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MP35N® - LTi • UNS R30035

MP35N® strip and foil (UNS R30035) is a nonmagnetic nickel-cobalt-chromium molybdenum alloy that has excellent corrosion resistance. It can obtain ultra-high tensile strengths (300 ksi) through work hardening and aging and has good toughness and ductility, making it ideal for demanding, high‑reliability and high‑strength applications.

What are the applications for MP35N® Strip?

Applications for MP35N® strip and foil include orthodontic brackets, electrical components, spring contacts, medical instruments such as stents, implant electronic connectors, chemical, food processing and marine environments.

How Does Work Hardening Enhance the Ultra‑High Strength of MP35N® Strip?

After work hardening, MP35N® strip alloy can be aged in the temperature range of 800/1200°F for increased strength. MP35N® will only respond to aging if in the work hardened condition. Service temperatures up to 750°F are recommended for work hardened material.

MP35N® strip can be successfully TIG welded and can be produced by double vacuum melting, and as such, has a low nonmetallic inclusion level.  

What Sizes Are Available for MP35N® Strip and Foil?

MP35N® strip is available from Hamilton Precision Metals as strip product in thicknesses from 0.0005” to 0.030” (0.0127 mm to 0.762 mm) and widths to 5.0” (127 mm).

An MP35N® foil product is available in thicknesses down to 0.0001” (0.00254 mm) and widths of 4.0” (101.6 mm). The material corresponds to UNS R30035.

What Is the Nominal Composition of MP35N® Strip?

MP35N® - LTi NOMINAL COMPOSITION
Nickel 35%
Cobalt 33.5%
Chromium 20.5%
Molybdenum 9.5%
Titanium 0.01%
Iron 0.5%
Carbon 0.01%
Boron 0.01%

What Mechanical Properties Characterize MP35N® Strip?

MP35N® - LTi MECHANICAL PROPERTIES

ANNEALED COLD ROLLED COLD ROLLED &
HEAT TREATED
Ultimate Tensile Strength 135,000 PSI 275,000 PSI 300,000 PSI
Yield Strength (0.2% Offset) 57,000 PSI 240,000 PSI 290,000 PSI
Elongation in 2” * 40% 1% 1%
Rockwell Hardness RB 94 RC 50 RC 55
Modulus of Elasticity 33.76 ksi x 103 - -
 

What Physical Properties Characterize MP35N® Strip?

MP35N® - LTi PHYSICAL PROPERTIES
Density 0.304 lbs./cu.in.
Melting Point (Approx.) 2400°F
Electrical Resistivity @ R.T. 103 Microhm·cm
Thermal Expansion Coeffiecient (RT to 200°C) 13.7 ppm/°C
Thermal Conductivity @ R.T. 11.2 W/m·K
Magnetic Permeability @ R.T 1.0009
MP35N®-LTi is a registered trademark of SPS Technologies Inc.

MP35N® LTi is preferred when applications demand both ultra-high strength and exceptional corrosion resistance simultaneously. Unlike most materials, it combines the strength of high-alloy steels with the corrosion resistance of advanced superalloys, making it ideal for mission-critical environments.

It offers a rare combination of:

  • Ultra-high tensile strength (up to ~300 ksi)
  • Excellent toughness and ductility
  • Resistance to fatigue and stress cracking

This makes it ideal for applications where failure is not an option, such as aerospace, medical, and energy systems.

The alloy provides outstanding resistance to:

  • Seawater and chloride environments
  • Hydrogen sulfide (sour gas) environments
  • Pitting, crevice corrosion, and stress corrosion cracking

This allows reliable operation in marine, chemical, and oil & gas conditions where conventional materials fail. 

The alloy is:

  • Biocompatible and non-magnetic
  • Highly stable in body fluids
  • Resistant to corrosion and wear over time

These properties make it suitable for Orthodontic Brackets, Implantable Devices, Stents, and Medical Connectors.

Considerations include:

  • Higher material and processing cost
  • Increased difficulty in machining due to high hardness
  • Need for controlled processing (cold work + aging)

However, these are often justified in high-value, failure-critical applications.

Its properties are developed through:

  • Cold working (work hardening)
  • Aging (heat treatment)

These processes significantly increase strength while maintaining ductility, allowing the material to be tailored for specific performance requirements. 

MP35N® stands out because it combines:

  • Strength of ultra-high-strength alloys
  • Corrosion resistance beyond most stainless steels
  • Biocompatibility for medical use

Most materials offer only one or two of these properties—not all three together. 

 

Typical use cases include:

  • Precision springs and electrical contacts
  • Implantable medical devices and connectors
  • Orthodontic brackets
  • Aerospace and energy components
  • Marine and chemical processing systems

These applications require extreme reliability under stress and harsh conditions.

Key considerations include:

  • Required strength vs formability
  • Exposure to corrosive or high-stress environments
  • Fatigue and lifecycle requirements
  • Regulatory or biocompatibility needs (medical use)
 
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MP35N® - LTi Strip and Foil Datasheet
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Orthodontic Brackets