Super Alloy 49

Topics Covered

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

Introduction

Super alloys or high performance alloys are of three types that include iron-based, cobalt-based and nickel-based alloys. These alloys are of different shapes and they contain good oxidation and creep resistance. Super alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability. Super alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods.

Super alloy 49 is an alloy of iron and nickel with chemical composition controlled for magnetic properties. The following datasheet provides an overview of super alloy 49.

Chemical Composition

The chemical composition of super alloy 49 is outlined in the following table.

Element Content (%)
Iron, Fe 51
Nickel, Ni 48
Manganese, Mn 0.50
Silicon, Si 0.35
Carbon, C 0.020

Physical Properties

The following table shows the physical properties of super alloy 49.

Properties Metric Imperial
Density 8.165 g/cm³ 0.295 lb/in³
Melting point 1427°C 2600°F

Mechanical Properties

The mechanical properties of super alloy 49 are displayed in the following table.

Properties Metric Imperial
Tensile strength 655 MPa 95000 psi
Yield strength 552 MPa 80000 psi
Elastic modulus 166 GPa 24100 ksi
Elongation at break (In 50 mm) 25% 25%
Reduction of area 62% 62%
Hardness, Rockwell B 98 98

Thermal Properties

The thermal properties of super alloy 49 are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@25-204°C/77-400°F) 8.28 µm/m°C 4.60 µin/in°F
Thermal conductivity 13.0 W/mK 90.2 BTU in/hr.ft².°F

Other Designations

Equivalent material to super alloy 49 includes ASTM A753 ALLOY 2.

Fabrication and Heat Treatment

Cold Working

Super alloy 49 can be readily cold worked. Specification of an annealed grade is required for general forming, and specification of a deep drawing grade is required for forming operation.

Welding

Super alloy 49 can be welded by conventional welding techniques.

Forging

Super alloy 49 can be forged at 1177°C (2150°F).

Forming

Standard forming techniques can be used for super alloy 49 as it has good ductility.

Machinability

Super alloy 49 has similar machining behavior like that of the austenitic stainless steels. Usage of sulfur should be avoided in the machining process as the cutting oils present in sulfur will contaminate this alloy.

Hardening

Super alloy 49 can be hardened only by being cold worked.

Heat Treatment

Super alloy 49 can be annealed at 1177°C (2150°F) for 4 h in dry hydrogen, cooled in a furnace for 1 h at 66-427°C (150-800°F) and finally cooled in air. This alloy cannot be heat-treated for strengthening purposes. Super alloy 49 can also be strain relief annealed for ½ h at 816°C (1500°F) in inert gas and dry hydrogen.

Applications

Super alloy 49 is suitable for use in magnetic shielding, transformer cores and solenoid cores. Based on the product form and purpose of application this alloy is available in 3 grades that include:

  • Strip, Rotor Grade
  • Strip, Transformer Grade
  • Bar, wire, rod and shielding strip.

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