Background

Ti5Al1Sn1Zr1V0.8Mo is an alpha alloy with intermediate strength which was developed by Timet in conjunction with the US Navy. It is sometimes referred to as ‘The Navy Alloy’.

Ti5Al1Sn1Zr1V0.8Mo is fully weldable and displays the highest toughness of any allot in the ASTM series. It is ideally suited to applications in marine and offshore industry environments where toughness and corrosion resistance are essential. The alloy has similar corrosion resistance to commercially pure titanium in sea water and there are no concerns for stress corrosion cracking (SCC). Ti5Al1Sn1Zr1V0.8Mo also has excellent room temperature creep strength.
Composition

Table 1. The composition of Ti5Al1Sn1Zr1V0.8Mo.




Content

Al


4.5-5.5%

Sn


0.6-1.4%

Zr


0.6-1.4%

V


0.6-1.4%

Mo


0.6-1.2%

Si


0.06-0.14%

H2


<0.015%

Fe


<0.25%

N2


<0.03%

O2


<0.11%

C


<0.08%

Ti


Balance
Designations

Other designations for Ti5Al1Sn1Zr1V0.8Mo include:

· ASTM B265 Gr32

· ASTM B348 Gr32

· ASTM B381 Gr32

· ASTM B863 Gr32

· ASTM F467M Gr32

· ASTM F468M Gr32

· UNS R55111
Key Properties
Physical Properties

Table 2. Typical physical properties for Ti5Al1Sn1Zr1V0.8Mo.

Property


Typical Value

Density g/cm3 (lb/ cu in)


4.43 (0.160)

Specific Heat J/Kg/°C (BTU/lb/°F)


530 (0.127)

Thermal Conductivity W/m.K (BTU.in/ft2.hr)


7.5 (52)

Mean Thermal Expansion Co-eff 0-100°C /°C (/°F)


8.7 (4.8)

Mean Thermal Expansion Co-eff 0-200°C /°C (/°F)


9.1 (5.1)

Mean Thermal Expansion Co-eff 0-300°C /°C (/°F)


9.4 (5.2)

Beta Transus °C±15°C (°F)


980 (1796)
Mechanical Properties

Table 3. Typical mechanical properties for Ti5Al1Sn1Zr1V0.8Mo 1 and 2 inch plate.

Property


Direction L


Direction T

Tensile Strength MPa (ksi) sheet


835 (121)


865 (125)

0.2% Proof Stress MPa (ksi)


720 (104)


775 (112)

Elongation over 4D %


13


14

Reduction in Area %


28


29

Table 4. Typical mechanical properties for Ti5Al1Sn1Zr1V0.8Mo 3/8 inch plate (9.5mm).

Property


Direction L


Direction T

Tensile Strength MPa (ksi) sheet


814 (118)


883 (128)

0.2% Proof Stress MPa (ksi)


710 (103)


807 (117)

Elongation over 4D %


15.5


15

Reduction in Area %


29


35

Table 5. Typical mechanical properties for Ti5Al1Sn1Zr1V0.8Mo 0.05 inch sheet (1.3mm).

Property


Direction L


Direction T

Tensile Strength MPa (ksi) sheet


910 (132)


965 (140)

0.2% Proof Stress MPa (ksi)


800 (116)


889 (129)

Elongation over %


10


11.5

Table 6. Typical mechanical properties for Ti5Al1Sn1Zr1V0.8Mo 5/8 inch bar.

Property


Direction L

Tensile Strength MPa (ksi) sheet


869 (126)

0.2% Proof Stress MPa (ksi)


800 (116)

Elongation over 4D %


16

Reduction in Area %


39
Fabrication

Weldability – Good
Applications

As mentioned above, Ti5Al1Sn1Zr1V0.8Mo is suited to in marine and offshore industry environments where toughness and corrosion resistance are essential.