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China Titanium CNC Machining Factory: Quality Parts from Trusted Suppliers for Aerospace and Medical 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)
Overview: 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.
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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)
Overview: 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.
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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. | ||
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Frequently Asked Questions
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What is the difference between Titanium Grade 2 and Grade 5?
Titanium Grade 2 is commercially pure titanium, offering excellent corrosion resistance, formability, and biocompatibility, but with lower strength. Titanium Grade 5 (Ti-6Al-4V) is an alpha-beta alloy that provides significantly higher strength and fatigue resistance, making it suitable for structural and load-bearing applications such as aerospace components and surgical implants.
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Why is titanium considered difficult to machine compared to other metals?
Titanium has low thermal conductivity, which causes heat to concentrate at the cutting edge rather than dissipating through the chip. It also has a strong tendency to work-harden and chemically react with cutting tool materials at high temperatures. These factors lead to rapid tool wear and require specialized tooling, slower cutting speeds, and proper coolant strategies during CNC machining.
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Which titanium alloy is best suited for medical implant applications?
Titanium Grade 5 (Ti-6Al-4V) is the most widely used alloy for load-bearing surgical implants such as hip joints, bone plates, and dental implants due to its high strength, excellent biocompatibility, and corrosion resistance in bodily fluids. Titanium Grade 2 is preferred for non-load-bearing medical device housings and components where superior corrosion resistance is the primary concern.
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What surface finishes are available for CNC-machined titanium parts?
CNC-machined titanium parts can be finished with a variety of surface treatments, including as-machined (with visible tool marks), bead blasting for a uniform matte finish, anodizing for enhanced corrosion resistance and color coding, electropolishing for a smooth and clean surface, and passivation to further improve corrosion resistance — especially important for medical and aerospace applications.
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How does titanium's strength-to-weight ratio compare to steel and aluminum?
Titanium offers a strength-to-weight ratio superior to both steel and aluminum. While steel is stronger in absolute terms, titanium's density is approximately 60% that of steel, resulting in a much better specific strength. Compared to aluminum, titanium is roughly twice as strong while being only about 60% heavier, making it the preferred choice when both low weight and high strength are critical requirements.
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Can titanium alloys be welded after CNC machining?
Yes, titanium alloys can be welded, but they require strict precautions. Titanium reacts strongly with oxygen and nitrogen at elevated temperatures, so welding must be performed in an inert gas environment (typically argon or helium shielding) or in a vacuum chamber. Titanium Grade 2 offers the best weldability among the common grades, while Grade 5 (Ti-6Al-4V) is also weldable but may require post-weld heat treatment to restore optimal mechanical properties.
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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