Nimonic 75

Nickel Alloy 75 | UNS N06075 | AMS 5715 | MSRR 7004 | AFNOR NC 20T | BS HR 5 | DIN 17752

A nickel-chromium alloy with good mechanical properties and oxidation resistance at high temperatures. Used for sheet-metal fabrications in gas-turbine engines, for components of industrial furnaces, for heat-treating equipment and fixtures, and in nuclear engineering.

NIMONIC alloy 75 (UNS N06075/W.Nr. 2.4951 & 2.4630) is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon. First introduced in the 1940s for turbine blades in the prototype Whittle jet engines, it is now mostly used for sheet applications calling for oxidation and scaling resistance coupled with medium strength at high operating temperatures. It is still used in gas turbine engineering and also for industrial thermal processing, furnace components and heat-treatment equipment. It is readily fabricated and welded.

Chemical Composition

  • Carbon ………………………………………………………………0.08-0.15
  • Chromium…………………………………………………………..18.0-21.0
  • Copper………………………………………………………………..0.5 max.
  • Iron……………………………………………………………………..5.0 max.
  • Manganese ………………………………………………………….1.0 max.
  • Silicon …………………………………………………………………1.0 max.
  • Titanium………………………………………………………………0.2-0.6
  • Nickel………………………………………………………………….Balance

Reference to the balance of the alloy composition does not guarantee this is exclusively of the element mentioned but that it predominates and others are present only in minimal quantities.

Physical Properties

Some physical properties for NIMONIC alloy 75 are given in Tables 2-4. Thermal expansion data in Table 3 were determined on fully heat-treated material. The data are subject to a variation of approximately ±5% according to processing variables. The dynamic modulus data in Table 4 were obtained from fully heattreated cylindrical specimens vibrated in the flexural mode. The recommended heat treatments are quoted in the Heat Treatment section of this bulletin.

Physical Properties

  • Density*, Mg/m3 ………………………………………………………….8.37
  •                   lb/in3 ………………………………………………………….0.302
  • Melting Range,
  •        °C……………………………………………..1340-1380
  •        °F ……………………………………………..2450-2520
  • Specific Heat,
  •           J/kg•°C……………………………………..461 at 20°C
  •           Btu/lb•°F………………………………….0.110 at 68°F
  • Thermal Conductivity,
  •           W/m•°C…………………………11.7 at 20°C
  •           Btu•in/ft2 •h•°F ………………..81.1 at 68°F
  • Electrical Resistivity,
  •          µΩ•m………………………………1.09 at 20°C
  •          Ω•circ•mil/ft ………………………656 at 68°F

Dependent on processing variables.

Specifications

Werkstoff Nr 2.4630,
W. Nr 2.4951,
UNS N06075,
Nimonic 75 (tradename),
MSRR 7104 and MSRR 7004,
AFNOR NC 20T,
BS HR 5, BS HR 504,
DIN 17752, DIN 17742,
ISO 9723, ISO 9724, ISO 9725,
AECMA PrEN2306, AECMA PrEN2307, AECMA PrEN2306, AECMA Pr EN2307,
AECMA PrEN2402, AECMA PrEN2308

 

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