Grade 12 Ti 0.3 Mo 0.8 Ni (UNS R53400)

Topics Covered

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

Introduction

Titanium mixed with other chemical elements such as molybdenum, aluminum, nickel, and zirconium produces a wide range of titanium alloys.

Grade 12 Ti 0.3 Mo 0.8 Ni is a commercially pure wrought alloy. This alloy has excellent strength at high temperatures coupled with excellent weldability and crevice corrosion resistance.

The following sections will discuss in detail about grade 12 Ti 0.3 Mo 0.8 Ni alloy.

Chemical Composition

The chemical composition of grade 12 Ti 0.3 Mo 0.8 Ni alloy is outlined in the following table.

Element Content (%)
Nickel, Ni 0.6 - 0.9
Iron, Fe 0.3 max
Molybdenum, Mo 0.2 - 0.4
Oxygen, O 0.25 max
Carbon, C 0.08 max
Nitrogen, N 0.03 max
Hydrogen, H 0.015 max
Titanium, Ti Remainder

Physical Properties

The physical properties of grade 12 Ti 0.3 Mo 0.8 Ni alloy are tabulated below.

Properties Metric Imperial
Density 4.50 g/cm3 0.163 lb/in3
Melting point ≤ 1660°C ≤ 3020°F

Mechanical Properties

The following table shows mechanical properties of grade 12 Ti 0.3 Mo 0.8 Ni alloy.

Properties Metric Imperial
Tensile strength 550 MPa 79800 psi
Yield strength 380 MPa 55100 psi
Poisson’s ratio 0.37 0.37
Elastic modulus 105 GPa 15200 ksi
Shear modulus 45.0GPa 6530 ksi
Elongation at break 12 % 12 %
Hardness, Brinell 180 - 235 180 - 235
Hardness, Knoop 222 222
Hardness, Rockwell C 11 11
Hardness, Vickers 209 209

Thermal Properties

The thermal properties of grade 12 Ti 0.3 Mo 0.8 Ni alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 8.60 µm/m°C 4.78 µin/in°F
Thermal conductivity 19 W/mK 132 BTU in/hr.ft².°F

Other Designations

Equivalent materials to grade 12 Ti 0.3 Mo 0.8 Ni alloy are as follows:

  • ASTM B265 (12)
  • ASTM B337 (12)
  • ASTM B338 (12)
  • ASTM B348 (12)
  • ASTM B381 (F-12)

Fabrication and Heat Treatment

Machinability

Grade 12 Ti 0.3 Mo 0.8 Ni alloy can be machined using slow speeds, right quantity of coolant flow 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 12 Ti 0.3 Mo 0.8 Ni alloy can be hot or cold formed.

Welding

Weldabilty of grade 12 Ti 0.3 Mo 0.8 Ni alloy is rated as excellent.

Annealing

For annealing grade 12 Ti 0.3 Mo 0.8 Ni alloy, the material has to be heated to 732-816°C (1350-1500°F), held for 2 h followed by air cooling. In case of intermediate stress relieving, the material has to be heated to 538-649°C (1000-1200°F) and held for 1 h followed by air cooling.

Forging

Rough forging can be performed at 871°C (1600°F) and completed at 788-843°C (1450-1550°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 12 Ti 0.3 Mo 0.8 Ni alloy is used in the following application areas:

  • Pumps
  • Valves
  • Heat exchangers
  • Pipes and fittings
  • Chemical processing
  • In high temperature chemical manufacturing equipment
  • Marine and airframe components
  • In medium reducing or variable oxidizing-reducing media - containers

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