NIMONIC® alloy 90


Nickel Alloy 90/ Nimonic 90®

Nimonic alloy 90 is a precipitation hardenable nickel-chromium-cobalt alloy strengthened by the addition of Titanium and Aluminium. Alloy 90 has a high stress rupture strength and creep-resistant at temperatures to 920°C. Nimonic Alloy 90 is typically used in extreme stress applications such as turbine blades, hot working tools, exhaust reheaters, disc and high-temperature springs.

The recommended heat treatments for Nimonic 90 are as follows:
Nimonic 90 Bar
Solution Treatment – 1080 °C (1975 °F) for 8 hours + air cool or oil/ water quench
Precipitation Heat Treatment (As per BS HR2) – 700 °C (1290 °F) for 16 hours + air cool

Nimonic 90 Sheet
Solution Treatment – 1100-1150 °C for 1-10 minutes + air cool or oil /water quench
Stabilization Heat Treatment – 925 °C for 1 hour + air cool
Precipitation Heat Treatment – 750 °C for 4 hours and air cool
(BS HR202/ MSRR 7016 / Siemens TLV 85252100 do not require the Stabilization Treatment stage)

Chemical Composition Limits
Weight %NiCrCoTiAlCSiCuFeMnBSZrPb
Alloy 90Bal18-2115-212-31-20.2 max1.0 max0.2 max1.5 max1.0 max0.02 max0.015 max0.15 max0.0020 max

Typical Mechanical Properties

Extruded Bar
Temperature °CYield Strength 0.2 % (MPa)Tensile Strength (MPa)Elongation (%)Hardness HV
Nimonic 90 bar
Solution Treated (BS HR2)
RT295 max
Nimonic 90 bar
Precipition Treated (BS HR2)
RT695 min1080 min20 min310 min
Nimonic 90 Bar
Precipitation Treated (BS HR2)
500672 (typical)1038 (typical)31
Temperature °CYield Strength 0.2 % (MPa)Tensile Strength (MPa)Elongation (%)Hardness HV
Nimonic 90 sheet
Solution Treated (BS HR202)
RT250 max
Nimonic 90 sheet
Precipitation Treated
(BS HR202)
RT695 min1080 min25 min
280 min
Nimonic 90 sheet
Precipitation Treated
(BS HR 202)
500740 (typical)995 (typical)30
Alloy 90 Cold Rolled Sheet
(Heat Treated)

Nimonic Alloy 90 (Nimonic 90) is available in sheet, strip, plate, bar, round bar, flat bar, wire, forging stock, tube, welding wire and extruded section.

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

Nimonic 90 bar/wireNimonic 90 sheet/plate/stripNimonic 90 Tube
BS HR2 Nimonic 90 bars, billet, forgingsBS HR202 Nimonic 90 sheet and stripBS HR 402
BS HR501 Nimonic 90 cold drawn wire for springsMSRR 7087AECMA PrEN 2299
BS HR502 Nimonic 90 cold drawn and solution treated wire for springsAECMA PrEN 2298 
BS HR503 Nimonic 90 wire for thread insertsSiemens TLV8525 2100 
AMS 5829Siemens TLV8525 31001 
AECMA PrEN 2295  
AECMA PrEN 2296  
AECMA PrEN 2297  
AECMA PrEN 2400  
AECMA PrEN 2401  
AECMA PrEN 2669  
AECMA PrEN 2670  
MSRR 7016  
MSRR 7137  
Siemens DL 1641-1  
ABB Stal 63 73 01