UNS N07090 | AMS 5829 | Alloy 90 | MSRR 7137 | NiCr20Co18Ti

NIMONIC alloy 90 (UNS N07090/W. Nr. 2.4632) is a wrought nickel-chromium-cobalt base alloy strengthened by additions of titanium and aluminum. It has been developed as an age-hardenable creepresisting alloy for service at temperatures up to 920°C (1688°F).

The alloy is used for turbine blades, discs, forgings, ring sections and hot-working tools.

Composition

• Carbon………………………………………………………………0.13 max.
• Silicon …………………………………………………………………1.0 max.
• Copper………………………………………………………………..0.2 max.
• Iron……………………………………………………………………..1.5 max.
• Manganese ………………………………………………………….1.0 max.
• Chromium…………………………………………………………..18.0-21.0
• Titanium……………………………………………………………..2.0-3.0
• Aluminum …………………………………………………………..1.0-2.0
• Cobalt………………………………………………………………..15.0-21.0
• Boron ………………………………………………………………..0.02 max.
• Sulfur ………………………………………………………………0.015 max.
• Lead………………………………………………………………0.0020 max.
• Zirconium…………………………………………………………..0.15 max.
• Nickel…………………………………………………………………..Balance

Heat Treatment

The heat treatments recommended are as follows :-

• Bar 8 h/1080°C(1975°F)/AC + 16 h/700°C (1290°F)/AC
• Sheet 3 min/1150°C(2100°F)/FBQ or WQ + 1 h/925°C(1700°F)/AC + 4 h/750°C (1380°F)/AC
• Welded sheet 3 min/1150°C(2100°F)/FBQ or WQ + weld + 1 h/925°C(1700°F)/AC + 4 h/750°C(1380°F)/AC
• Interstage anneal of sheet 20 min/1040°C (1900°F)/AC or WQ

The data for sheet have been obtained from material given a second stage interstage anneal (20 min/1040°C(1900°F)/AC), which is purely a softening treatment. Improved tensile and rupture ductility can be achieved by using 1 h/925°C(1700°F)/AC as the second stage heat treatment.

Physical Properties

• Density,
•          Mg/m3 …………………………………………………………..8.18
•           lb/in3 …………………………………………………………..0.296
• Melting Range Liquidus temperature,
•          °C …………………………………………1370
•          °F …………………………………………2500
• Solidus temperature,
•          °C…………………………………………..1310
•          °F …………………………………………..2390

The density has been determined on extruded bar, extruded bar subsequently forged and extruded section subsequently cold rolled given a heat treatment of 8 h/1080°C (1975°F)/AC + 16 h/700°C (1290°F)/AC

Specifications

UNS N07090
Werkstoff Nr. 2.4632
Werkstoff Br. 2.4969
NiCr20Co18Ti
NCK20TA (AIR 9165)
BS HR2
AMS 5829
MSRR 7137, MSRR 7017

 

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