Titanium is a lightweight metal with an unusual reputation in manufacturing: it is roughly 45% lighter than steel, shrugs off corrosion even in saltwater and chemical environments, and is compatible with the human body. Those qualities put it in aerospace, automotive, medical, and marine products alike. Yet “titanium” is not one material — it is a family of grades, and each grade brings its own balance of strength, formability, and machinability.
This guide maps the titanium grades you are most likely to machine, explains what separates them, and helps you choose the right one for your part.
How Titanium Grades Are Classified
Titanium grades are distinguished by their alloying elements and by the levels of oxygen and nitrogen they contain. The classification system most widely used in industry comes from the American Society for Testing and Materials (ASTM). ASTM’s standard scheme gives engineers and fabricators a common language for specifying titanium, and it sorts the material into two broad families: commercially pure (CP) grades and alloyed grades.
Commercially Pure Titanium: Grades 1–4
Commercially pure titanium carries little or no intentional alloying; its properties come mainly from trace interstitial elements such as oxygen and iron. CP grades trade away peak strength in exchange for outstanding corrosion resistance, formability, and weldability.
Grade 1 — Maximum Formability
Grade 1 is the softest and most ductile titanium in the lineup. It bends, forms, and welds with ease, which is why it shows up in demanding chemical processing and marine engineering roles where corrosion resistance matters more than raw strength. Its typical tensile strength sits around 241 MPa (35 ksi) — modest on paper, but plenty for many harsh-service applications.
Because Grade 1 can be shaped without cracking, designers can produce detailed geometries and precise components from it. Equipment that lives alongside aggressive chemicals — reactors, heat exchangers, and piping systems — benefits directly: the material’s resilience extends service life and trims maintenance costs.
Typical Grade 1 parts include chemical processing equipment such as reactors, heat exchangers, and piping, plus marine hardware like fasteners, propellers, and fittings.
Grade 2 — The Industry Standard
Grade 2 is the most widely used titanium grade of all. It is stronger than Grade 1 — tensile strength up to 344 MPa (50 ksi) — while remaining easy to work with, giving it the best strength-to-workability balance in the pure family.
From a shop’s perspective, Grade 2 is forgiving: cutting, shaping, welding, and forming are all straightforward, which reduces tool wear and keeps production costs in check.
Like Grade 1, it resists corrosion — especially in oxidizing environments — so it appears throughout aerospace components, heat exchangers, and pressure vessels, as well as in marine and chemical processing hardware where reliability is non-negotiable.
Grade 3 — Strength With Moderate Flexibility
Grade 3 moves up the strength curve, reaching about 450 MPa (65 ksi) in tensile strength. It is chosen where parts must resist bending or deformation — think aircraft structures and heavy machinery, where safety and strength take priority.
It remains moderately formable — a little less flexible than Grade 2 — and welds well, making it a sensible pick for components that need real strength plus a reasonable amount of shaping.
Grade 4 — The Strongest Pure Grade
Grade 4 is the strongest commercially pure titanium, with tensile strength up to 552 MPa (80 ksi). That earns it a place in critical, high-load applications across aerospace and defense, where parts endure significant stress and strain.
The price is ductility: Grade 4 is noticeably harder to bend, form, and machine than the lower grades. Engineers who spec Grade 4 should plan the manufacturing route in advance and expect machining to be more demanding, so the finished part still performs as intended.
Alloyed Titanium Grades
When pure grades cannot supply enough strength or elevated-temperature performance, alloying elements are added. Alloyed titanium generally delivers higher strength and better heat resistance, at the cost of some workability.
Grade 5 (Ti-6Al-4V) — The Workhorse Alloy
Grade 5, better known as Ti-6Al-4V, is roughly 90% titanium, 6% aluminum, and 4% vanadium. It offers an outstanding strength-to-weight ratio and is the most common titanium alloy across aerospace, medical, and automotive manufacturing.
It can be heat-treated to push strength even higher for specific applications. Aircraft engines and landing gear lean on it; medical implants use it because the body accepts it well; automotive engineers reach for it wherever a part must be both light and strong.
Ti-6Al-4V is machinable but not forgiving. It demands sharp tooling, controlled speeds and feeds, and disciplined coolant use — otherwise tool wear accelerates quickly. The extra care pays off in durable, long-lived parts.
Grade 6 (Ti-5Al-2.5Sn) — For Welded, High-Temperature Service
Grade 6 (Ti-5Al-2.5Sn) pairs aluminum with tin to create an alloy that aerospace engineers value for its combination of light weight and strength.
It welds cleanly, producing robust joints that hold up under pressure and harsh conditions, and it keeps its corrosion resistance even when hot — both important traits for aircraft parts that operate in demanding environments.
Beyond aviation, Grade 6 appears in medical implants and prosthetics. It is biocompatible, and the precision with which it can be shaped lets implants be custom-fitted to individual patients, improving comfort and function.
Grade 7 (Ti-0.15Pd) — Maximum Corrosion Resistance
Grade 7 adds roughly 0.15% palladium to the mix. Palladium is a noble metal, and even that small addition dramatically improves corrosion resistance — particularly against reducing acids.
Mechanically, Grade 7 behaves much like Grade 2, so it machines and forms similarly, but it survives environments where Grade 2 would corrode. Chemical processing and marine applications are its natural habitat, anywhere long service life in aggressive media matters more than cost.
Machining Titanium: Key Considerations
Titanium is a demanding material to machine in any grade. Three factors dominate the conversation:
- Heat management: titanium holds heat at the cut zone, which accelerates tool wear and can distort the workpiece. Cutting speeds and feeds must be selected to keep temperatures in check.
- Tooling: carbide tools are the standard for titanium thanks to their hardness and wear resistance; coated carbide can stretch tool life further.
- Coolant: generous, well-directed coolant lowers cutting temperatures and prolongs tool life, making the process more efficient and results more consistent.
Getting these right is exactly the kind of discipline we apply across our CNC machining services at SHBD Metal — titanium parts are machined regularly in our workshop.
Choosing the Right Titanium Grade
Selecting a titanium grade is one of the most important decisions in a project, because the grade drives both performance and manufacturing cost. Corrosion-first applications in chemical or marine environments lean toward the CP grades — Grade 2 as the default, Grade 7 when acids are involved. Strength-critical aerospace or medical parts usually point to Grade 5, with Grade 6 for welded structures that see high temperatures. If formability is the priority, Grade 1 or Grade 2 win. Our materials engineering team can help you match a grade to your design requirements and budget.
Need a titanium part machined?
Get Instant QuoteFAQs
Which titanium grades are most common?
Grade 1, Grade 2, and Grade 5 are the grades you will meet most often. Grade 2 is the default commercially pure option, while Grade 5 (Ti-6Al-4V) is the dominant alloy for demanding applications.
How many grades of titanium are there?
Titanium is organized into four primary commercially pure grades (1–4) plus alloyed grades such as 5, 6, and 7. Each differs in composition, strength, and workability, which is what suits them to different applications across aerospace, medical, and industrial sectors.
What is the highest grade of titanium?
In the standard ASTM sequence, Grade 7 is the highest grade in this family. It pairs superior corrosion resistance with good strength, making it a top choice for aggressive chemical and marine environments.
What determines the grade of titanium?
A titanium grade is defined by its alloying elements, its purity, and the mechanical properties that result. Those factors decide everything from strength and ductility to corrosion resistance and machinability.