Titanium Grade 12 · UNS R53400 · W. Nr. 3.7105 · Ti-0.3Mo-0.8Ni · TA10
Titanium Grade 12 (Ti-0.3Mo-0.8Ni) (R53400): composition, properties, fittings and flanges
Titanium Grade 12 (UNS R53400, W. Nr. 3.7105, Chinese TA10) contains 0.2-0.4 % molybdenum and 0.6-0.9 % nickel, which raise creep strength and improve resistance to crevice corrosion in hot chloride and mildly reducing environments. Minimum annealed properties are higher than Grade 2: 483 MPa (70 ksi) tensile strength, 345 MPa…
- UNS
- R53400
- W. Nr.
- 3.7105
- Density
- 4.51 g/cm³ (0.163 lb/in³)
- Key strength
- 483 MPa / 70 ksi
Identification and standards
| Short form | Titanium Grade 12 · UNS R53400 · W. Nr. 3.7105 · Ti-0.3Mo-0.8Ni · TA10 |
|---|---|
| Classification | Molybdenum-nickel enhanced corrosion resistant titanium |
| UNS | R53400 |
| Werkstoff number | 3.7105 |
| Material family | Titanium Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Titanium (Ti) | Balance | Matrix |
| Nickel (Ni) | 0.60 - 0.90 | Improves reducing acid crevice resistance |
| Molybdenum (Mo) | 0.20 - 0.40 | Solid-solution strengthening, crevice resistance |
| Oxygen (O) | 0.25 max | - |
| Iron (Fe) | 0.30 max | - |
| Carbon (C) | 0.08 max | - |
| Nitrogen (N) | 0.03 max | - |
| Hydrogen (H) | 0.015 max | Restricted to avoid hydride embrittlement |
| Other elements, each / total | 0.10 max / 0.40 max | - |
Note Single figures are maximum limits unless shown as a range. Always confirm against the heat-specific EN 10204 3.1 certificate supplied with your order.
Mechanical properties
| Tensile strength, min (annealed) | 483 MPa / 70 ksi |
|---|---|
| 0.2 % yield strength, min | 345 MPa / 50 ksi |
| Elongation in 2 in, min | 18 % |
| Typical hardness, annealed | 180 - 220 HB |
| Modulus of elasticity | 103 GPa (15 x 10⁶ psi) |
| Typical creep advantage over Grade 2 | Improved strength at 300-400 °C |
Warning Values depend on product form, section thickness and heat treatment. Larger sections generally achieve lower strength than thin product; always design against the applicable code allowable stress rather than these figures.
Physical properties
| Density | 4.51 g/cm³ (0.163 lb/in³) |
|---|---|
| Melting point | Approximately 1650 °C (3000 °F) |
| Thermal conductivity at 20 °C | 19.0 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 9.3 µm/m·°C |
| Electrical resistivity at 20 °C | 0.52 µΩ·m |
| Magnetic behaviour | Non-magnetic |
Specifications by product form
| Bar / rod / billet | ASTM B348 / ASME SB-348 |
|---|---|
| Plate / sheet / strip | ASTM B265 / ASME SB-265 |
| Seamless pipe & tube | ASTM B338 / ASME SB-338, ASTM B861 |
| Welded pipe & tube | ASTM B862 |
| Forgings & flanges | ASTM B381 / ASME SB-381 (Grade F12) |
| Butt weld fittings | ASTM B363 / ASME SB-363 (WPT12) |
| Welding consumables | ERTi-12 filler wire |
| UNS / EN / China | UNS R53400 · EN Ti-0.3Mo-0.8Ni / W. Nr. 3.7105 · GB TA10 |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Seamless and welded pipe and tube
- Forged flanges to ASME B16.5
- Elbows, tees and reducers to ASME B16.9
- Shell and tube heat exchanger bundles
Typical applications
- Chemical processing vessels and piping in hot chloride service
- Geothermal brine piping, heat exchangers and separators
- Desalination plant heat rejection sections and brine recirculation piping
- Offshore topside seawater systems with higher design pressures
- Flue gas scrubber internals and mist eliminators
- Hydrometallurgy autoclaves operating with acidic chloride slurries
Welding, forming and machining
- Welding
- Weld using ERTi-12 filler with full argon shielding and trailing shields; the alloy is readily weldable and retains corrosion resistance in the weld.
- Forming
- Cold formability approaches that of Grade 2, allowing standard shop fabrication of heads and shells.
- Machining
- Standard titanium practice: rigid setups, sharp tools, low speed and generous coolant.
- Selection
- Choose Grade 12 when Grade 2 crevice corrosion or design stress is marginal but the palladium premium of Grade 7 cannot be justified.
Buy Titanium Grade 12 (Ti-0.3Mo-0.8Ni) from Hangbo
Material is supplied with full heat-number traceability, solution annealing or ageing performed under calibrated furnace control, and an EN 10204 3.1 certificate covering chemical analysis, mechanical properties, heat treatment records and the agreed NDT scope. Positive material identification and third party inspection and test reports from SGS are available for critical service.