# Alloy MP35N UNS R30035: Properties and Applications
## Introduction to Alloy MP35N
Alloy MP35N, also known as UNS R30035, is a nickel-cobalt-based superalloy renowned for its exceptional combination of strength, toughness, and corrosion resistance. This unique material has found widespread use in demanding applications across various industries, particularly where extreme environments are encountered.
## Chemical Composition
The composition of MP35N plays a crucial role in its outstanding properties:
– Nickel (Ni): 35%
– Cobalt (Co): 35%
– Chromium (Cr): 20%
– Molybdenum (Mo): 10%
– Trace elements: Titanium, Iron, and others
This carefully balanced composition contributes to the alloy’s remarkable performance characteristics.
## Mechanical Properties
MP35N exhibits impressive mechanical properties that make it suitable for high-stress applications:
– Tensile Strength: Up to 300 ksi (2068 MPa) in cold-worked condition
Keyword: Alloy MP35N UNS R30035
– Yield Strength: Approximately 260 ksi (1793 MPa)
– Elongation: 8-12% in the cold-worked state
– Hardness: Up to 45 HRC when fully hardened
These properties can be further enhanced through various heat treatment processes.
## Corrosion Resistance
One of the most notable features of MP35N is its exceptional corrosion resistance:
– Excellent resistance to pitting and crevice corrosion
– Outstanding performance in chloride environments
– High resistance to stress corrosion cracking
– Maintains integrity in oxidizing and reducing acids
This makes it particularly valuable in marine and chemical processing applications.
## Physical Properties
Key physical characteristics of MP35N include:
– Density: 8.43 g/cm³ (0.304 lb/in³)
– Melting Range: 1315-1440°C (2400-2625°F)
– Electrical Resistivity: 1.05 μΩ·m
– Thermal Conductivity: 11.7 W/m·K at 20°C
## Heat Treatment and Work Hardening
MP35N responds well to various processing techniques:
– Cold working significantly increases strength
– Solution annealing at 1010-1065°C (1850-1950°F) followed by rapid cooling
– Aging treatments can further enhance mechanical properties
– The alloy maintains good ductility even in highly cold-worked conditions
## Applications of MP35N
Due to its unique combination of properties, MP35N finds use in numerous demanding applications:
### Medical Industry
– Surgical implants
– Orthopedic devices
– Dental applications
– Medical instruments
### Oil and Gas Sector
– Downhole tools
– Valve components
– Fasteners for corrosive environments
– Well completion equipment
### Aerospace Applications
– Fasteners and fittings
– Landing gear components
– High-stress structural parts
– Engine components
### Marine Engineering
– Submarine components
– Offshore platform equipment
– Propulsion system parts
– Desalination plant components
## Fabrication and Machining
Working with MP35N requires special considerations:
– Machining should be performed with rigid setups and sharp tools
– Coolants are recommended during machining operations
– Welding is possible but requires specialized techniques
– Forming operations should account for the alloy’s high strength
## Comparison with Other Alloys
MP35N offers several advantages over similar materials:
– Higher strength than most stainless steels
– Better corrosion resistance than many nickel-based alloys
– Superior fatigue resistance compared to titanium alloys
– More consistent performance in extreme environments than cobalt-chromium alloys
## Conclusion
Alloy MP35N UNS R30035 represents a remarkable engineering material that combines high strength, excellent corrosion resistance, and good biocompatibility. Its unique properties make it indispensable in critical applications where failure is not an option. As technology advances and demands for high-performance materials increase, MP35N continues