Guides / Cost
Why Titanium Parts Cost More to Machine and Where the Money Goes
Buyers who move a part from aluminium to titanium expect the price to rise. What surprises them is where the rise lands. It is rarely the shop’s hourly rate. It is five separate things, and only some of them are inside the shop’s control.
Here is the anatomy of a titanium quote, line by line.
The bar costs more, and most of it becomes chips
Titanium mill products cost several times what an equivalent aluminium bar costs per kilo, and the gap widens for ELI grades, corrosion grades and unusual sizes.
Then there is buy to fly: the ratio between the weight of stock you bought and the weight of the part you keep. The buy to fly calculator works it out for your part. Machining a bracket from a solid block can leave most of that block on the floor as swarf. In aluminium that waste is annoying. In titanium it is a line item.
This is the first place to look when a quote comes back high. Ask the shop what stock size it priced. Sometimes a different bar diameter, a plate instead of a block or a near net forging changes the number more than any cycle time saving ever will.
The machine runs slower, and that is physics
Titanium keeps heat in the cutting zone instead of carrying it away in the chip, and it work hardens if the tool rubs instead of cuts. Both push cutting data down.
| Material | Typical carbide surface speed | Relative |
|---|---|---|
| Aluminium 6061 | around 300 m/min and up | Reference |
| Stainless 316L | around 120 m/min | Slower |
| Titanium Grade 2 | around 80 m/min | Slower still |
| Titanium Grade 5, Ti-6Al-4V | around 50 m/min | Roughly six times slower than aluminium |
Treat these as typical starting points, not shop promises. Real numbers depend on the tool, the coolant and how rigid the setup is.
The consequence is simple. The same geometry occupies the machine for far longer in Grade 5 than in aluminium, and machine time is what a shop actually sells.
Tools wear faster
Titanium is abrasive and chemically reactive with most tool materials at cutting temperature. Inserts and end mills do not last the way they do in steel, and a shop that quotes titanium honestly has that consumption in its rate.
You cannot remove this line, but you can avoid inflating it. Deep pockets with long reach tools, sharp internal corners that force a small cutter and interrupted cuts all shorten tool life. A generous internal corner radius on the drawing is free to you and saves real money in the quote.
Rigidity, fixturing and thin walls
Titanium flexes away from the tool and springs back. On a thin wall that shows up as chatter, as a wall that measures differently loaded and unloaded, and as a finishing pass that has to be light and slow.
The answer is fixturing: soft jaws, vacuum plates, sacrificial tabs, sometimes a dedicated fixture for one part. That is engineering time and aluminium tooling billed once per order, which is why a quantity of one carries so much of it.
Tolerance, inspection and paperwork
The last line is the one buyers add without noticing.
- Every tolerance step tighter than you need adds a pass and a measurement.
- A first article inspection report is real hours on a CMM and a document nobody enjoys writing.
- A mill certificate to EN 10204 3.1, heat lot traceability and segregated storage are a process, not a photocopy.
None of this is padding. It is work you asked for. The useful move is to ask for exactly what your customer requires and nothing beyond it.
Ask for the quote in five lines
When a titanium quote looks high, do not ask for a discount. Ask the shop to split it:
- Material, including the stock size it priced
- Programming and fixturing, one time
- Machine time per part
- Finishing and outside operations
- Inspection and documentation
Now you can see which line is the problem, and each line has a different fix. Material is a stock or grade conversation. Programming is a quantity conversation. Machine time is a geometry conversation. Documentation is a requirements conversation.
Where a buyer can actually take cost out
- Check the grade. If the part does not need Ti-6Al-4V strength, Grade 2 is cheaper as bar and faster to cut.
- Check the stock. Ask whether a different starting size or a near net shape drops the material line.
- Tolerance only what matters. A general profile tolerance plus two called out features beats a tight block tolerance every time.
- Open the internal corners. A larger corner radius lets the shop use a bigger, stiffer cutter and a faster pass.
- Batch the repeats. If you will need the part again, say so. Fixturing paid once across two releases is cheaper than paying it twice.
What you will notice is that four of those five happen on the drawing, before anyone quotes. Titanium punishes vague RFQs harder than any other common machining material, and it rewards a specific one just as hard.
Frequently asked questions
How much more does titanium cost than aluminium to machine?
There is no single multiplier, and anyone who gives you one is guessing. The bar costs several times more per kilo, the machine runs at a fraction of the surface speed and tools wear faster. On a simple part the gap is mostly material. On a complex part it is mostly machine time.
Is Grade 2 cheaper to machine than Grade 5?
Yes, on both counts. Grade 2 bar costs less per kilo and it cuts faster with less tool wear. If the part does not need the strength of Ti-6Al-4V, quoting it in Grade 2 is the single easiest saving available.
Does ordering more parts bring the price per part down much?
It helps, but less than in aluminium. Programming and fixturing spread over the batch as usual, but material and cycle time stay stubborn because they are per part and both are high in titanium.
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