Ti-6AL-4V ELI Titanium Alloy

 

ti 6-4 eli image
TI 6-4 ELI Billet

Ti-6Al-4V ELI Titanium alloy (also known as Ti 6-4 ELI and Grade 23) is the extra low interstitial variant of Ti 6AL-4V, allowing it for common use in the biomedical space. The combination of low weight, durability, and corrosion resistance make 6Al-4V ELI the perfect metal for medical devices and implants.  Ti 6Al-4V ELI is mainly titanium based, with aluminum and vanadium being the other major chemical properties. Standard specifications for Grade 23 include AMS 4907, AMS 4930, Mil-T 9047 and more.

 

At Rickard Specialty Metals, we have 25+ years of experience supplying Ti 6-4 ELI forgings and many other product forms to your custom measurements and shapes. Our forging process includes open die forgings, ring rolling and more. See below for a list of the common Ti 6Al-4V ELI  forged shapes and product forms we offer.

NOMINAL COMPOSITION

  • Al    5.5 – 6.5
  • V     3.5 – 4.5
  • Fe    .25 max
  • O     .13 max
  • C     .08 max
  • N     .03 max
  • H     .0125 max
  • Y     .005 max
  • Ti    Balance
  • Remainder Each  .1 max
  • Remainder Total  .4 max

STANDARD SPECIFICATIONS

  • AMS 4907
  • AMS 4930
  • AMS 4931
  • AMS 4956
  • AMS 6932
  • ASTM B 348
  • ASTM F 136
  • MIL-T 9047

6-4 ELI FORGINGS

  • Ti-6AL-4V ELI Round Bar
  • Ti-6AL-4V ELI Flat Bar
  • Ti-6AL-4V ELI Rectangular Bar
  • Ti-6AL-4V ELI Rolled Rings
  • Ti-6AL-4V ELI Forged Rings
  • Ti-6AL-4V ELI Disc

OTHER PRODUCT FORMS

  • Ti-6AL-4V ELI Sheet
  • Ti-6AL-4V ELI Plate
  • Ti-6AL-4V ELI Extrusion
  • Ti-6AL-4V ELI Extrusion angles
  • Ti-6AL-4V ELI Billet
  • Ti-6AL-4V ELI Ingot
  • Ti-6AL-4V ELI Machined Parts

Titanium 6-4 ELI Physical Properties

Hardness: HRC 39 max, typical HRC 32-34.
Density: 0.161 lbs/cubic inch
Modulus of Elasticity: 16.3 msi
Coefficient of Expansion: 5.11 microinch/inch/degree F from RT to 600F

 

Machining

Ti 6al-4v ELI has a machining rating of is  22% (based on AISI AISI B1112). It is recommended to use low cutting speeds, heavy feed rates and copious amounts of cutting fluid. Chlorinated cutting fluids should be avoided to prevent contamination.

 

Welding

Ti 6Al-4V ELI has good weldability and improved over the basic grade ti-6al-4v titanium. This gain in welding, however, is at the expense of tensile/yield strength (see below). One should always use intert gas shielding and it is additionally recommended to perform post weld thermal processing. When performing fusion welding on 6-4ELI titanium, we recommend using a weld filler.

 

Forming

Ti 6-4 ELI provides slightly better forming characteristics and enhanced ductility over the regular grade Ti 6al-4v. Additionally, low temperature ductility is improved and one of primary reasons for selecting this grade. Overall, however, formability is still difficult for titanium 6-4 ELI.

 

Corrosion Resistance

Corrosion resistance for Titanium 6-4 ELI is generally excellent. Sometimes the alloy is susceptible to hot salt stress corrosion cracking. This risk can be minimized, however, with proper processing.

 

Heat Treatment

Ti-6Al-4V ELI displays limited section size hardenability, thus heat treatment is most commonly used in the annealed condition (various treatments below). Greater tensile properties, however, can be obtained by solution heat treatment followed by aging. While strength is gained from this, it is, however, at the expense of fracture toughness.

When annealing 6-4 Titanium ELI, Mill anneal (MA) is the general purpose anneal used. This is common for all mill products. One should be aware that it may not be a full anneal, however, and there may be traces of hot, cold or warm working in heavily worked products such as sheet. Duplex anneal and triplex anneal can also be used on for improved creep resistance and recrystallization anneal (RA) and beta anneal (BA) are used to improve fracture toughness. Lastly, Beta annealing should be done above the beta transus temperature.

When performing precipitation hardening, solution treatment and aging (STA) can result in a wide range of strength levels and ductility, depending on the STA cycle and the section size.  Additionally, solution treatment and overaging (STOA) can result in some increase in strength, with satisfactory toughness and dimensional stability.

 

Ti 6-4 ELI Mechanical Properties for AMS4930

MINIMUM TENSILE VALUES, INCH/POUND UNITS

Nominal Diameter of Distance Between Parallel Sides (Inches) Tensile Strength
ksi
Yield Strength at
0.2% Offset
ksi
Elongation in 4D
%
Long.
Elongation
in 4D
%
L.T.
Elongation
in 4D
%
S.T.
Reduction
of Area
%
Long.
Reduction
of Area
%
L.T.
Reduction
of Area
%
S.T.
Up to 1.500, incl 125 115 10 10 25 20
Over 1.500 to 2.000, incl 120 110 10 10 20 15
Over 2.000 to 2.500, incl 120 110 8 8 15 15
Over 2.500 to 4.000, incl 120 110 8 8 8 15 15 15

 

MINIMUM TENSILE VALUES, SI UNITS

Nominal Diameter of Distance Between Parallel Sides (Millimeters) Tensile Strength
MPa
Yield Strength at
0.2% Offset
MPa
Elongation in 4D
%
Long.
Elongation
in 4D
%
L.T.
Elongation
in 4D
%
S.T.
Reduction
of Area
%
Long.
Reduction
of Area
%
L.T.
Reduction
of Area
%
S.T.
Up to 38.10, incl 862 793 10 10 25 20
Over 38.10 to 50.80, incl 827 758 10 10 20 15
Over 50.8 to 63.50, incl 827 758 8 8 15 15
Over 63.50 to 101.60, incl 827 758 8 8 8 15 15 15

 

INTERESTED IN MORE INFORMATION?

Fill out the form on the right to request a quote from one of our professionals or call (800) 966-4922.

We are:
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Rickard Metals is also a supplier of a variety of other titanium alloys including Titanium 6-4Titanium 10-4Titanium 6-6-2Titanium 6-6-4-2Titanium 10-2-3 and Titanium Grade 4.

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