|Technique:||Seamless||Product Name:||Titanium Tube,Titanium Tubing|
|Shape:||Round Shape||Advantage:||High Performance|
Grade 23 Titanium Alloy Tube,
ASTM Titanium Alloy Tube
Ti-6-4, ASTM Grade 23 titanium, UNS R56401 (ELI), Ti-6Al-4V ELI, Ti64
Titanium alloys are divided into three main groups: alpha-phase, beta-phase, and alpha-beta-phase. Grade 23 Ti 6Al 4V ELI alloy is an alpha-beta wrought alloy. The ELI stands for extra-low interstitial. For an alloy to be branded as an ELI product, it should be produced as such at the mill. Excellent, especially when direct contact with tissue or bone is required. Ti-6Al-4V's poor shear strength makes it undesirable for bone screws or plates. It also has poor surface wear properties and tends to seize when in sliding contact with itself and other metals. Surface treatments such as nitriding and oxidizing can improve surface wear properties.
The following sections will discuss in detail about grade 23 Ti-6Al-4V ELI alloy.
The chemical composition of grade 23 Ti-6Al-4V ELI alloy is outlined in the following table.
|Titanium, Ti||88.09 - 91|
|Aluminum, Al||5.5 - 6.5|
|Vanadium, V||3.5 - 4.5|
|Iron, Fe||≤ 0.25|
|Carbon, C||≤ 0.080|
|Nitrogen, N||≤ 0.030|
|Hydrogen, H||≤ 0.0125|
|Other, each||≤ 0.10|
|Other, total||≤ 0.40|
The physical properties of grade 23 Ti-6Al-4V ELI alloy are tabulated below.
|Density||4.43 g/cm3||0.160 lb/in3|
|Melting point||1604 - 1660°C||2919 - 3020°F|
The following table shows the mechanical properties of grade 23 Ti-6Al-4V ELI alloy.
|Tensile strength||860 MPa||125000 psi|
|Yield strength||790 MPa||115000 psi|
|Elastic modulus||113.8 GPa||16510 ksi|
|Shear modulus||44.0 GPA||6380 ksi|
|Elongation at break||15%||15%|
|Hardness, Rockwell C||35||35|
The thermal properties of grade 23 Ti-6Al-4V ELI alloy are tabulated below.
|Thermal expansion coefficient (@20-100°C/68-212°F)||8.60 µm/m°C||4.78 µin/in°F|
|Thermal conductivity||6.70 W/mK||46.5 BTU in/hr.ft².°F|
Equivalent materials to grade 23 Ti-6Al-4V ELI alloy are as follows:
AMS 4907, AMS 4931, ASTM F136, ASTM F467 (TI-5), ASTM F468 (5), ASTM F468 (S), MIL F-83142
MIL T-9046, MIL T-9047, SPS M618, AMS 4930, AMS 4956
Grade 23 Ti-6Al-4V ELI 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.
Grade 23 Ti-6Al-4V ELI alloy can be hot or cold formed. Forming techniques include hydro press, stretch or drop-hammer.
Weldability of Grade 23 Ti-6Al-4V ELI alloy is rated as fair.
The material can be solution treated at 904-954 °C (1660-1750°F) for 2 h, and then water quenched.
For annealing Grade 23 Ti-6Al-4V ELI alloy, the material has to be held at 732°C (1350°F) for about 1/4 and 4h. It should then be furnace cooled to 566°C (1050°F) then air-cooled.
Rough forging can be performed at 982°C (1800°F), and completed at 968°C (1750°F).
Hot-working enhances the overall ductility of the material.
Cold working features of this material is the same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.
Aging of Grade 23 Ti-6Al-4V ELI alloy can be performed at 538°C (1000°F) for 4 h and air-cooled.
Grade 23 Ti-6Al-4V ELI alloy is used in the following areas:
In a variety of saltwater applications
In high-pressure cryogenic vessels down to -320°C
In applications requiring excellent fracture toughness and fatigue strength.
Sheet, Strip, Foil, and Tubing
ASTM B265 Gr.23 - Sheet, plate
ASTM B338 Gr.23 - Heat exchange tube
ASTM B861 Gr.23 - Titanium and Titanium Alloy Seamless Pipe
ASTM B862 Gr.23 - Titanium and Titanium Alloy Welded Pipe
ASTM B348 Gr.23 - Bar
ASTM B381 Gr.F23 - Forgings
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