Titanium alloys are widely used in aerospace, medical, automotive, marine, chemical processing, energy, defense and high-performance engineering applications because of their high strength-to-weight ratio, excellent corrosion resistance, high-temperature performance and biocompatibility.
However, titanium is also one of the more challenging engineering materials to manufacture.
Compared with aluminum and many steels, titanium has relatively low thermal conductivity, high chemical reactivity at elevated cutting temperatures, strong elastic recovery and a tendency to generate heat at the cutting zone. These characteristics can result in rapid tool wear, poor surface finish, chatter, dimensional problems and reduced tool life during CNC machining.
Selecting the correct titanium grade therefore requires consideration of more than tensile strength.
The alloy grade, metallurgical condition, operating temperature, corrosion environment, loading condition, manufacturing process, heat treatment and part geometry should all be considered during material selection and product design.
1. Titanium Alloy Grades Overview
Titanium alloys can broadly be divided into:
- Commercially Pure Titanium
- Alpha Titanium Alloys
- Near-Alpha Titanium Alloys
- Alpha-Beta Titanium Alloys
- Beta Titanium Alloys
Commercially pure titanium grades generally prioritize corrosion resistance and formability, while alloyed grades provide higher strength and improved performance for demanding structural applications.
ASTM B265, for example, covers titanium and titanium alloy sheet, strip and plate and includes commercially pure grades as well as alloys such as Grade 5 Ti-6Al-4V, Grade 9 Ti-3Al-2.5V and Grade 23 Ti-6Al-4V ELI.
Major Titanium Grades
| Grade | Common Designation | Alloy Type | Relative Strength | Corrosion Resistance | Machinability | Typical Applications |
|---|---|---|---|---|---|---|
| Grade 1 | CP Ti Grade 1 | Commercially Pure | Low | Excellent | Good | Chemical, medical, marine |
| Grade 2 | CP Ti Grade 2 / TA2 | Commercially Pure | Low-Medium | Excellent | Good | Chemical equipment, marine, medical |
| Grade 3 | CP Ti Grade 3 | Commercially Pure | Medium | Excellent | Fair-Good | Chemical and industrial equipment |
| Grade 4 | CP Ti Grade 4 | Commercially Pure | Highest CP Ti | Excellent | Fair | Aerospace, medical, industrial |
| Grade 5 | Ti-6Al-4V / TC4 | Alpha-Beta | Very High | Excellent | Difficult | Aerospace, medical, automotive |
| Grade 23 | Ti-6Al-4V ELI / TC4 ELI | Alpha-Beta | High | Excellent | Difficult | Medical implants, aerospace |
| Grade 6 | Ti-5Al-2.5Sn | Near-Alpha | High | Excellent | Difficult | Aerospace, elevated temperature |
| Grade 9 | Ti-3Al-2.5V / TA18 | Alpha-Beta | High | Excellent | Difficult | Tubes, aerospace, bicycle |
| Grade 12 | Ti-0.3Mo-0.8Ni | Alpha | Medium | Excellent | Fair | Chemical processing |
| Grade 7 | Ti-Pd | CP + Palladium | Low-Medium | Outstanding | Good | Chemical processing |
| Grade 11 | Ti-Pd | CP + Palladium | Low | Outstanding | Good | Chemical processing |
| Grade 19 | Ti-3Al-8V-6Cr-4Zr-4Mo | Beta | Very High | Good | Difficult | Aerospace |
| Grade 20 | Ti-3Al-8V-6Cr-4Zr-4Mo-Pd | Beta | Very High | Excellent | Difficult | Chemical/aerospace |
| Grade 21 | Ti-15Mo-3Al-2.7Nb-0.25Si | Beta | Very High | Good | Difficult | Aerospace |
| Grade 29 | Ti-6Al-4V ELI-Ru | Alpha-Beta | High | Excellent | Difficult | Medical/aerospace |
| Ti-6242 | Ti-6Al-2Sn-4Zr-2Mo | Near-Alpha | Very High | Excellent | Difficult | Aerospace, engines |
| Ti-6246 | Ti-6Al-2Sn-4Zr-6Mo | Alpha-Beta/Near-Alpha | Very High | Good | Very Difficult | Aerospace |
| Ti-5553 | Ti-5Al-5V-5Mo-3Cr | Beta | Extremely High | Good | Very Difficult | Landing gear, aerospace |
| Ti-10-2-3 | Ti-10V-2Fe-3Al | Beta | Extremely High | Good | Very Difficult | Aerospace structures |
The ASTM designation system confirms, for example, Grade 5 as Ti-6Al-4V, Grade 23 as Ti-6Al-4V ELI, Grade 9 as Ti-3Al-2.5V and Grade 6 as Ti-5Al-2.5Sn.
2. Commercially Pure Titanium
Commercially pure titanium is not completely pure titanium. Different grades contain controlled amounts of elements such as oxygen, iron, carbon and nitrogen.
The four most commonly referenced CP titanium grades are Grade 1, Grade 2, Grade 3 and Grade 4.
As the grade number increases, strength generally increases, while ductility and formability tend to decrease.
| Property | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
|---|---|---|---|---|
| Strength | Low | Medium-Low | Medium | Highest CP Ti |
| Ductility | Excellent | Excellent | Good | Good |
| Corrosion Resistance | Excellent | Excellent | Excellent | Excellent |
| Formability | Excellent | Excellent | Good | Good |
| Weldability | Excellent | Excellent | Excellent | Excellent |
| Machinability | Good | Good | Fair | Fair |
| Typical Use | Chemical/medical | Chemical/marine | Industrial | Aerospace/industrial |
Grade 2 Titanium
Grade 2 is one of the most widely used commercially pure titanium grades.
It provides an excellent balance of:
- Corrosion resistance
- Strength
- Formability
- Weldability
- Availability
Typical applications include:
- Chemical processing equipment
- Heat exchangers
- Marine components
- Medical components
- Pumps
- Valves
- Tanks
- Piping
Best choice when corrosion resistance is more important than maximum strength.
3. Grade 5 Titanium — Ti-6Al-4V / TC4
Ti-6Al-4V, commonly known as Grade 5 titanium or TC4, is the most important titanium alloy for general engineering and CNC machining.
ASTM B265 identifies Grade 5 as an alloy containing nominally 6% aluminum and 4% vanadium.
Key Properties
- Very high strength
- Excellent strength-to-weight ratio
- Excellent corrosion resistance
- Good fatigue performance
- Good biocompatibility
- Good temperature resistance
- Heat treatable
- Difficult to machine
Typical Applications
- Aerospace components
- Aircraft structures
- Engine components
- Medical implants
- Surgical instruments
- Automotive components
- Racing components
- Robotics
- High-performance CNC parts
Typical Material Characteristics
| Property | Ti-6Al-4V |
|---|---|
| Alloy Type | Alpha-Beta |
| Density | ~4.43 g/cm³ |
| Tensile Strength | Typically ~900 MPa or higher depending on condition |
| Yield Strength | Typically ~830 MPa or higher depending on condition |
| Elastic Modulus | ~110 GPa |
| Corrosion Resistance | Excellent |
| Machinability | Difficult |
| Weldability | Good with proper process control |
Actual mechanical properties must be specified according to the applicable material specification, product form, heat treatment and temper.
Why Is Ti-6Al-4V Difficult to Machine?
The major problems are:
- Low thermal conductivity
- Heat concentration at the cutting edge
- High chemical affinity at elevated temperatures
- High strength at machining temperatures
- Strong elastic recovery
- Work hardening
- Chatter sensitivity
- Relatively low cutting speeds
These characteristics can accelerate tool wear and make thermal control critical.
4. Grade 23 Titanium — Ti-6Al-4V ELI
Grade 23 is the Extra Low Interstitial version of Ti-6Al-4V.
It has the same basic alloy system as Grade 5 but uses tighter limits on interstitial elements.
ASTM B265 specifically identifies Grade 23 as Ti-6Al-4V with extra-low interstitial elements.
Typical Applications
- Medical implants
- Orthopedic components
- Surgical components
- Aerospace structures
- Cryogenic applications
Why Choose Grade 23 Instead of Grade 5?
Grade 23 is generally selected when requirements for:
- Ductility
- Fracture toughness
- Fatigue performance
- Biocompatibility
- Medical applications
are more demanding.
5. Grade 9 Titanium — Ti-3Al-2.5V
Grade 9 is commonly known as Ti-3Al-2.5V and is also widely associated with TA18.
ASTM B265 identifies Grade 9 as Ti-3Al-2.5V.
Characteristics
- Higher strength than CP titanium
- Excellent corrosion resistance
- Good ductility
- Good weldability
- Better formability than many high-strength titanium alloys
- Suitable for tubing
Typical Applications
- Aerospace tubing
- Hydraulic systems
- Bicycle frames
- Heat exchanger tubing
- Aircraft components
- Pressure tubing
Grade 9 is particularly useful when a combination of light weight, corrosion resistance, strength and tube formability is required.
6. Grade 6 Titanium — Ti-5Al-2.5Sn
Grade 6 is a near-alpha titanium alloy containing aluminum and tin.
It is mainly used when elevated-temperature performance and structural stability are important.
Typical Applications
- Aircraft components
- Aerospace structures
- Engine components
- High-temperature applications
Compared with Grade 5, Grade 6 is generally considered more specialized for elevated-temperature aerospace applications.
7. Grade 7 and Grade 11 Titanium
Grade 7 and Grade 11 are commercially pure titanium modified with palladium.
The addition of palladium improves corrosion resistance, particularly in reducing acidic environments.
ASTM B265 identifies Grade 7 and Grade 11 as unalloyed titanium with controlled palladium additions.
Typical Applications
- Chemical processing
- Heat exchangers
- Chemical tanks
- Piping
- Pumps
- Process equipment
These grades are much more about corrosion resistance than maximum mechanical strength.
8. Grade 12 Titanium
Grade 12 contains molybdenum and nickel additions.
It is designed for applications requiring improved corrosion resistance and somewhat higher strength than commercially pure titanium.
Typical Applications
- Chemical processing
- Heat exchangers
- Process piping
- Industrial equipment
- Corrosive environments
ASTM B265 specifies Grade 12 as a titanium alloy containing approximately 0.3% molybdenum and 0.8% nickel.
9. High-Strength Titanium Alloys
For demanding aerospace applications, several titanium alloys offer substantially higher strength than conventional Grade 5.
Important examples include:
- Ti-6Al-2Sn-4Zr-2Mo
- Ti-6Al-2Sn-4Zr-6Mo
- Ti-5Al-5V-5Mo-3Cr
- Ti-10V-2Fe-3Al
- Ti-3Al-8V-6Cr-4Zr-4Mo
These alloys can offer extremely high strength but often introduce additional challenges in machining, heat treatment and dimensional control.
10. Ti-5Al-5V-5Mo-3Cr — Ti-5553
Ti-5553 is a high-strength beta titanium alloy.
It is particularly important in aerospace applications such as landing gear and structural components.
MSC’s machining guidance notes that Ti-5553 can be substantially more difficult to machine than Ti-6Al-4V and recommends significantly lower cutting speeds, sharp tooling, light cutter engagement, dynamic or trochoidal toolpaths and high-pressure coolant.
Typical Applications
- Aircraft landing gear
- Aerospace structural components
- High-load components
- Heavy-duty aerospace hardware
Machining Characteristics
Ti-5553 requires:
- Low cutting speed
- Sharp cutting edges
- Rigid workholding
- Controlled cutter engagement
- High-pressure coolant
- Careful tool wear monitoring
A practical starting point may be around 60–80 SFM, or approximately 18–24 m/min, depending on tooling and machining conditions. This should be treated as a starting range rather than a universal production specification.
11. Titanium CNC Machining Parameters
This section is especially valuable for your website because it targets commercial searches such as:
- titanium CNC machining parameters
- Ti-6Al-4V cutting speed
- titanium milling parameters
- titanium turning parameters
- titanium machining speed
- titanium feed rate
- titanium carbide tooling
Ti-6Al-4V CNC Machining Starting Parameters
The following values should be presented as engineering starting points, not guaranteed production parameters.
Actual parameters depend on:
- Machine rigidity
- Tool diameter
- Tool material
- Tool coating
- Number of flutes
- Workpiece geometry
- Radial engagement
- Axial engagement
- Coolant pressure
- Machine spindle power
- Holder rigidity
- Part fixturing
Milling
| Parameter | Roughing Starting Range | Finishing Starting Range |
|---|---|---|
| Cutting Speed Vc | 30–60 m/min | 50–90 m/min |
| Feed per Tooth fz | 0.05–0.15 mm/tooth | 0.03–0.10 mm/tooth |
| Axial DOC ap | 1–2.5 mm | 0.2–0.8 mm |
| Radial DOC ae | 5–20% D | 5–15% D |
| Coolant | Flood / HPC | Flood / HPC |
| Tool | Carbide | Carbide |
| Tool Coating | Application-dependent | Application-dependent |
Published machining guidance for Ti-6Al-4V gives similar conservative cutting-speed ranges and emphasizes high-pressure coolant and avoiding excessively light cuts that encourage rubbing and work hardening.
Turning
| Parameter | Starting Range |
|---|---|
| Cutting Speed Vc | 40–60 m/min |
| Feed fn Roughing | 0.15–0.30 mm/rev |
| Feed fn Finishing | 0.05–0.15 mm/rev |
| DOC Roughing | 0.5–2.5 mm |
| DOC Finishing | 0.25–1.0 mm |
| Coolant | High-pressure flood |
| Tool | Sharp carbide |
These values are consistent with published Ti-6Al-4V turning guidance using carbide tooling and flood/HPC coolant.
12. Titanium Machining: Important Rule
A common mistake is to think:
“Titanium is hard, so simply use a very hard cutting tool and high cutting speed.”
This is not the correct approach.
Titanium’s machining difficulty is strongly related to heat generation and heat evacuation, not simply hardness.
Titanium has relatively poor thermal conductivity, meaning a large proportion of cutting heat remains concentrated near the tool-workpiece interface instead of being rapidly carried away by the chips.
Therefore:
Control heat rather than simply increasing cutting speed.
13. Major Titanium Machining Difficulties
13.1 Low Thermal Conductivity
Titanium does not conduct heat away from the cutting zone efficiently.
Consequences include:
- High cutting-edge temperature
- Rapid tool wear
- Edge chipping
- Built-up edge
- Surface damage
13.2 High Chemical Reactivity
At elevated temperatures, titanium can react with tool materials.
This can lead to:
- Adhesive wear
- Crater wear
- Tool welding
- Edge breakdown
13.3 Work Hardening
If the cutting tool rubs rather than cuts, the surface can become harder.
This creates a dangerous cycle:
Rubbing → Heat → Work Hardening → More Tool Wear → More Heat
Therefore, avoid dwelling and avoid excessively light cutting passes that simply rub the material.
13.4 Elastic Recovery
Titanium has significant elastic recovery.
During machining, the material can spring back against the tool, causing:
- Tool deflection
- Dimensional errors
- Chatter
- Poor surface finish
This becomes particularly important when machining thin walls.
13.5 Chatter
Titanium components often require:
- Rigid workholding
- Short tool overhang
- Rigid tool holders
- Optimized toolpaths
- Controlled radial engagement
Dynamic milling or trochoidal strategies can be useful for difficult titanium alloys such as Ti-5553.
14. Titanium Tooling Recommendations
For CNC machining titanium, carbide tooling is generally preferred.
Recommended Principles
- Use sharp cutting edges
- Use rigid tool holders
- Minimize tool overhang
- Maintain consistent chip load
- Avoid rubbing
- Use appropriate carbide grades
- Use suitable coatings where validated
- Use high-pressure coolant where available
- Monitor tool wear closely
For difficult beta titanium alloys, published industrial guidance specifically recommends sharp uncoated or PVD-coated tools, light cutter engagement and high-pressure coolant.
15. Titanium Coolant Requirements
Coolant is an important part of titanium machining.
Recommended strategies include:
- High-pressure flood coolant
- Through-tool coolant
- Continuous coolant delivery
- Good chip evacuation
The most important principle is:
Do not allow the cutting zone to repeatedly heat up and cool down unnecessarily.
For high-performance titanium machining, high-pressure coolant can substantially improve heat control and chip evacuation. Published machining guidance for Ti-6Al-4V recommends HPC/flood coolant, while some shop guidance specifies pressures of approximately 70 bar or higher for aggressive machining setups.
The actual coolant pressure should be selected according to the machine, toolholder, tooling and process.
16. Titanium Product Design Guidelines
Titanium parts should be designed differently from aluminum parts.
16.1 Avoid Excessively Thin Walls
Thin titanium walls are susceptible to:
- Deflection
- Chatter
- Thermal deformation
- Dimensional variation
- Tool pressure
Whenever possible, increase wall thickness or add ribs.
16.2 Use Generous Internal Radii
Sharp internal corners increase:
- Stress concentration
- Cutting forces
- Tool wear
- Machining time
Use a radius compatible with the cutting tool.
For CNC machining:
Larger internal radii generally improve both manufacturability and tool life.
16.3 Avoid Deep Narrow Cavities
Deep cavities create:
- Long tool overhang
- Poor rigidity
- Difficult chip evacuation
- Increased vibration
- Poor coolant access
A wider and shallower cavity is usually easier to machine than a deep narrow cavity.
16.4 Minimize Extreme Tool Reach
A long end mill may deflect significantly when machining titanium.
Design the component so that:
- Shorter tools can be used
- Tool access is straightforward
- Deep pockets are avoided
- Internal corners are accessible
17. Titanium Design for CNC Machining
| Design Factor | Recommended Approach |
|---|---|
| Wall Thickness | Avoid unnecessarily thin walls |
| Internal Corner | Use generous radius |
| Pocket Depth | Avoid excessive depth-to-width ratio |
| Tool Reach | Minimize tool overhang |
| Holes | Avoid unnecessary deep small holes |
| Threads | Provide adequate engagement length |
| Sharp Corners | Avoid where possible |
| Thin Ribs | Increase thickness where possible |
| Large Flat Areas | Consider distortion and stress relief |
| Fixturing | Provide stable clamping surfaces |
| Datum Features | Include accessible datum surfaces |
| Surface Finish | Specify only what is functionally necessary |
18. Titanium Thread Design
Threading titanium requires particular attention because of its tendency toward:
- Galling
- Adhesive wear
- Heat generation
- Tool damage
For threaded titanium components:
- Avoid unnecessarily tight tolerances
- Use appropriate thread geometry
- Consider surface treatment
- Provide adequate engagement
- Avoid excessive preload
- Consider galvanic compatibility with mating fasteners
For frequently assembled components, the mating material and lubrication strategy should also be considered.
19. Titanium Hole Design
Deep holes are among the more difficult features to machine in titanium.
Potential problems include:
- Heat accumulation
- Chip evacuation
- Drill wear
- Hole size variation
- Tool breakage
For deep holes:
- Use appropriate pecking strategy
- Maintain coolant flow
- Control cutting speed
- Avoid excessive feed
- Use suitable carbide drills where appropriate
- Consider gun drilling or specialized processes for extreme depth
20. Titanium Surface Treatment
Titanium can be used without coating because of its naturally protective oxide film, but surface treatment can be beneficial depending on the application.
Potential treatments include:
- Anodizing
- Micro-arc oxidation
- PVD coatings
- Passivation/cleaning
- Polishing
- Shot peening
- Specialized wear-resistant coatings
The correct treatment depends on whether the primary requirement is:
- Corrosion resistance
- Wear resistance
- Appearance
- Biocompatibility
- Fatigue performance
- Friction reduction
21. Titanium Alloy Selection by Application
| Application | Recommended Grades | Main Reason |
|---|---|---|
| General corrosion-resistant components | Grade 2 | Excellent corrosion resistance |
| Chemical equipment | Grade 2 / 7 / 12 | Corrosion resistance |
| Marine applications | Grade 2 / 5 | Excellent seawater resistance |
| CNC machining | Grade 5 | Strength + availability |
| Aerospace structures | Grade 5 / 23 / 6 / 6242 | Strength-to-weight ratio |
| Medical implants | Grade 23 | ELI + biocompatibility |
| Tubing | Grade 9 | Strength + formability |
| Aircraft landing gear | Ti-5553 | Very high strength |
| High-temperature aerospace | Ti-6242 | High-temperature capability |
| High-strength aerospace | Ti-5553 / Ti-10-2-3 | Very high strength |
| Chemical processing | Grade 7 / 12 | Corrosion resistance |
| Bicycle components | Grade 9 / 5 | Lightweight + strength |
| Racing components | Grade 5 | High specific strength |
| Hydraulic tubing | Grade 9 | Strength + formability |
22. Titanium Alloy Selection by Environment
| Operating Environment | Recommended Considerations |
|---|---|
| Seawater | Grade 2 / Grade 5 |
| Chloride Environment | Grade 2 / Grade 7 / Grade 12 |
| Acidic Chemical Environment | Grade 7 / Grade 12 |
| High Temperature | Ti-6242 / specialized near-alpha alloys |
| Aerospace Structural | Grade 5 / Grade 23 / beta alloys |
| Medical | Grade 23 |
| Cyclic Loading | Grade 5 / Grade 23 depending on specification |
| High Strength | Grade 5 / Ti-5553 / Ti-10-2-3 |
| Lightweight Structure | Grade 5 |
| Welded Structure | Grade 2 / Grade 5 / Grade 9 |
23. Titanium Alloy Failure Factors
Titanium is highly corrosion resistant, but this does not mean titanium components cannot fail.
Common failure mechanisms include:
Mechanical Failure
- Tensile overload
- Fatigue
- Buckling
- Fracture
- Stress concentration
Manufacturing-Related Failure
- Tool marks
- Surface damage
- Residual stress
- Dimensional distortion
- Poor heat treatment
- Incorrect machining parameters
Environmental Failure
- Galvanic corrosion
- Hydrogen-related effects
- High-temperature oxidation
- Fretting
- Corrosion-fatigue
Design-Related Failure
- Sharp corners
- Thin walls
- Excessive stress concentration
- Poor load paths
- Insufficient thread engagement
- Poor joint design
24. Titanium Galvanic Corrosion
Titanium itself has excellent corrosion resistance, but galvanic corrosion can occur when titanium is electrically connected to another metal in an electrolyte.
Potential mating materials include:
- Aluminum
- Carbon steel
- Stainless steel
- Copper alloys
For assemblies exposed to:
- Seawater
- Salt spray
- High humidity
- Chemical environments
consider:
- Electrical isolation
- Appropriate coatings
- Washers
- Bushings
- Sealants
- Compatible fasteners
25. Titanium vs Aluminum vs Stainless Steel
This is another excellent SEO comparison topic.
| Property | Titanium | Aluminum | Stainless Steel |
|---|---|---|---|
| Density | Low | Very Low | High |
| Strength-to-Weight | Excellent | Good | Good |
| Corrosion Resistance | Excellent | Good | Excellent |
| Heat Resistance | Excellent | Fair | Excellent |
| Machinability | Difficult | Easy | Moderate-Difficult |
| Cost | High | Low | Medium |
| Medical Applications | Excellent | Limited | Excellent |
| Aerospace | Excellent | Excellent | Good |
| Marine | Excellent | Good | Excellent |
| CNC Cost | High | Low | Medium-High |
The primary reason to choose titanium is usually not simply “high strength.”
It is the combination of:
Low density + high strength + corrosion resistance + temperature capability + specialized biological compatibility
that makes titanium attractive for demanding applications.
26. Quick Titanium Grade Selection Guide
| If You Need… | Consider… |
|---|---|
| Best general-purpose titanium | Grade 5 / Ti-6Al-4V |
| Excellent corrosion resistance | Grade 2 |
| Medical implant material | Grade 23 |
| Titanium tubing | Grade 9 |
| Chemical processing | Grade 2 / 7 / 12 |
| Maximum CP titanium strength | Grade 4 |
| High-strength aerospace | Grade 5 / 705-type beta alloys |
| Very high strength | Ti-5553 / Ti-10-2-3 |
| High-temperature aerospace | Ti-6242 |
| Good formability + strength | Grade 9 |
| High strength CNC machining | Grade 5 |
| Seawater applications | Grade 2 / Grade 5 |
| Aerospace landing gear | Ti-5553 |
27. Titanium CNC Machining Design Checklist
Before sending a titanium component for CNC machining, engineers should review:
Material
- Correct titanium grade
- Correct temper / heat treatment
- Required material certification
- Applicable ASTM / AMS / EN specification
Design
- Wall thickness is sufficient
- Internal radii are adequate
- Deep cavities are minimized
- Tool access is adequate
- Sharp corners are avoided
- Stress concentrations are minimized
Manufacturing
- Appropriate carbide tooling
- Rigid workholding
- Short tool overhang
- Controlled cutting speed
- Adequate feed rate
- Sufficient coolant
- Chip evacuation strategy
Quality
- Critical dimensions identified
- Surface finish requirements defined
- Heat treatment specified
- Surface treatment specified
- Inspection requirements defined
28. Final Titanium Alloy Selection Guide
There is no single “best” titanium alloy for every application.
The correct grade depends on the balance between:
Strength
- Weight
- Corrosion Resistance
- Temperature
- Fatigue
- Manufacturability
- Cost
- Application Requirements
For general high-strength applications, Ti-6Al-4V Grade 5 is often the starting point.
For corrosion-focused applications, Grade 2 is a common choice.
For medical applications requiring extra-low interstitial titanium, Grade 23 Ti-6Al-4V ELI is an important option.
For titanium tubing, Grade 9 Ti-3Al-2.5V offers a useful combination of strength, corrosion resistance and formability.
For extreme aerospace strength requirements, alloys such as Ti-5553 and Ti-10V-2Fe-3Al may be considered.
The final material should always be selected according to the applicable material specification, product form, heat treatment, operating environment and engineering requirements.
Titanium CNC Machining: What Engineers Should Know
Titanium offers exceptional engineering performance, but it requires a different manufacturing approach from aluminum and conventional steels.
The key principles are:
Control heat.
Maintain a consistent chip load.
Avoid rubbing.
Use rigid tooling and workholding.
Keep tool engagement controlled.
Use appropriate coolant delivery.
Design the component for manufacturability.
Select the alloy according to the actual operating environment rather than strength alone.
For custom titanium components, the combination of material selection, DFM design, CNC process planning, tooling strategy, coolant control and inspection is critical to achieving repeatable dimensional accuracy and surface quality.

wade@axiprecision.com
+8613686195573