A Guide to Titanium CNC Machining
Last updated : 2026/7/22
Key Takeaways
Titanium combines lightweight properties with exceptional strength and corrosion resistance for demanding applications.
Its biocompatibility and resistance to seawater corrosion make it ideal for medical, aerospace, and marine components.
Titanium is difficult to machine and requires specialized tooling and machining techniques to achieve high precision.
Overview
Pure titanium has a specific gravity of 4.51, making it a relatively light metal—about 60% the weight of steel for the same volume. Titanium alloys, with added metals like molybdenum, offer excellent strength and corrosion resistance, and are used in parts for more demanding conditions. Due to their high biocompatibility and low thermal conductivity, they are also popular in medical devices and camping gear.
In machining, titanium is classified as a difficult-to-cut material because of its unique properties. The main five characteristics of titanium are as follows:
Lightweight
High specific strength
High corrosion resistance
Low thermal conductivity
Difficult to machine
Characteristics of Titanium
Titanium is valued for being lightweight, strong, corrosion resistance, and aesthetically pleasing. It surpasses many other metals in strength and corrosion resistance, making it a popular material not only in industrial parts but also in everyday products such as tableware.
There are two primary types: pure titanium (purity of 99.999% or higher) and titanium alloys (created by adding other metals like molybdenum).
Titanium alloys are non-magnetic and generally stronger and more corrosion resistant than pure titanium.
Lightweight
Titanium alloys are lighter than most commonly used metals. Compared to aluminum alloys, however, titanium is about 1.6× heavier.
Titanium | Stainless Steel | Aluminum Alloy | Copper | |
|---|---|---|---|---|
Specific Gravity | 4.43 | 7.6-8.1 | 2.6-2.8 | 8.9 |
Weight Comparison | ~1.8 times heavier | ~0.6 times heavier | ~2 times heavier |
High Specific Strength
Titanium alloys have about three times the specific strength of stainless steel. They maintain this advantage even at temperatures up to 600 °C (1,112 °F).
Pure Titanium | Titanium Alloy (6AL-4V) | Stainless Steel (SUS304) | Aluminum Alloy (A5052P) | Copper | |
|---|---|---|---|---|---|
Tensile Strength (N/mm2) | 393 | 999 | 588 | 212 | 213 |
Specific Strength | 87.1 | 225.5 | 74.4 | 75.7 | 23.9 |
High Corrosion Resistance
Titanium is especially resistant to corrosion in seawater environments, thanks to a thin but robust titanium oxide passive film that forms naturally on its surface. Once formed, this film strongly bonds with the surface and is extremely difficult to separate, effectively shielding the underlying metal from rust and corrosive damage. This resistance to chloride ions gives titanium superior performance compared to stainless steel in similar conditions.
Usable in Applications Involving Human Contact
Titanium alloys are non-toxic, highly biocompatible, and less likely to trigger metal allergies. Because of this, they are often used in medical implants and devices. Titanium also has the rare ability to bond directly with bone without rejection.
The titanium oxide that forms on its surface when exposed to air also has high antibacterial properties, making it an excellent material for items like tableware.
Low Thermal Conductivity
Titanium alloys have a thermal conductivity of about 7.5 W/m·K, which is roughly half that of stainless steel. Heat moves slowly through titanium, which influences its machinability.
Types of Titanium
Pure titanium is classified into JIS Types 1 through 4, with higher numbers indicating greater hardness.
In addition to pure titamium, there are titanium alloys containing added metals which incorporate stabilizing elements such as aluminum, molybdenum, vanadium, and niobum, which enhyance strength and corrosion resistance.
Titanium Alloys:
Alpha (α)-Titanium Alloy: common in aerospace; very strong but difficult to process
Beta (β)-Titanium Alloy: nearly as strong as 64 alloy but with better cold workability.
Alpha-beta (α-β) Titanium Alloy
Heat-Resistant Titanium Alloy
Biocompatible Titanium Alloy
Precautions for Titanium Machining
While titanium is strong and corrosion resistant, its very properties make it a challenging material to cut. Common machining issues include:
Low Thermal Conductivity: Heat builds up in the tool and workpiece, accelerating tool wear.
Chemically Reactive: Cutting heat intensifies reactivity, further wearing tools.
Continuous Deformation: Chips form under fluctuating resistance, causing chipping and excessive wear at the cutting edge.
Low Young's Modulus: Workpieces deform easily, leading to reduced accuracy and vibration (chatter), especially in thin parts.
Titanium CNC Machining at Yumoto Electric
Yumoto Electric delivers high-quality components fast, worldwide. We provide precision machining for a wide range of metals using milling, turning, and specialized metal processing. We have experience with over 200 materials including aluminum alloys, stainless steel, molybdenum, and titanium.
If you’re unsure about material selection or machining methods, we offer complimentary consultations to help optimize your design and production. For any questions, please feel free to contact us.
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