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Titanium CP Grade 2 pipe
Titanium Grade 2 (CP Grade 2)
Industries and Applications:
Grade 2 titanium is highly valued for its lower density, making it an ideal choice for heavy-duty applications. Two major industries that rely heavily on titanium alloys are medical and aerospace. Grade 2 titanium's impressive strength and corrosion resistance also make it a top pick for marine, chemical processing, and desalination sectors. Common applications include oil and gas components, reaction vessels, pressure vessels, pipes and piping systems, heat exchangers, linings, flue gas desulfurization systems, and various other industrial parts. It can operate continuously at temperatures up to 800°F and occasionally at up to 1000°F.
Preservation and Corrosion Resistance:
The corrosion resistance of Grade 2 titanium stems from the formation of a strong, adherent, and stable oxide film in the presence of oxygen. This protective layer allows Grade 2 titanium to withstand most oxidizing, neutral, and mildly reducing environments. It exhibits excellent resistance to seawater and marine atmospheric corrosion. Although the corrosion resistance levels among the four commercial purity grades are similar, their mechanical properties vary based on differing oxygen and iron contents. Grade 2 titanium stands out for resisting attacks from moist chlorides, metallic chlorides, chlorite and hypochlorite solutions, nitric and chromic acids, organic acids, and numerous gaseous industrial applications.
Manufacturing and Heat Treatment:
Grade 2 titanium boasts good ductility, allowing it to be cold-formed effectively. To avoid issues during cold forming, thinner materials (less than 0.070 inches) should use a minimum bend radius of 2T, whereas thicker materials should use 2.5T. It's also straightforward to machine, heat treat, and weld. Hot working should occur within a temperature range of 400°F to 600°F. Stress relief can be achieved by heating to temperatures between 900°F and 1100°F, followed by forced ventilation or slow cooling. Annealing temperatures typically range from 1200°F to 1400°F for durations of 6 minutes to 2 hours, followed by air cooling.
Welding of Grade 2 titanium can be done using several methods, including MIG and TIG. Inert gas shielding is crucial to prevent the weld area from absorbing oxygen, which could lead to brittleness. A mix of argon and helium is commonly used, though testing should always be conducted prior to welding. Neither preheating nor post-heating is necessary.
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 (KSI) | Tensile Strength min (MPa) | Yield Strength min (KSI) | Yield Strength min (MPa) | Elongation (%) |
|------------------------|----------------------------|----------------------------|--------------------------|--------------------------|----------------|
| Titanium CP Grade 2 | 50 | 345 | 40-65 | 276-448 | 20 |
Availability:
Grade 2 titanium is available in a wide range of forms, including bar, billet, extrusion, plate, sheet, strip, wire, pipe, tube, rings, and forgings.
Forgings:
- Ring Size Capability: OD ≤ 1300mm, Height ≤ 250mm
- Disc Size Capability: OD ≤ 1100mm, Height ≤ 40mm
Most applications of this grade are found in the chemical industry, with common uses including reactor autoclaves, piping and fittings, valves, heat exchangers, and condensers.
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
This versatile alloy continues to play a crucial role in modern industries, thanks to its unique combination of strength, corrosion resistance, and ease of fabrication.