally easier to machine, while Grade 5 requires more careful tooling and cutting parameters.
Why is titanium considered difficult to CNC machine?
Titanium has low thermal conductivity, which causes heat to concentrate at the cutting edge rather than dissipating through the chips or workpiece. This leads to rapid tool wear. Additionally, titanium's tendency to work-harden and its chemical reactivity with cutting tools at elevated temperatures require the use of sharp carbide tooling, appropriate cutting speeds, and generous coolant application.
Which titanium alloy is best for medical implant applications?
Titanium Grade 5 (Ti-6Al-4V) is the most widely used alloy for load-bearing surgical implants such as hip and knee joints and bone plates, due to its high strength and excellent biocompatibility. For non-implant medical devices and housings where corrosion resistance and biocompatibility are paramount but high strength is less critical, Titanium Grade 2 is also a popular choice.
What surface finishes are available for CNC-machined titanium parts?
CNC-machined titanium parts can be delivered in a variety of surface finishes, including as-machined, bead blasting, anodizing (Type II or Type III), electropolishing, and passivation. The choice depends on the application — for example, anodizing enhances corrosion resistance and can add color coding, while electropolishing is preferred for medical and food-grade components requiring ultra-smooth, contamination-resistant surfaces.
How does the strength-to-weight ratio of titanium compare to steel and aluminum?
Titanium offers a strength-to-weight ratio superior to both steel and aluminum. Its density is approximately 4.5 g/cm³ — about 40% lighter than steel (~7.85 g/cm³) — while matching or exceeding the strength of many steel grades. Compared to aluminum, titanium is about 60% heavier but typically two to three times stronger, making it the preferred choice when maximum strength with minimum weight is required in critical applications.
What tolerances can be achieved when CNC machining titanium alloys?
With proper tooling and process control, CNC machining of titanium alloys can achieve tight dimensional tolerances of ±0.01 mm or better for precision features. Standard tolerances typically fall in the ±0.05–0.125 mm range. Surface roughness values of Ra 0.8–3.2 µm are commonly achievable in the as-machined state, with finer finishes possible through additional post-processing steps such as grinding or polishing.
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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