Key fact: Titanium costs 3–5x more to machine than aluminum and takes 4x longer per part. But for aerospace, medical implants, and high-performance applications, it’s irreplaceable — offering the highest strength-to-weight ratio of any metal (950 MPa at 4.43 g/cm³). Understanding titanium’s unique machining challenges is essential to controlling cost.
Titanium Grades for CNC Machining
Grade
Tensile (MPa)
Cost/kg
Machinability
Common Name
Best For
Grade 2
345
$20–30
★☆☆☆☆
Commercially Pure
Chemical equipment, heat exchangers
Grade 5 (Ti-6Al-4V)
950
$30–50
★☆☆☆☆
Ti-6-4, workhorse alloy
Aerospace, medical, racing, 80% of Ti parts
Grade 23 (Ti-6Al-4V ELI)
860
$40–60
★☆☆☆☆
Extra Low Interstitial
Surgical implants, fracture fixation
Ti-5553
1,200
$50–80
☆☆☆☆☆
Near-beta alloy
Landing gear, structural forgings
Why Titanium Is Difficult (and Expensive) to Machine
Challenge
Explanation
Cost Impact
Low thermal conductivity
Heat stays at the cutting edge — not carried away by chips like aluminum
Tool life reduced 70-80% vs aluminum
High chemical reactivity
Galls and welds to cutting tools at high temperature
Springs away from the tool, causing chatter and deflection
Requires rigid fixturing, slower feeds
Work hardening
Surface hardens during cutting if feed is too slow
Ruins parts if speeds/feeds not optimal
Stringy chips
Long continuous chips wrap around tools
Requires chip breakers, high-pressure coolant
Titanium vs Aluminum vs Steel: Machining Cost Multiplier
Material
Cutting Speed (m/min)
Tool Life (minutes)
Cost Multiplier vs Al 6061
Aluminum 6061
300–600
120–240
1.0x (baseline)
Stainless 304
60–120
45–90
1.5–2.0x
Titanium Ti-6Al-4V
30–60
15–30
3.0–5.0x
Cost Optimization Strategies for Titanium Parts
Minimize material removal. Start with near-net-shape stock (forgings, extrusions) instead of billet. Titanium material cost is high — reducing waste saves more than with aluminum.
Use high-pressure coolant (70+ bar). Through-tool coolant extends tool life 2–3x and improves surface finish on titanium.
Design for larger internal corner radii. Even more critical than with aluminum. Sharp corners in titanium cause tool chipping almost instantly.
Batch similar parts together. Tooling setup for titanium is slow; amortize across larger batches.
Consider 5-axis to reduce setups. Every re-fixturing of titanium risks tolerance loss and adds cost.