Titanium Grade 12 is an alpha titanium alloy that contains small additions of molybdenum (Mo ~0.3%) and nickel (Ni ~0.8%). These alloying elements enhance its corrosion resistance, particularly against reducing acids, brines, and chlorides, while also improving weldability and strength over CP titanium (Grades 1-4).
Grade 12 is often referred to as the "corrosion-resistant workhorse" for heat exchangers, chemical plants, and power generation systems.
Common Product Forms
Seamless & Welded Tubes (ASTM B338)
Plates & Sheets (ASTM B265)
Bars & Rods (ASTM B348)
Pipes & Fittings (ASTM B861/B862)
Forgings & Flanges (ASTM B381)
Welded components for corrosive service
Chemical Composition (ASTM B265 / B338 / B348)
|
Element |
Content (%) |
|
Titanium (Ti) |
Balance |
|
Molybdenum (Mo) |
0.2 – 0.4 |
|
Nickel (Ni) |
0.6 – 0.9 |
|
Iron (Fe) |
≤ 0.30 |
|
Oxygen (O) |
≤ 0.25 |
|
Carbon (C) |
≤ 0.08 |
|
Nitrogen (N) |
≤ 0.03 |
|
Hydrogen (H) |
≤ 0.015 |
|
Others (each) |
≤ 0.10 |
|
Others (total) |
≤ 0.40 |
Mechanical Properties (Typical, Annealed Condition)
|
Property |
Value |
|
Tensile Strength |
≥ 483 MPa (70 ksi) |
|
Yield Strength (0.2% OS) |
≥ 345 MPa (50 ksi) |
|
Elongation |
≥ 18% |
|
Elastic Modulus |
~105 GPa |
|
Hardness (HB) |
~160–200 HB |
|
Density |
4.54 g/cm³ |
Thermal Properties
|
Property |
Value |
|
Melting Point |
~1,630 °C (2,970 °F) |
|
Thermal Conductivity |
~16.4 W/m·K |
|
Coefficient of Thermal Expansion |
~8.6 × 10⁻⁶ /°C |
|
Specific Heat Capacity |
~523 J/kg·K |
|
Max Operating Temperature |
~500–600 °C |
Applications of Grade 12 Titanium
Chemical & Petrochemical Industry
Heat exchangers (shell & tube)
Reactors, tanks, and process piping
Condensers handling chlorides or reducing acids
Power Generation
Steam condensers
Pollution control equipment
Brine heater tubing
Desalination & Water Treatment
Seawater-cooled systems
Evaporators and distillers
Piping and tubing for RO plants
Industrial Manufacturing
Bleaching equipment in pulp & paper
Electrochemical systems
Acid recovery units
Applicable Standards
ASTM B265-Titanium Sheet and Plate
ASTM B338-Seamless Titanium Tube for Heat Exchangers
ASTM B348-Bars and Rods
ASTM B861 / B862-Welded and Seamless Titanium Pipe
ASME SB equivalents-For pressure vessels
Key Advantages of Grade 12 Titanium
Superior corrosion resistance in reducing and oxidizing conditions (incl. HCl, wet chlorine gas)
Excellent weldability with minimal embrittlement
High strength compared to CP grades
Ideal for seawater, brine, and acidic chloride environments
Long service life in harsh industrial conditions
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