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Titanium Alloys - Ti3Al8V6Cr4Mo4Zr Grade 19 and 20

Feb 11 2003

Chemical Formula

Ti3Al8V6Cr4Mo4Zr

Background

Ti3Al8V6Cr4Mo4Zr Grade 19 (Beta C)

This metastable beta alloy is strip producible and cold formable. The alloy has been used for springs, fasteners, torsion bars and as extruded tubulars for deep sour well applications and is listed with the MR0175 approved alloys. The alloy is heat treatable to a wide range of strengths.

Beta C Grade 20

Grade 20 has identical mechanical and physical properties to Grade 19 but has the addition of palladium (0.04-0.08%) to increase its corrosion resistance in extreme sour environments at elevated temperature.

Composition

Table 1. The composition of Ti3Al8V6Cr4Mo4Zr.

Content

C

<0.05%

N2

<0.03%

O2

<0.14%

Al

3.0-4.0%

V

7.5-8.5%

Cr

5.5-6.5%

Zr

3.5-4.5%

Mo

3.5-4.5%

Ti

Balance

Designations

Other designations for Ti3Al8V6Cr4Mo4Zr include:

•         ASTM Grade 19 and Grade 20 (with 0.05% Pd)

•         AMS 4957

•         AMS 4958

•         AMS 4945

•         MIL –T –9046 B3

•         MIL –T –9047

•         UNS R58640 (Grade 19)

•         UNS R58645 (Grade 20)

Key Properties

Physical Properties

Table 2. Typical physical properties for Ti3Al8V6Cr4Mo4Zr.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.81 (0.173)

Melting Range °C±15°C (°F)

1649 (3000)

Beta Transus °C±15°C (°F)

793 (1459)

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

8.4 (4.9)

Mean Co-Efficient of Thermal Expansion 0-100°C /°C (0-212°F /°F)

9.4x10-6 (5.2)

Mean Co-Efficient of Thermal Expansion 0-300°C /°C (0-572°F /°F)

9.7x10-6 (5.4)

Mechanical Properties

Table 3. Typical mechanical properties for Ti3Al8V6Cr4Mo4Zr.

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

1172 (170)

1248 (181)

0.2% Proof Stress MPa (ksi)

1104 (160)

1152 (167)

Elongation Over 2 Inches (%)

6

10

Reduction in area (%)

19

Elastic Modulus GPa (msi)

103 (15)

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Fabrication

•         Weldability – Fair

•         Forging – Rough 871-927°C (1600-1000°F), finish 871-927°C (1600-1000°F)

•         Annealing – 816°C (1500°F), 30min, AC

•         Solution Treating – 816°C (1500°F), 30 min, WQ.

•         Ageing – 454-538°C (850-1000°F), 2-4hr, AC.

Source: The Titanium Information Group

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

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