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Titanium Alloys - Ti0.3Mo0.8Ni Grade 12

Chemical Formula

Ti0.3Mo0.8Ni

Background

Highly weldable, near alpha titanium alloy exhibiting improved strength and optimum ASMA code design allowables at increased temperatures, combined with superior crevice corrosion resistance and excellent resistance under oxidising to mildly reducing conditions, especially chlorides.

Composition

Table 1. The composition of Ti0.3Mo0.8Ni

Content

C

<0.08%

N2

<0.03%

Fe

<0.3%

H2

<0.015%

O2

<0.25%

Mo

0.2-0.4%

Ni

0.6-0.9%

Ti

Balance

Designations

Other designations for Ti3Al2.5 include:

        ASTM B265 Gr12

        ASTM B348 Gr12

        ASTM B337 Gr12

        ASTM B338 Gr12

        ASTM B381 Gr12

        ASTM B467 Gr12

        ASTM F468 Gr12

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti0.3Mo0.8Ni

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.51 (0.162)

Specific Heat (J/g.K)

0.54

Volume Electrical Resistivity ohm.cm (ohm.in)

41 (20)

Thermal Conductivity W/m.K (BTU/ft.h.°F)

21 (146)

Mean Co-Efficient of Thermal Expansion 0-100°C /°C

9.5x10-6

Beta Transus °C±15°C (°F)

888 (1630)

Mechanical Properties

Table 3. Typical mechanical properties for Ti0.3Mo0.8Ni (data obtained for bar and plate 1” (25.4mm) thick, annealed.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

483 (70)

607 (88)

0.2% Proof Stress MPa (ksi)

345 (50)

462 (67)

Elongation Over 2 Inches %

18

22

Reduction in Area (%)

25

Elastic Modulus GPa (msi)

103 (15)

Hardness BHn

103 (315)

Specified Bend Radius <0.070 in x Thickness

2.0

2.5

Welded Bend Radium x Thickness

14 (10)

Stress Rupture MPa (1000hr’s at (250°C)

297

Fabrication

        Weldability – Good

        Annealing – 732-816°C (1350-1500°F)

        Stress Relief Annealing – 538-649°C (1000-1200°F), 1 hr, AC.

Source: Titanium Information Group.

For more information on this source please visit Titanium Information Group.

Comments

  1. hely alberto rincon hely alberto rincon Bolivarian Republic of Venezuela says:

    We need the Thermal and Electrical Properties of Titanium Grade 12, and rate corrosion for my thesis about material corrosion resistan in caustics solutions (NaOH) 32% and 100ºC.

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