Titanium Grade 12 is a corrosion-resistant titanium alloy containing controlled additions of nickel and molybdenum.
It provides higher strength than Grade 2 while offering enhanced corrosion resistance in a number of difficult chemical-process environments.
Grade 12 is designated UNS R53400 and is commonly referred to as a Ti-Ni-Mo titanium alloy.
Grade 12 Chemical Composition
| Element | Weight % |
|---|---|
| Titanium (Ti) | Balance |
| Nickel (Ni) | 0.6–0.9 |
| Molybdenum (Mo) | 0.2–0.4 |
| Iron (Fe) | ≤ 0.30 |
| Oxygen (O) | ≤ 0.25 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
Grade 12 Mechanical Properties
Representative minimum annealed properties include:
| Property | Value |
|---|---|
| Ultimate tensile strength | ≥ 483 MPa |
| 0.2% yield strength | ≥ 345 MPa |
| Elongation | ≥ 18% |
| Density | approximately 4.51 g/cm³ |
Corrosion Resistance
Nickel and molybdenum improve Grade 12’s corrosion performance compared with conventional commercially pure titanium in a number of reducing and crevice-corrosion conditions.
It is often considered where both higher strength and improved corrosion resistance are required from a readily weldable titanium alloy.
The suitability of Grade 12 for a specific chemical environment should always be determined from process-specific corrosion data.
Fabrication
Grade 12 can be welded using normal titanium welding procedures with effective inert-gas shielding.
Its formability is lower than that of the softer commercially pure grades but remains suitable for many fabricated process-equipment components.
Typical Applications
- Chemical-process equipment
- Heat exchangers
- Pressure vessels
- Piping
- High-temperature brine systems
- Hydrometallurgical equipment
- Marine equipment
- Equipment exposed to crevice-corrosion conditions
Common Specifications
- ASTM B265
- ASME SB-265
- Corresponding ASTM/ASME specifications for other product forms, as applicable
Technical Note
Chemical and mechanical properties shown are representative of commonly referenced specifications. Requirements can vary by product form, thickness, heat treatment and governing standard. Material should be ordered to the required specification, and the supplied material test report (MTR) should be used to verify compliance.
