Titanium Grade 12

Titanium Alloy Grade 12 has outstanding corrosion resistance and a combination of high strength and low density, with good ductility. Small additions of nickel and molybdenum have been made to this alloy resulting increase in corrosion resistance and high strength. It is particularly suitable for use in mildly reducing conditions, or where conditions vary from oxidising to reducing. It is particularly resistant to crevice corrosion in hot brines. If you need titanium supplied for your next project, please do not hesitate to contact us.

 Chemical Composition Titanium Grade 12

ASTM Product Specifications

Many of the applications of grade 12 titanium alloy are in the chemical industries. The common uses are in chemical processing, where titanium alloy grade 12 is used for reactor autoclaves, piping and fittings, valves, heat exchanges and condensers.

Applications of Titanium Grade 12

Grade 12 Ti 0.3 Mo 0.8 Ni alloy is used in the following application areas:

• Pumps
• Valves
• Heat exchangers
• Pipes and fittings
• Chemical processing
• In high-temperature chemical manufacturing equipment
• Marine and airframe components
• In medium-reducing or variable oxidizing-reducing media - containers

Physical Properties

 Titanium Grade 12  Corrosion Resistance

Titanium alloys are usually used in Australia for their excellent corrosion resistance, especially to chloride solutions. The small additions of nickel and molybdenum to grade 12 titanium give a more corrosion-resistant metal than the commercial purity grade 2 alloy, with a marked increase in strength. The overall corrosion resistance of this grade is not as good as the palladium alloyed lean grade 7, except for resistance to crevice corrosion in hot chloride solutions. Titanium has excellent resistance to general corrosion, with loss rates of less than 0.04mm/year being typical.

Hot Working

Hot working enhances the overall ductility of the material.

Cold Working

The cold working features of this material is the same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favourable performance properties.

Titanium Grade 12 Machining

Grade 12 Ti 0.3 Mo 0.8 Ni alloy can be machined using slow speeds, the right quantity of coolant flow and high feed rates. High-speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt-based.

Forming

Grade 12 Ti 0.3 Mo 0.8 Ni alloy can be hot or cold-formed.

Annealing

For annealing grade 12 Ti 0.3 Mo 0.8 Ni alloy, the material has to be heated to 732-816°C (1350-1500°F), held for 2 h followed by air cooling. In case of intermediate stress relieving, the material has to be heated to 538-649°C (1000-1200°F) and held for 1 h followed by air cooling.

 Forging

Rough forging can be performed at 871°C (1600°F) and completed at 788-843°C (1450-1550°F)

Weldability

The weldability of grade 12 Ti 0.3 Mo 0.8 Ni alloy is rated as excellent.

Other Designations

Equivalent materials to grade 12 Ti 0.3 Mo 0.8 Ni alloy are as follows:

• ASTM B265 (12)
• ASTM B337 (12)
• ASTM B338 (12)
• ASTM B348 (12)
• ASTM B381 (F-12)

Conclusion

Titanium Grade 12 0.8NI-0.3MO is a commercially pure wrought Titanium alloy. Grade 12 demonstrates excellent strength at high temperatures, excellent weldability, and crevice corrosion resistance. This material is similar to Titanium Grade 2 and Grade 3 with the addition of molybdenum and nickel, which offers enhanced corrosion resistance. Grade 12 can be hot or cold formed using press brake forming, hydro press forming, stretch forming or drop hammer method. The ability of This material to be formed in various ways makes Grade 12 useful in numerous applications.