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MONEL K500 (UNS N05500, 2.4375) is a age-hardenable Nickel-Copper alloy which combines the corrosion resistance of Alloy 400 with high strength corrosion fatigue and erosion resistance.These amplified properties, strength and hardness, are obtained by adding aluminum and titanium to the nickel-copper base and by a thermal processing used to effect precipitation, typically called age hardening or aging.When in the age-hardened condition, Monel K-500 has a greater tendency toward stress-corrosion cracking in some environments than Monel 400.
Alloy K-500 has approximately three times the yield strength and double the tensile strength when compared with alloy 400.Plus, it can be further strengthened by cold working prior to precipitation hardening. The strength of this nickel steel alloy is maintained to 1200° F but stays ductile and tough down to temperatures of 400° F. Its melting range is 2400-2460° F.
Grade | C≤ | Mn≤ | Si | S≤ | Cu | Fe≤ | Ni≥ | Al | Ti |
Monel K500 | 0.18 | 1.5 | 0.5 | 0.003 | 27.0-33.0 | 2.0 | 63 | 2.3-3.15 | 0.03-0.04 |
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Monel K500 | 140[965] | 100[690] | 20 |
Form | Metal Type | Bar | Wire | Sheet | Plate | Forging | Weld Wire | Weld Electrode | Din |
Standard | UNS N05500 | ASTM B865 QQ-N-286 | AMS4676 | ASTM B865 QQ-N-286 | ASTM B865 QQ-N-286 | QQ-N-286 Din 17754 | FM 60 ERNiCu-7 | FM 190 ENiCu-7 Din 17753 | 2.4375 |
Monel K500 Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS |
Monel K500 | 2.4375 | N05500 |
Hot Forming
Proper temperature during deformation is themost important factor in achievement of hot malleability.Maximum recommended heating temperature for hot-working MONEL alloy K-500 is 2100°F. Metal should becharged into a hot furnace and withdrawn when uniformlyheated. Prolonged soaking at this temperature is harmful. If a delay occurs, such that the material should be subjected toprolonged soaking, the temperature should be reduced to orheld at 1900°F until shortly before ready to work, thenbrought to 2100°F.
When the piece is uniformly heated, itshould be withdrawn. In the event of long delay, the workshould be removed from the furnace and water-quenched.The hot-working temperature range is 1600° to 2100°F. Heavy work is best done between 1900° and 2100°F; working below 1600°F is not recommended. To producefiner grain in forgings, the final reheat temperature should be2000°F and at least 30% reduction of area should be taken inthe last forging operation.
When hot working has been completed, or when it is necessary for MONEL alloy K-500 to cool before furtherhot working, it should not be allowed to cool in air butshould be quenched from a temperature of 1450°F or higher.If the piece is allowed to cool slowly it will self-heat-treat(age-harden) to some extent, and stress will be set up that may lead to thermal splitting or tearing during subsequentre heating.
In addition, quenched material has better response to age hardening, since more of the age-hardening constituent is retained in solution.The surface of the material will be oxidized to a lesser degree and will be easier to pickle if it is quenched in watercontaining about 2% by volume of alcohol.
Cold Forming
In the annealed condition, alloy K-500 canbe cold-worked by standard procedures. Although the alloyrequires considerable power to form, it has excellentductility. Its increase in hardness with increasing cold work,in comparison with other materials.
Monel K500 Applications：
Sour-gas service applications
Oil and gas production safety lifts and valves
Oil-well tools and instruments like drill collars
Pump shafts and impellers in marine service
Sensors and Electronic components
Liquid Rocket Engine Components
LOX Manifolds and Injectors
