Nimonic alloy 75

  • Excellent scaling resistance at high temperature
  • Medium strength at high temperature
  • Easily welded and fabricated
  • Good corrosion resistance
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The Nimonic alloy 75 is a Nickel-Chromium based alloy that comprises 80% nickel, 20% chromium, and with some additions of Carbon and Titanium. Also, this alloy exhibits good corrosion resistance and heat tolerance and provides medium strength at higher temperatures. This alloy came into being as the blades of turbines in the 1940s.

Nimonic 75 is readily used in many industries for its excellent weldability and fabrication properties. It finds uses in aerospace and nuclear industries, along with the other industries involving heat treatments.

Common Names:

  • UNS N06075
  • BS HR5
  • HR203
  • HR403
  • HR504
  • DIN 17742
  • DIN 17750-17752

Executive Standards:

Rod, Bar, Wire, and Forging Stock

  • BS HR 5, 504
  • DIN 17752
  • AECMA PrEN 2306, 2307, 2402
  • ISO 9723, 9724, 9725
  • MSRR 7004

Plate, Sheet, and Strip

  • BS HR 203
  • DIN 17750
  • AECMA PrEN2293, 2302, 2411
  • ISO 6208
  • MSRR 7104

Pipe, and Tubes

  • BS HR 403
  • DIN 17751
  • AECMA PrEN2294
  • ISO 6207


  • DIN 17742
  • AECMA PrEN2308

Chemical Properties:

Nickel (%)70-80
Chromium (%)18-21
Iron (%)Max 5
Silicon (%)Max 1
Manganese (%)Max 1
Others (%)remainder

Mechanical Properties:

Yield Strength (MPa)275
Yield Strength (ksi)40
Tensile Strength (MPa)750
Tensile strength (ksi)109
Break Elongation42%
Elasticity Modulus (GPa)206
Elasticity Modulus (ksi)29878

Physical Properties:

Expansion Coefficient70-212oF6.1 x 10-6
20-100 oC11.0
Specific heatJ/kg-°C461
Thermal ConductivityW/m-°C11.7
Melting pointoF2450-2520

Key Features:

  • Great scaling resistance at high temperature: This Nimonic alloy is well regarded for its amazing scaling resistance at a high temperature. Thus, it finds its usage in sheet applications, where medium strength is enough. Also, it is used in the manufacturing of machine parts implemented in thermal processing, heat-treatment equipment, etc.
  • Excellent corrosion resistance: Nimonic 75 is well-known for being an alloy that efficiently tackles corrosive acids and gases, thus offering flexibility in its use across multiple manufacturing plants.
  • Easy fabrication and welding: This alloy is particularly famous for offering high weldability, even by using standard techniques. Also, it can be readily fabricated in quite less time and labor involvement.

Product Forms Available:

  • Bars
  • Rods
  • Wires
  • Forging stock
  • Plate
  • Sheet
  • Strip
  • Pipe
  • Tubes
  • Extruded section
  • Hexagon flats


  • Aerospace sheet metal fabrication
  • Components of gas turbine engines
  • Industrial furnace parts
  • Heat treatment equipment and fixtures
  • Nuclear engineering
  • Thermal processing industries

Possible Alternate Grades:

  • Nimonic alloy 105: This superalloy can handle high temperatures and also offer excellent ductility and weldability. It is efficiently used for making turbine blades, bolts, and fasteners.
  • Nimonic 90: The alloy Nimonic 90 is an age-hardenable creep-resisting alloy used for services at temperatures up to 920°C. It can efficiently handle stress and hence used in making turbine blades, hot working tools, etc.

Frequently Asked Questions:

  • What are the pre-requisites for welding Nimonic 75?

The pre-requisite is that the alloy should be annealed before welding.

  • What is the ideal temperature for hot-working of this material?

Hot-working of this alloy can be done at temperature ranges of 1220-950°C (2230-1740°F).

  • What kind of machining techniques can be used for Nimonic 75?

The conventional machining techniques used for iron alloys can be used here as well.

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