Rickard Metals

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Ti-6AL-6V-2Sn Titanium Alloy

Titanium 6Al-6V-2Sn (also known as 6-6-2 Titanium) is an alpha-beta alloy with superior strength, solid corrosion resistance, and medium welding and fabrication ability which make it an excellent metal for rocket and aircraft casing and artillery parts. For improved ductility and strength, Ti 6-6-2 can be heat treated to desired attributes. Standard specifications for titanium 6Al-6V-2Sn include UNS R56620, AMS 4919 and more.

At Rickard Specialty Metals, we have 25+ years of supplying 6-6-2 titanium forgings to your custom measurements and shapes. Our forging process includes open die forgings, ring rolling and more. Additionally, we provide 6Al-6V-2Sn heat treatment. See below for a list of common 6-6-2 titanium forged shapes, including round and flat bar, and additional product forms we offer.

NOMINAL COMPOSITION

  • Al    5 – 6
  • V     5 – 6
  • Sn    1.5 – 2.5
  • O     .2 max
  • Fe    .35 – 1
  • Cu    .35 – 1
  • C     .05 max
  • N     .04 max
  • H     .015 max
  • Y     .005 max
  • Ti    Balance
  • Remainder Each  .1 max
  • Remainder Total  .4 max

STANDARD SPECIFICATIONS

  • UNS R56620
  • AMS 4971A
  • AMS 4978A
  • AMS 4979
  • AMS 4936
  • AMS 4918C
  • MIL-T 9046
  • MIL-T 9047

6-6-2 TITANIUM FORGINGS

  • Ti-6Al-6V-2Sn Round Bar
  • Ti-6Al-6V-2Sn Flat Bar
  • Ti-6Al-6V-2Sn Rectangular Bar
  • Ti-6Al-6V-2Sn Rolled Rings
  • Ti-6Al-6V-2Sn Forged Rings
  • Ti-6Al-6V-2Sn Disc

OTHER PRODUCT FORMS

  • Ti-6Al-6V-2Sn Sheet
  • Ti-6Al-6V-2Sn Plate
  • Ti-6Al-6V-2Sn Extrusion
  • Ti-6Al-6V-2Sn Extrusion angles
  • Ti-6Al-6V-2Sn Billet
  • Ti-6Al-6V-2Sn Ingot
  • Ti-6Al-6V-2Sn Machined Parts

Ti-6Al-6V-2Sn Additional Information:

Physical Properties

Hardness: Typical HRC 35 – 42, depending on heat treatment
Density: 0.164 lbs/cubic inch
Modulus of Elasticity: 16.3 msi
Coefficient of Expansion: 5.2 microinch/inch/degree F from RT to 600F

Welding

6-6-2 Titanium is tough to weld due to difficulty in maintaining adequate toughness in the weld zone. If you decide to weld, complete inert gas shielding is required. Post weld thermal processing is also recommended, but solution and precipitation heat treatment after welding can produce low toughness weldments.

Forming

Forming for Ti 6-6-2 is difficult. For severe forming operations it is recommended to do so at elevated temperatures.

Corrosion Resistance

Corrosion resistance is generally excellent for Ti-6Al-6V-2Sn, although like many titanium alloys, it is sometimes susceptible to salt stress corrosion cracking.

Heat Treatment

Ti 6-6-2 heat treatment is viable in various forms including bars, forgings, sheet, plate more. Heat treatment can be used in the annealed condition, as well as the solution and precipitation conditions. When heat treating bars and forgings in the Alpha beta solution, keep within the range of 1575F – 1675F for 1 hour, then water quench with precipitation heat treatment at 1050F for 4 hours. Then leave to air cool.

6-6-2 titanium bars and forgings are typically annealed in the 1275F – 1500F range. Sheet, strip and plate is typically annealed in the 1300F – 1500F range.

Forging

Typically forging for Ti-6Al-6V-2Sn is done in the alpha-beta region (1550F-1700F) to impart a mixed mode microstructure (primary alpha and transformed beta phases). Increasing amounts of work in the alpha-beta range will result in higher tensile strengths, but reduced fracture toughness. Finished forgings should have all alpha case (hard, brittle, oxygen enriched layer) removed prior to usage. Forgings will be heat treated via one of the methods mentioned in the heat treatment section prior to usage.

Mechanical Properties (Based on AMS4978)

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 2 inches or 4D
%, min Long.		 Elongation in 2 inches or 4D
%, min Trans.		 Reduction
of Area
%, min
Long.		 Reduction
of Area
%, min
Trans.
Up to 2.000, incl 150 140 to 165 10 8 20 15
Over 2.000 to 4.000, incl 145 130 to 160 10 8 15 15