Titanium CP Grade 2
Industries and Applications
Grade 2 titanium is known for its lower density, making it well-suited for heavy-duty applications. It is widely used in the medical and aerospace industries due to its excellent strength-to-weight ratio and biocompatibility. Beyond these sectors, it also finds extensive use in marine, chemical processing, and desalination environments thanks to its outstanding corrosion resistance and durability. Common applications include oil and gas components, pressure vessels, piping systems, heat exchangers, linings, flue gas desulfurization systems, and various industrial parts. This grade can operate continuously at temperatures up to 800°F and intermittently up to 1000°F.
Corrosion Resistance
The corrosion resistance of commercially pure (C.P.) titanium grades stems from the formation of a stable, adherent oxide layer when exposed to oxygen. This protective film allows Grade 2 titanium to perform well in oxidizing, neutral, and mildly reducing environments. It shows exceptional resistance to seawater and marine atmospheric conditions. While all C.P. titanium grades have similar corrosion resistance, their mechanical properties vary depending on the levels of oxygen and iron content. Grade 2 is particularly resistant to moist chlorides, metallic chlorides, chlorite, hypochlorite solutions, nitric and chromic acids, organic acids, and various gaseous industrial environments.
Manufacturing and Heat Treatment
Grade 2 titanium is highly ductile and suitable for cold forming. For materials less than 0.070 inches thick, a minimum bend radius of 2T is recommended, while thicker materials should use a 2.5T radius to avoid cracking or deformation. The material is also easy to machine, weld, and heat treat. Hot working is typically performed between 400°F and 600°F. Stress relief can be achieved by heating to 900°F–1100°F, followed by either forced air cooling or slow cooling. Annealing is done at temperatures ranging from 1200°F to 1400°F for 6 minutes to 2 hours, then cooled in air.
Welding of Grade 2 titanium can be carried out using methods like MIG and TIG welding. It's crucial to use inert gas shielding, such as a mix of argon and helium, to prevent oxidation and embrittlement in the weld area. Preheating and post-weld heat treatment are generally not required.
Chemical Composition
| Weight % |
Ti |
C |
Fe |
N |
O |
H |
| Titanium CP Grade 2 |
Bal. |
0.08 |
0.30 |
0.05 |
0.020 |
0.015 |
Mechanical Properties
| Material |
Tensile Strength min |
Yield Strength min |
Elongation |
| KSI |
MPa |
KSI |
MPa |
A (%) |
| Titanium CP Grade 2 |
50 |
345 |
40-65 |
276-448 |
20 |
Availability
Titanium Grade 2 is available in a wide range of forms, including bar, billet, extrusion, plate, sheet, strip, wire, pipe, tube, rings, and forgings. Its versatility makes it suitable for a variety of industrial needs.
Forgings:
Ring size capability: OD ≤ 1300mm, Height ≤ 250mm
Disc size capability: OD ≤ 1100mm, Height ≤ 40mm
Grade 2 titanium is commonly used in the chemical industry for reactor autoclaves, piping, valves, heat exchangers, and condensers. It is also frequently specified in ASTM standards such as ASTM B265 Gr2 (Sheet, Plate), ASTM B338 Gr2 (Heat Exchange Tube), ASTM B348 Gr2 (Bar), ASTM B381 Gr2 (Forgings), ASTM F467 Gr2 (Nuts), and ASTM F468 Gr2 (Bolts).
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