Titanium Grade 5 · UNS R56400 · W. Nr. 3.7165 · TC4 · Ti-6Al-4V · AMS 4928
Titanium Grade 5 (Ti-6Al-4V) (R56400): composition, properties, fittings and flanges
Titanium Grade 5, widely known as Ti-6Al-4V or TC4 (UNS R56400, W. Nr. 3.7165), accounts for roughly half of all titanium produced. It is an alpha-beta alloy containing 5.5-6.75 % aluminium and 3.5-4.5 % vanadium. In the annealed condition it delivers a minimum tensile strength of 895 MPa (130 ksi) and yield strength of 828 MPa…
- UNS
- R56400
- W. Nr.
- 3.7165
- Density
- 4.43 g/cm³ (0.160 lb/in³)
- Key strength
- 895 MPa / 130 ksi
Identification and standards
| Short form | Titanium Grade 5 · UNS R56400 · W. Nr. 3.7165 · TC4 · Ti-6Al-4V · AMS 4928 |
|---|---|
| Classification | Alpha-beta titanium alloy (Ti-6Al-4V) |
| UNS | R56400 |
| Werkstoff number | 3.7165 |
| Material family | Titanium Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Titanium (Ti) | Balance | Matrix |
| Aluminium (Al) | 5.50 - 6.75 | Alpha stabiliser - strength and oxidation resistance |
| Vanadium (V) | 3.50 - 4.50 | Beta stabiliser - heat treat response and ductility |
| Iron (Fe) | 0.40 max | - |
| Oxygen (O) | 0.20 max | - |
| Carbon (C) | 0.08 max | - |
| Nitrogen (N) | 0.05 max | - |
| Hydrogen (H) | 0.015 max | Restricted to prevent 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 bar, AMS 4928) | 895 MPa / 130 ksi |
|---|---|
| 0.2 % yield strength, min | 828 MPa / 120 ksi |
| Elongation in 2 in, min | 10 % |
| Reduction of area, typical | 25 - 30 % |
| Typical hardness, annealed | 300 - 340 HB (approximately 32 - 36 HRC) |
| Typical tensile after solution treat and age | Above 1100 MPa / 160 ksi |
| Beta transus temperature | Approximately 995 °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 | 4.43 g/cm³ (0.160 lb/in³) |
|---|---|
| Melting range | 1604 - 1660 °C (2920 - 3020 °F) |
| Modulus of elasticity | 114 GPa (16.5 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 6.7 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 8.6 µm/m·°C |
| Electrical resistivity at 20 °C | 1.78 µΩ·m |
| Maximum recommended continuous service | About 400 °C |
Specifications by product form
| Bar / rod / billet | ASTM B348 / ASME SB-348, AMS 4928, AMS 6931, AMS 4967 |
|---|---|
| Plate / sheet / strip | ASTM B265 / ASME SB-265, AMS 4911 |
| Seamless pipe & tube | ASTM B338 / ASME SB-338, ASTM B861 |
| Forgings & flanges | ASTM B381 / ASME SB-381, AMS 4928 forgings |
| Butt weld fittings | ASTM B363 / ASME SB-363 (WPT5) |
| Surgical implants | ASTM F136, ISO 5832-3, ASTM F1472 |
| Welding consumables | ERTi-5 filler wire (AWS A5.16) |
| UNS / EN / China | UNS R56400 · EN Ti-6Al-4V / W. Nr. 3.7165 · GB TC4 |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Seamless pipe and tube including drill pipe and downhole tubulars
- Forged discs, rings, blocks and flanges to drawing
- Machined components produced on 4 and 5 axis machining centres
- Fasteners, springs and suspension hardware
Typical applications
- Aerospace airframe structures, wing skins, bulkheads, landing gear and engine pylons
- Aero-engine compressor discs, blades, casings and fan hubs
- Offshore and subsea risers, stress joints, manifolds and ROV components
- Downhole tubulars, drill pipe and completion equipment for deep sour wells
- Motorsport suspension, connecting rods, valves, springs and fasteners
- Medical implants including hip stems, spinal hardware and trauma plates
- Marine hardware such as propeller shafts, sailboat fittings and yacht rigging
Welding, forming and machining
- Heat treatment
- Mill anneal at 705-790 °C then air cool. Solution treating at around 955 °C followed by water quench and ageing at 540 °C for 4-8 hours raises strength substantially; do not exceed the beta transus during solution treatment unless a transformed beta structure is specified.
- Welding
- Weldable by GTAW, plasma, electron beam and laser methods with ERTi-5 filler under strict argon shielding. Welded joints should be stress relieved at 540-650 °C where dimensional stability and residual stress control matter.
- Machining
- The combination of low thermal conductivity and high strength at temperature demands rigid setups, sharp carbide tools, low cutting speeds, high feed and copious coolant; never let the tool rub or dwell.
- Forming
- Cold forming is limited by lower room-temperature ductility compared with Grade 2; hot forming and creep forming at 700-900 °C are standard for aerospace parts.
Buy Titanium Grade 5 (Ti-6Al-4V) 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.
Titanium Grade 5 (Ti-6Al-4V) frequently asked questions
What is the difference between Titanium Grade 5 and Grade 2?
Grade 5 is a heat treatable alpha-beta alloy with roughly double the strength but lower formability and weldability, and higher cost. Grade 2 is commercially pure, easier to form and weld, and is preferred for process equipment; Grade 5 is used where strength to weight governs the design.
Is Titanium Grade 5 magnetic?
No. Titanium and its alloys are non-magnetic in all heat treated conditions, which is why they are used around MRI equipment and for downhole instrumentation housings.
Can Grade 5 be used in seawater?
Yes, it has the same outstanding seawater and chloride corrosion resistance as Grade 2. It is used for high pressure seawater pumps, subsea manifolds and riser components where higher strength is required.
What is the maximum service temperature for Grade 5?
About 400 °C for continuous service. Above that, creep resistance and oxidation become limiting, and dedicated high-temperature titanium alloys such as Ti-6242 are used instead.
Is Ti-6Al-4V biocompatible?
Yes. Extra low interstitial variants meet ASTM F136 and ISO 5832-3 for surgical implants, and Hangbo supplies implant grade material with full certification on request.