Titanium Grade 2 · UNS R50400 · W. Nr. 3.7035 · CP Ti · TA2
Titanium Grade 2 (R50400): composition, properties, fittings and flanges
Titanium Grade 2 (UNS R50400, W. Nr. 3.7035, Chinese TA2) is the workhorse commercially pure titanium grade, containing at least 99.2 % titanium with controlled oxygen, iron, carbon, nitrogen and hydrogen. Minimum annealed properties are 345 MPa (50 ksi) tensile strength, 275 MPa (40 ksi) yield strength and 20 % elongation. Its…
- UNS
- R50400
- W. Nr.
- 3.7035
- Density
- 4.51 g/cm³ (0.163 lb/in³)
- Key strength
- 345 MPa / 50 ksi
Identification and standards
| Short form | Titanium Grade 2 · UNS R50400 · W. Nr. 3.7035 · CP Ti · TA2 |
|---|---|
| Classification | Commercially pure titanium (unalloyed, standard oxygen) |
| UNS | R50400 |
| Werkstoff number | 3.7035 |
| Material family | Titanium Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Titanium (Ti) | Balance | Matrix |
| Oxygen (O) | 0.25 max | Principal interstitial strengthener |
| Iron (Fe) | 0.30 max | - |
| Carbon (C) | 0.08 max | - |
| Nitrogen (N) | 0.03 max | - |
| Hydrogen (H) | 0.015 max | Restricted to prevent hydride embrittlement |
| Other elements, each | 0.10 max | - |
| Other elements, total | 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) | 345 MPa / 50 ksi |
|---|---|
| 0.2 % yield strength, min | 275 MPa / 40 ksi |
| Elongation in 2 in, min | 20 % |
| Reduction of area, typical | 30 % |
| Typical hardness, annealed | 120 - 200 HB |
| Beta transus temperature | Approximately 913 °C |
| Maximum recommended continuous service in air | 425 °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 1660 °C (3020 °F) |
| Modulus of elasticity | 105 GPa (15.2 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 16.4 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 8.6 µm/m·°C |
| Electrical resistivity at 20 °C | 0.42 µΩ·m |
| Magnetic behaviour | Non-magnetic |
Specifications by product form
| Bar / rod / billet | ASTM B348 / ASME SB-348, AMS 4921 |
|---|---|
| Plate / sheet / strip | ASTM B265 / ASME SB-265, AMS 4902 |
| Seamless pipe & tube | ASTM B338 / ASME SB-338, ASTM B861 pipe |
| Welded pipe & tube | ASTM B862 / B338 to ASTM B338 dimensional limits |
| Forgings & flanges | ASTM B381 / ASME SB-381 |
| Butt weld fittings | ASTM B363 / ASME SB-363 (WPT2) |
| Welding consumables | ERTi-2 filler wire (AWS A5.16) |
| UNS / EN / China | UNS R50400 · EN Ti 2 / W. Nr. 3.7035 · GB TA2 |
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 including condenser tube
- Forged flanges to ASME B16.5 Class 150-600 (ASTM B381 F2)
- Butt weld elbows, tees, reducers and stub ends to ASME B16.9 (ASTM B363 WPT2)
- Heat exchanger bundles, tube sheets and reactors
Typical applications
- Shell and tube heat exchangers, condensers and surface condensers in power stations
- Desalination and brine heater tubing, evaporators and piping
- Seawater cooling, ballast and firewater piping on ships and platforms
- Chlor-alkali, chlorine dioxide bleaching and hypochlorite handling equipment
- Nitric acid and oxidising acid process equipment
- Hydrometallurgical autoclaves, leaching vessels and reactor linings
- Flue gas desulphurisation absorber towers and outlet ducting
Welding, forming and machining
- Welding
- Weld by GTAW with ERTi-2 filler under strict inert shielding - argon trailing shields and backing gas are mandatory to prevent oxygen and nitrogen pick-up. A silvery weld bead indicates proper shielding; straw or blue colours mean the weld is contaminated.
- Forming
- Cold formability is excellent, comparable to a deep drawing quality stainless steel. Hot form between 540 °C and 760 °C for heavy sections.
- Machining
- Low thermal conductivity concentrates heat at the cutting edge. Use sharp tools, low cutting speeds, high feed rates and flood coolant; avoid tool dwell and chlorine-based cutting fluids.
- Service limits
- Do not use in dry chlorine without water present, anhydrous methanol, red fuming nitric acid or strongly reducing acids, where the passive film cannot reform.
Buy Titanium Grade 2 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.