Super Alloy Nimonic 75 (UNS N06075)

Topics Covered

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

Introduction

Nimonic 75 alloy is a nickel-chromium alloy that has good mechanical properties and oxidation resistance at elevated temperatures. The alloy is strengthened by the addition of titanium.

The following datasheet will discuss in detail about nimonic 75 alloy.

Chemical Composition

The chemical composition of nimonic 75 alloy is outlined in the following table.

Element Content (%)
Chromium, Cr 18-21
Iron, Fe 5
Manganese, Mn 1
Silicon, Si 1
Copper, Cu 0.5
Titanium, Ti 0.2-0.6
Carbon, C 0.08-0.15
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nimonic 75 alloy.

Properties Metric Imperial
Density 8.37 g/cm3 0.302 lb/in3
Melting point 1340-1380°C 2440-2520°F

Mechanical Properties

The mechanical properties of nimonic 75 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength (Annealed) 750 MPa 109000 psi
Yield strength (Annealed) 275 MPa 39900 psi
Elongation at break (Annealed prior to test) 42% 42%

Thermal Properties

The thermal properties of nimonic 75 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 11 µm/m°C 6.11 µin/in°F
Thermal conductivity 11.7 W/mK 81.2 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Nimonic 75 alloy can be machined using conventional machining techniques used for iron-based alloys.

Forming

The alloy has good ductility, and can be readily formed using all conventional methods.

Welding

Nimonic 75 alloy can be welded using conventional welding techniques such as gas-tungsten arc welding, shielded metal-arc welding and submerged-arc welding.

Heat Treatment

The alloy can be annealed at (1925°F) and then air cooled.

Forging

The alloy can be hot forged at temperatures in the range of 982 to 1204°C (1800 to 2200°F).

Cold Working

Cold working of this alloy can be done using standard tooling.

Annealing

The alloy can be annealed at 1052°C (1925°F) and air cooled.

Hardening

The alloy can be hardened by cold working.

Other Designations

Other designations that are equivalent to nimonic 75 alloy include the following:

  • DIN 2.4630
  • DIN 2.4951

Applications

The following are the list of applications of nimonic 75 alloy:

  • Gas-turbine engines
  • Industrial furnaces
  • Heat-treating equipment and fixtures
  • Nuclear engineering.

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