MP35N （UNS R30035）

MP35N is a high-strength, high-corrosion-resistant cobalt-based alloy, widely used in aerospace, medical, oil and gas, and other industries where extreme performance is required. Its key characteristics include excellent tensile strength, resistance to corrosion, and biocompatibility.

1. Chemical Composition

The typical chemical composition of MP35N alloy is as follows:

• Cobalt (Co): 35%
• Nickel (Ni): 35%
• Chromium (Cr): 20%
• Molybdenum (Mo): 10%
• Carbon (C): ≤0.05%
• Iron (Fe): ≤1%
• Silicon (Si): ≤0.25%

This composition gives MP35N alloy excellent corrosion resistance, high-temperature performance, and remarkable mechanical strength.

2. Key Properties

• High Strength: MP35N alloy has extremely high tensile strength, typically reaching over 1400 MPa, making it suitable for structural components in demanding applications.
• Corrosion Resistance: It is highly resistant to corrosion and can withstand harsh environments such as strong acids, chlorides, and seawater for extended periods.
• Wear Resistance: MP35N offers excellent wear resistance, making it suitable for high-friction environments.
• Biocompatibility: Due to its excellent corrosion resistance, MP35N is commonly used in medical applications, particularly for implants and stents.

3. Mechanical Properties

MP35N alloy's mechanical properties make it ideal for applications that require high strength, corrosion resistance, and wear resistance:

• Tensile Strength: ≥1400 MPa
• Yield Strength: ≥1150 MPa
• Elongation: ≥10%
• Hardness: 42-46 HRC (Rockwell Hardness)

This combination allows MP35N to perform well under extreme loads and maintain its structural integrity.

4. Primary Applications

Due to its exceptional properties, MP35N is used in the following industries:

• Aerospace: Engine components, pneumatic control devices, high-strength fasteners, etc.
• Medical Industry: Implants, stents, dental devices, and other biocompatible medical instruments.
• Oil & Gas: Critical components for offshore platforms, oil drilling equipment, and devices exposed to seawater and acidic environments.
• Electronics: High-performance electronic connectors and components.
• High-Strength Tools: Cutting tools, molds, and dies that require high strength and wear resistance.

5. Weldability and Machinability

• Weldability: MP35N alloy exhibits good weldability and is suitable for conventional welding methods, such as TIG (tungsten inert gas) welding and laser welding.
• Machinability: Despite its high strength and hardness, MP35N can be machined into complex shapes, though the use of carbide tools is necessary for effective machining.

6. Standards and Specifications

• UNS Designation: R30035
• Standards: MP35N is governed by standards set by the manufacturer, and it can be found in ASTM B574, ASTM F1537, and other related specifications.

7. Additional Features

• High-Temperature Oxidation Resistance: MP35N maintains excellent oxidation resistance at elevated temperatures, making it suitable for high-temperature applications.
• Hydrogen Embrittlement Resistance: MP35N has superior resistance to hydrogen embrittlement compared to many other high-strength alloys.

Summary

MP35N is a high-performance alloy made from cobalt, nickel, chromium, and molybdenum, offering outstanding tensile strength, corrosion resistance, wear resistance, and biocompatibility. Its unique properties make it ideal for use in critical applications in aerospace, medical, oil and gas, and high-performance tools. Whether in harsh environments or demanding structural components, MP35N excels in performance and reliability.