Grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo Alloy (UNS R58153)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Forming
     Annealing
     Forging
     Hot Working
     Cold Working
Applications

Introduction

Titanium alloys are metals containing a combination of titanium and other chemical elements. They are lightweight and corrosion resistant. Grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy is a beta wrought alloy. This alloy has good ductility and high strength.

The following sections will discuss in detail about grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy.

Chemical Composition

The chemical composition of grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy is outlined in the following table.

Element Content (%)
Titanium, Ti 75
Vanadium, V 8
Chromium, Cr 6
Zirconium, Zr 4
Molybdenum, Mo 4
Aluminum, Al 3
Iron, Fe ≤ 0.30
Oxygen, O ≤ 0.14
Carbon, C ≤ 0.050
Nitrogen, N ≤ 0.030

Physical Properties

The physical properties of grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy are tabulated below.

Properties Metric Imperial
Density 4.82 g/cm3 0.174 lb/in3
Melting point 1555 - 1650°C 2831 - 3000°F

Mechanical Properties

The following table shows mechanical properties of grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy.

Properties Metric Imperial
Tensile strength 1240 MPa 180000 psi
Yield strength 1170 MPa 170000 psi
Poisson’s ratio 0.33 0.33
Elastic modulus 104 GPa 15100 ksi
Shear modulus 40 GPa 5800 ksi
Elongation at break 7% 7%
Hardness, Brinell 351 351
Hardness, Knoop 382 382
Hardness, Rockwell C 38 38
Hardness, Vickers 367 367

Thermal Properties

The thermal properties of grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 8.30 µm/m°C 4.61 µin/in°F
Thermal conductivity 6.20 W/mK 43.0 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

Although tough, grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy can be machined using the right quantity of coolant flow, slow speeds and high feed rates. High-speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt based.

Forming

Grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy can be hot or cold formed.

Annealing

Annealing of this material can be performed by heating to 704°C (1300°F), and holding for 2 h, which is followed by air cooling. In the case of intermediate stress relieving, the material should be heated to 482-538°C (900-1000°F) and held for 45 min.

Forging

Rough forging can be performed at 900°C (1650°F) and completed at 843°C (1550°F).

Hot Working

Hot working enhances the overall ductility of the material.

Cold Working

Cold working features of this material is same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.

Applications

Grade 19 Ti 3Al 8V 6Cr 4Zr 4Mo alloy is used in the following application areas:

  • In tubulars in oil and gas wells
  • Fasteners
  • Torsion bars
  • Springs
  • Foil.

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