How to Choose the Best Titanium Grade for Your Application
Nov 26, 2025
Why There Is No Single Best Titanium Grade
Titanium is not one material but a family of grades, each engineered for a different balance of strength, corrosion resistance, formability and cost. The best grade for a project depends on the service environment, the mechanical loads involved, and the fabrication route the manufacturer plans to use. This guide compares the nine grades most often specified by buyers - commercially pure Grades 1 to 4 and alloys Grades 5, 7, 9, 11 and 12 - so you can shortlist the right one before requesting a quotation.
Commercially Pure Titanium Grades 1-4
Commercially pure (CP) titanium grades are unalloyed titanium containing small, controlled amounts of oxygen, iron, carbon and nitrogen. Oxygen is the principal strengthener: as the oxygen content rises from Grade 1 to Grade 4, tensile strength increases while ductility decreases. All four grades resist corrosion well in seawater, chloride solutions and oxidising media, and all are readily weldable and formable.
| Grade | Typical tensile strength (MPa) | Key trait | Typical use |
|---|---|---|---|
| Grade 1 | 240 | Softest, most formable | Chemical anodes, heat-exchanger linings, deep-drawn parts |
| Grade 2 | 345 | Best all-round CP grade | Heat exchangers, desalination plants, marine architecture |
| Grade 3 | 440 | Higher strength than Grade 2 | Pressure vessels, marine hardware, chlorate manufacture |
| Grade 4 | 550 | Strongest CP grade | Fasteners, surgical hardware, cryogenic vessels |
One clarification is worth making here: Grade 2 is sometimes described in online articles as a beta alloy. That is incorrect. Grade 2 is alpha-phase commercially pure titanium with a hexagonal close-packed structure at room temperature. True beta alloys, such as Ti-3Al-8V-6Cr-4Mo-4Zr, are deliberately alloyed with molybdenum, vanadium and other beta stabilisers and behave very differently.
Titanium Alloys: Grades 5, 7, 9, 11 and 12
Where CP grades cover the low-to-medium strength range, alloyed grades extend the envelope with higher strength, better elevated-temperature performance or enhanced corrosion resistance in reducing media.
Grade 5 (Ti-6Al-4V) - the workhorse alpha-beta alloy, alloyed with 6% aluminium and 4% vanadium. Minimum tensile strength of 895 MPa in the annealed condition per ASTM B348, good fatigue resistance, and service capability up to roughly 400°C. First choice for aerospace, high-performance fasteners, marine shafts and medical instruments.
Grade 7 - essentially Grade 2 plus a small palladium addition (0.12-0.25%). The palladium suppresses corrosion in reducing acids such as hydrochloric and sulphuric acid. Specified for chemical processing, desalination and power-generation heat exchangers.
Grade 9 (Ti-3Al-2.5V) - a lean alpha-beta alloy with strength between Grades 4 and 5 but superior formability and weldability. Popular for hydraulic tubing, aerospace piping, bicycle frames and offshore instrumentation lines.
Grade 11 - Grade 1 plus palladium. The most formable corrosion-resistant option; used for chemical processing tubing and anode baskets in chloride environments.
Grade 12 (Ti-0.3Mo-0.8Ni) - a near-alpha alloy whose molybdenum-nickel addition gives crevice-corrosion resistance superior to CP grades in hot chloride and reducing environments, plus good strength at elevated temperature. Widely used for heat-exchanger and condenser tubing.
Grade-by-Grade Selection Guide
| Your priority | Recommended grade | Why |
|---|---|---|
| Deep forming or cold working | Grade 1 or Grade 2 | Highest ductility and lowest yield strength |
| Welded chemical equipment | Grade 2 or Grade 7 | Excellent weldability; Grade 7 adds acid resistance |
| Heat exchangers, condensers | Grade 2 or Grade 12 | Proven corrosion performance; Grade 12 for crevice risk |
| High strength-to-weight ratio | Grade 5 (Ti-6Al-4V) | 895 MPa minimum tensile strength at 60% of steel density |
| Hydraulic or aerospace tubing | Grade 9 | Formable, weldable, stronger than CP grades |
| Reducing acids, aggressive chlorides | Grade 7 or Grade 11 | Palladium-stabilised passivity |
| Elevated-temperature service | Grade 5 or Grade 12 | Retain strength and creep resistance above 300°C |
How to Specify Titanium Correctly
When you specify titanium for procurement, name the grade and the governing standard together, for example Grade 2 seamless tube to ASTM B338, Grade 5 bar to ASTM B348, or Grade 5 plate to ASTM B265. Common reference standards include ASTM B265 (sheet, strip and plate), ASTM B348 (bar and billet), ASTM B338 (condenser and heat-exchanger tube), ASTM B861 (seamless pipe) and ASTM B862 (welded pipe). The same grades are covered by international equivalents such as ISO 5832-3 for implant alloy and GB/T 3620.1 for Chinese designation mapping. Always state the delivery condition (annealed, solution-treated and aged) and the required surface finish, because both affect price and performance.
Common Misconceptions
Higher grade number does not mean better material. Grade 5 is an alloy, not a refinement of Grade 4; the numbering simply follows the ASTM listing order.
Grade 2 is not a beta alloy. As noted above, it is alpha-phase CP titanium.
The strongest grade is not always the right grade. Selecting Grade 5 for a part that only needs Grade 2 adds cost and makes forming and welding more difficult.
CP grades are not corrosion-proof. They excel in oxidising and chloride media but are attacked by reducing acids such as concentrated hydrochloric acid unless alloyed (Grade 7/11/12).
FAQ
Which titanium grade is the strongest?
Among the grades covered here, Grade 5 (Ti-6Al-4V) offers the highest strength, with a minimum tensile strength of 895 MPa in the annealed condition; heat-treated conditions are stronger still. Within the commercially pure family, Grade 4 is the strongest at roughly 550 MPa minimum.
Is Grade 2 or Grade 5 better for seawater service?
For most seawater components, Grade 2 is the preferred and more economical choice because CP titanium is essentially immune to general corrosion in seawater. Grade 5 is chosen when the part also carries high mechanical loads, but galvanic coupling and crevice geometry must then be managed carefully.
What is the difference between Grade 2 and Grade 7 titanium?
Grade 7 is Grade 2 with a small palladium addition (0.12-0.25%). The palladium widens the passive range so the alloy resists reducing acids, such as dilute hydrochloric and sulphuric acid, in which plain Grade 2 would corrode.
Can Grade 9 replace Grade 5 in tubing applications?
Often yes. Grade 9 (Ti-3Al-2.5V) has roughly 20% lower strength than Grade 5 but is significantly easier to cold form and weld, which is why it dominates aircraft hydraulic tubing. Strength-critical tubing should still use Grade 5 or a thicker wall of Grade 9.
Which titanium grade is best for medical implants?
For implants, the governing standards matter more than the marketing name: ASTM F67 for commercially pure grades and ASTM F136 for Ti-6Al-4V ELI (extra-low interstitial, also ISO 5832-3). Grade 23, the ELI version of Grade 5, is the most widely specified for load-bearing orthopaedic implants because of its combination of strength and toughness.
Does a higher grade cost more?
Not always. Grade 5 alloy is often cheaper per kilogram than Grade 7 because the palladium content of Grade 7 makes it expensive. Pricing depends on the alloying elements, the product form and the certification required, not on the grade number.
