Titanium Grade 7 is commercially pure titanium (similar to Grade 2) with the small addition of 0.12–0.25% palladium (Pd). This alloy offers outstanding corrosion resistance, especially in acidic and chloride-rich environments, due to the palladium-enhanced passivation. It is one of the most corrosion-resistant titanium grades and is widely used in the chemical processing, desalination, and pollution control industries.
Grade 7 has similar mechanical properties to Grade 2 but superior corrosion resistance in reducing acids like HCl and sulfuric acid.
Common Product Forms
Sheet & Plate
Seamless & Welded Tubes
Bars & Rods
Pipe & Pipe Fittings
Forgings (rings, flanges, blocks)
Welded assemblies and linings
Chemical Composition (per ASTM B265 / B348)
|
Element |
Content (%) |
|
Titanium (Ti) |
Balance |
|
Palladium (Pd) |
0.12 – 0.25 |
|
Oxygen (O) |
≤ 0.25 |
|
Iron (Fe) |
≤ 0.30 |
|
Carbon (C) |
≤ 0.08 |
|
Nitrogen (N) |
≤ 0.03 |
|
Hydrogen (H) |
≤ 0.015 |
|
Others (each) |
≤ 0.10 |
|
Others (total) |
≤ 0.40 |
Palladium addition activates corrosion protection under reducing conditions.
Mechanical Properties (Typical Values)
|
Property |
Value |
|
Tensile Strength |
≥ 450 MPa (65 ksi) |
|
Yield Strength (0.2% OS) |
≥ 275 MPa (40 ksi) |
|
Elongation |
≥ 20% |
|
Elastic Modulus |
~105 GPa |
|
Hardness (HB) |
~160 HB |
|
Density |
4.51 g/cm³ |
Thermal Properties
|
Property |
Value |
|
Melting Point |
~1,660 °C (3,020 °F) |
|
Thermal Conductivity |
~16.3 W/m·K |
|
Coefficient of Thermal Expansion |
~8.6 × 10⁻⁶ /°C |
|
Specific Heat Capacity |
~520 J/kg·K |
|
Max Operating Temp (Air) |
~425–500 °C |
Applications of Grade 7 Titanium
Chemical Processing Industry
Chlorine dioxide systems
Bleach plants (paper & pulp)
Heat exchangers handling reducing acids (HCl, H₂SO₄)
Reactors and tanks exposed to mixed acids
Water Treatment & Desalination
Evaporator tubing
Condenser tubing
Brine heaters
Seawater-cooled systems
Pollution Control / Flue Gas Treatment
Scrubber systems
Wastewater neutralization plants
Electrochemical & Anodizing Systems
Titanium anode baskets
Components in electroplating lines
Applicable Standards
ASTM B265 – Sheet and Plate
ASTM B348 – Rod and Bar
ASTM B338 / B861 – Tubes and Pipes
ASTM B381 – Forgings
ASTM B367 – Castings
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