6-4 ELI

6Al-4V ELI Titanium Sheet

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Product Description

Ti 6Al-4V ELI is the extra-low interstitial version of Ti 6Al-4V and its content is arrived at by the careful selection of ingot raw materials. It has been the material of choice for many medical and dental applications due to its excellent biocompatibility. The ELI grade has superior damage tolerance (fracture toughness, fatigue crack growth rate) and better mechanical properties at cryogenic temperatures compared to standard grade Ti 6Al-4V. It is also known as ASTM B348 Grade 23.

Ti 6Al-4V and Ti 6Al-4V ELI are the most widely used titanium alloys and account for more than half of all the titanium sponge used worldwide.  Aerospace applications account for 80% of that usage.  The remainder is found in defense, marine, medical, chemical, and other industries.

Neither grade of Ti 6Al-4V has corrosion properties quite as good as CP titanium, but both are corrosion resistant in seawater, oxidizing acids, aqueous chlorides, wet chlorine gas, and sodium hypochlorite.

Altering the interstitial levels tends to enhance certain properties;  Ti 6Al-4V ELI (Extra Low Interstitials) is a popular alloy where medium strength and good toughness are required.  The strength and ductility are similar, but the fracture toughness of the ELI grade is about 25% higher than the standard grade.  The ELI grade is usually specified for seawater applications (MIL-T-9047) and for medical use (ASTM F136).  A medical grade of Ti 6Al-4V (ASTM F1472) also exists.

Standard: AMS 4907K, AMS-T-9046A, ASTM B265,  ASTM F136, BS7252 PART 3, ISO 5832-3, MIL-T-9046, VMI 616-23, AMS 4905, AMS 4907, ASTM F1472.

Principal Uses Liquid hydrogen tankage – Principal Uses: Surgical appliances & implants, orthopedic implants, etc.
Available Forms Sheet, strip, plate, bar, billet, wire, extrusions, and tubing
Nominal Composition 0.08% max C, 0.05% max N, 0.015% max H (sheet) ➀ 0.013% max O, 5.5-6.5% AL, 3.5-4.5% V, 0.25% max Fe
Type Structure Alpha-Beta
Mechanical Properties Guaranteed RT Minimum Typical Properties at
-320F -423F
Ultimate Tensile Strength, psi 130,000 218,000 263,000
Yield Strength, 0.2% offset, psi 120,000 202,000 248,000
El in 2″ (> 0.025″ thick), pct 10 ➁ 13.5 6
Reduction of Area, percent
Bend Radius 4.5T ➂ %t ➃
Impact, Charpy V, ft-lb, Room Temperature 19
Welded Bend Radius 6-10 T
Hardness Rc 30/34
Rupture, Stress to Produce in ( ) hr, psi
Creep Data, Stress to Produce ( ) percent elongation in ( ) hr, psi
Physical Properties
Modulus of Elasticity, psi (106) tension 16.5
Modulus of Elasticity, psi (106) torsion Approx. 6.10
Density, lb / cu inch 0.160
Melting Range, deg F Approx. 3000F
Specific Electrical Resistivity micro ohms/cm/sq cm 171 at room temperature
Specific Heat, Btu/lb/deg F 0.135 at room temperature
Thermal Conductivity, Btu/hr.ft2-deg F/ft
Mean Coefficient of Thermal Expansion per deg F. (10-6) 32 – 212F 5.3
32 – 600F 5.3
32 – 1000F 5.3
32 – 1200F 5.5
32 – 1500F 5.7
Oxidation Characteristics in Air  
Short Time
Long Time
Remarks on Fabrication
Beta Transus 1820±25F
Cutting Readily cut with saw or abrasive wheel
Machinging Rigid set-up, slow speed, heavy feed, sharp tools, adequate coolant
Forming Formable; warm forming useful with solution treated material
Joining, Welding Sound ductile welds if protected
Remarks on Heat Treatment
Initial Forging 1800F – 1820F, no higher than 1750F to finish
Sheet – Strip – Plate Annealing – Bars and Forgings 1300 – 1600F, 15 – 60 min, air cool slower 1300 – 1450F, 1 – 2 hours, air cool or slower
Solution Treating Not Applicable
Aging Not Applicable
Stress Relief Annealing 900 – 1200F, 1 – 4 hr, AC
Notes and General Remarks ➀ 0.0125% max H (bar), 0.0100% max H (billet) ➁ 0.020 and below 8%; 10% for plate; determined by configuration of bar and forgings ➂ < 0.070 inch ➃ > 0.070 inch