Titanium CP Grade 2
Industries and Applications
Grade 2 titanium is known for its low density and high strength, making it suitable for a wide range of heavy-duty applications. It is widely used in the medical and aerospace industries due to its biocompatibility and excellent mechanical properties. In addition, its resistance to corrosion makes it ideal for use in marine environments, chemical processing, and desalination plants. 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, including Grade 2, is due to the formation of a stable and adherent oxide layer when exposed to oxygen. This protective film allows the material to withstand most oxidizing, neutral, and mildly reducing environments. Grade 2 exhibits particularly good resistance to seawater and marine atmospheric corrosion. While the corrosion resistance among the four C.P. grades is similar, their mechanical properties differ based on variations in oxygen and iron content. Grade 2 is also resistant to moist chlorides, metallic chlorides, chlorite, hypochlorite solutions, nitric and chromic acids, organic acids, and many gaseous industrial environments.
Manufacturing and Heat Treatment
Grade 2 titanium has good ductility, making it easy to cold-form. For materials less than 0.070 inches thick, a minimum bend radius of 2T is recommended, while for thicker materials, a radius of 2.5T should be used. The material is also easily machined, heat-treated, and welded. Hot working is typically done between 400°F and 600°F. Stress relief can be achieved by heating to 900°F–1100°F followed by forced air cooling or slow cooling. Annealing is performed 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 such as MIG and TIG welding. It is essential to use inert gas shielding, like a mixture of argon and helium, to prevent oxidation and embrittlement in the weld area. Preheating or post-weld heat treatment is 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 |
KSI |
MPa |
A (%) |
| Titanium CP Grade 2 |
50 |
345 |
40-65 |
276-448 |
20 |
Availability
Titanium Grade 2 is available in multiple forms, including bar, billet, extrusion, plate, sheet, strip, wire, pipe, tube, rings, and forgings. This versatility makes it suitable for a broad range of manufacturing 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 applications such as reactor autoclaves, piping and fittings, valves, heat exchangers, and condensers. Its reliability and performance make it a preferred choice in demanding environments.
Standards:
ASTM B265 Gr2 - Sheet, plate
ASTM B338 Gr2 - Heat exchange tube
ASTM B348 Gr2 - Bar
ASTM B381 Gr2 - Forgings
ASTM F467 Gr2 - Nuts
ASTM F468 Gr2 - Bolts
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