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 has been obtained from material is 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.
Available Products and Specifications
NIMONIC alloy 90 is designated as UNS N07090 and Werkstoff Number 2.4632. Standard product forms are sheet, strip, plate, round bar, flat bar, forging stock, wire and extruded section.
Rod, Bar, Wire and Forging Stock – BS HR2, HR501, HR502 and HR503; SAE AMS 5829; AECMA PrEN 2295, 2296, 2297, 2400, 2401, 2669 and 2670.
Plate, Sheet and Strip– BS HR202, AECMA PrEN 2298.
Pipe and Tube – BS HR402, AECMA PrEn 2299.
