Monel 450, also known as “Alloy 450”, is a copper-nickel alloy of the 70-30 type which has superior weldability. It is resistant to corrosion and bio-fouling in seawater. The Alloy 450 has good fatigue strength, and has relatively high thermal conductivity. It widely used for seawater condensers, condenser plates, distiller tubes, evaporator tubes, heat exchanger tubes and saltwater piping. Usually, the welding processes for Monel 450 alloys include gas tungsten arc welding(GTAW), gas metal arc welding(GMAW), and submerged-arc welding(SAW) with the Monel filler metal 67.
Overview:
Monel 450 or Alloy 450, houses a 70-30 combination of copper and nickel, respectively. This variant of the Monel alloy family comes with superior weldability. The alloy possesses fair resistance to bio-fouling or corrosion in the seawater.
With this alloy, you also get access to high fatigue strength along with optimum thermal conductivity. The Monel 450 is used excessively for the creation of condenser plates, seawater condensers, evaporator tubes, distiller tubes, saltwater piping, as well as tubes for heat exchange.
Common Names:
- Alloy 450
- UNS N45000
Executive Standards:
- ASME SB-111
- SB-171
- SB-359
- SB-395
- SB-466
- SB-467
- SB-543
- Boiler Code Sections III, IV, VIII, IX
- SAE J461, J463
- MIL-C-15726
- MIL-T-15005
- MIL-T-16420
- MIL-T-22214
- Monel Nickel-Copper Alloy
- UNS C71500
- CDA 715
- ASTM B 111
- B 171
- B 359
- B 543
- B 552
- B 122
- B 151
- B 466
- B 395
- B 432
- B 467
Chemical Properties:
Nickel (%) Copper (%) Iron (%) Manganese (%) Sulfur (%) Zinc (%) Lead (%) Phosphorous (%) 29.0 to 33.0 Balance 0.4 to 1.0 1.0 Maximum 0.020 Maximum 1.0 Maximum 0.05 Maximum 0.020 Maximum Mechanical Properties:
Yield Strength (Minimum) Tensile Strength (Minimum) Elongation (Minimum) KSI MPA KSI MPA Percentage 24 165 56 385 46 Physical Properties:
Density Thermal Conductivity Melting Range Electrical Resistivity G/CM3 W/M.K °C °F µΩ·m 8.91 29.4 1170 to 1240 2140 to 2260 412 Key Features:
- Superior Weldability: Given its combination of 70% copper and 30% nickel, it provides top-notch weldability.
- Enhanced Fatigue Strength: The Monel 450 alloy can handle relatively high stress under exclusive circumstances, given its excellent fatigue strength.
- Corrosion Resistance: The Monel 450 has amazing corrosion resistance against strong alkali, seawater, organic compounds, neutral solutions, and so on.
Product Forms Available:
- Hexagon
- Round
- Flats
- Forging Stock
- Tube
- Pipe
- Plate
- Wire
- Sheet
Applications:
- Seawater Condensers
- Distiller Tubes
- Condenser Plates
- Evaporator Tubes
- Heat Exchanger
- Piping for Salt Water
Possible Alternative Grades:
1-Monel 400: Backed by excellent resistance to corrosion and high-strength, this nickel-copper alloy is the most popular among all Monel alloys.
2-Monel 401: It is a copper-nickel based alloy which is designed for specialized electronic applications. Plus, the Monel 401 alloy houses a low coefficient in terms of temperature resistance.
3-Monel R-405: This free-machining variant of the Alloy 400 houses controlled sulfur that acts as an efficient chip breaker while machining.
4-Monel K-500: This alloy made from nickel and copper is precipitation-hardened. It also comes with low permeability, which isn’t magnetic when kept under -150oF.
Frequently Asked Questions:
- Is the Monel alloy similar to steel?
The Monel alloy is a binary alloy derived as a solid solution. Monel isn’t similar to steel. However, they are way more expensive when compared to stainless steel given their wide range of applications.
- How to differentiate between Monel and Stainless Steel?
Monel possesses a slight greenish tint, while stainless steel is pretty easy to notice. The latter is silvery but isn’t as shiny unless buffed. Monel also has better saltwater resistance when compared to SS.
- What is the meaning of the term “Monel”?
As per certain users, the term “Monel” comes with a Hebrew origin, which means something that has been chosen by the supreme God.
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