A 494/A 494M – 09
Standard Specification for Castings, Nickel and Nickel Alloy
Grade：M25S
UNS Numbers：N24025
Alloy Family：Ni-Cu
M25S nickel alloy castings Chemical Requirements：
C(max):0.25
Mn（max）：1.50
Si（max）：3.5-4.5
P（max）：0.03
S（max）：0.03
Cu: 27.0-33.0
Fe：max 3.50
Ni：balance
M25S nickel alloy castings Mechanical Properties
Hardness HB：300 HB minimum for the age hardened condition
Heat Treat Requirements
M25S Class 1 ：As cast
M25S Class 2：Load into furnace at 600°F [315°C] maximum. Heat to 1600°F [870°C] and hold for 1 h plus an additional 30 min for each 1⁄2 in. [13 mm] of cross section over 1 in.B Cool to 1300°F [705°C]C and hold at temperature for 30 min then quench in oil to room temperature.
(B: For cross sections over 6 in. [125 mm], it may be necessary to increase the hold time if maximum softness is desired.)
M25S.Class 3： Load into furnace at 600°F [315°C] maximum. Heat slowly to 1100°F [605°C] and hold to develop maximum hardness. Furnace or air cool to room temperature
Keywords
Corrosion-resistant applications；nickel；nickel alloy castings；
Nickel alloys；nickel castings