The Short Answer
Yes. Grade 2 titanium is widely regarded as a high-quality material, especially for applications that need a balance of formability, corrosion resistance and moderate strength. It is one of the most commonly used grades of commercially pure (CP) titanium, standardized as UNS R50400 under ASTM B265 (sheet, strip and plate) and ASTM B348 (bar and billet), and its reliability and versatility are well established across marine, chemical and medical industries.
Why Grade 2 Titanium Is Considered High Quality
Grade 2's quality comes from four attributes. It offers excellent corrosion resistance in seawater, oxidizing acids and chloride solutions, which suits marine hardware, chemical processing and medical equipment. It is ductile and formable, allowing bending, welding and cold working into complex components. It is biocompatible, non-toxic and well tolerated by human tissue, making it a trusted choice for orthopedic screws and dental fixtures. And it is more economical than alloyed titanium such as Grade 5 (Ti-6Al-4V) while retaining the core titanium advantages of low density and corrosion resistance.
Mechanical Properties
The following values are typical for Grade 2 titanium in the annealed condition, the most common supply state, per ASTM B265/B348:
| Property | Value |
|---|---|
| Tensile strength | 345–550 MPa (50,000–79,800 psi) |
| Yield strength (0.2% offset) | 275 MPa min (40,000 psi) |
| Elongation (50 mm) | 20% min |
| Reduction of area | 30% min |
| Hardness | Approx. 110–150 HB |
| Elastic modulus | About 103 GPa (15 x 10^6 psi) |
| Density | 4.51 g/cm3 |
The moderate strength is sufficient for structural components that are not extreme-load-bearing, while the high elongation and reduction of area confirm excellent ductility for forming and fabrication.
Chemical Composition and What It Controls
Grade 2 is commercially pure titanium: a titanium balance, typically 99.0% or higher, with tightly controlled interstitial elements. Oxygen, the primary interstitial element, is limited to 0.25% maximum (typical levels around 0.18–0.20%); it raises strength but slightly reduces ductility, and Grade 2 carries more oxygen than Grade 1, which is why it is stronger. Iron is limited to 0.30% max, carbon to 0.08% max to avoid brittle carbides, nitrogen to 0.03% max, and hydrogen to 0.015% max to prevent embrittlement. These controlled limits are what preserve the balance of strength, formability, corrosion resistance and biocompatibility that defines Grade 2.
Where Grade 2 Is Used
Grade 2 is specified for chemical processing equipment, heat exchangers, desalination plants, marine shafts and fittings, architectural cladding, food-processing equipment and medical implants. When an application demands significantly higher strength, Grade 5 (Ti-6Al-4V) is the standard alternative; when maximum formability is the priority and loads are low, Grade 1 may be chosen instead. Grade 2 sits in the middle as the default CP grade for the majority of industrial titanium applications.
FAQ
Is Grade 2 titanium stronger than Grade 1?
Yes. Grade 2 has a higher oxygen limit and therefore higher strength (tensile 345–550 MPa versus about 240–345 MPa for Grade 1), with only a small sacrifice in ductility.
Is Grade 2 titanium suitable for medical implants?
Yes. Its biocompatibility and corrosion resistance are proven in orthopedic screws and dental fixtures, though higher-strength applications may use Grade 5 or other implant alloys.
Can Grade 2 titanium be welded?
Yes. It welds well with appropriate shielding gas and cleanliness, and its good ductility also supports bending and cold forming.
Why is hydrogen limited in Grade 2 titanium?
Hydrogen can cause embrittlement, especially at elevated temperature or in thick sections, so it is held to 0.015% maximum.
Is Grade 2 titanium more expensive than stainless steel?
On a per-kilogram basis titanium is more expensive, but its lower density and corrosion resistance can make Grade 2 the lower total-cost choice for seawater and chemical service over the life of the equipment.
How can I verify the quality of Grade 2 titanium?
Request a mill test certificate against ASTM B265 or B348 showing the actual composition and mechanical values, and confirm the UNS R50400 designation on the documentation.
