MP35N,MP35N Plate,UNS R30035

MP35N,MP35N Forgings,UNS R30035

MP35N (MP35N Forgings, UNS R30035) - Introduction with Composition, Properties, Applications and Product Forms

MP35N, designated by UNS R30035 and widely recognized for its high-performance forgings, is a nickel-cobalt-chromium-molybdenum superalloy celebrated for its exceptional strength, corrosion resistance, and biocompatibility. This alloy is specifically engineered to maintain its mechanical properties across a broad range of temperatures, making it a critical material in aerospace, medical, and industrial applications where components are exposed to extreme stress, harsh environments, and demanding operational conditions. It is available in a comprehensive range of forms to meet diverse industrial needs, including Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip, and Forging Stock. MP35N Forgings, in particular, are valued for their superior strength, uniform microstructure, and ability to be shaped into complex geometries, making them ideal for high-stress components in aerospace engines and medical implants. Below is a detailed overview of its chemical composition, key properties, practical applications, and available product forms.

Chemical Composition

The precisely balanced chemical composition of MP35N (MP35N Forgings, UNS R30035) is the foundation of its exceptional strength, corrosion resistance, and versatility. The typical 

composition (by weight) is as follows:

Nickel (Ni): 33-37% (the primary element, forming the alloy’s matrix and contributing to corrosion resistance)

Cobalt (Co): 35-39% (enhances strength, especially at elevated temperatures, and improves fatigue resistance)

Chromium (Cr): 19-21% (provides excellent corrosion and oxidation resistance, forming a protective passive layer)

Molybdenum (Mo): 9-10% (strengthens the alloy matrix and enhances resistance to pitting and crevice corrosion)

Iron (Fe): ≤ 1.0% (minimized to preserve corrosion resistance and mechanical properties)

Carbon (C): ≤ 0.02% (kept extremely low to avoid carbide formation, which can reduce corrosion resistance)

Silicon (Si): ≤ 0.15% (aids in deoxidation during manufacturing)

Manganese (Mn): ≤ 0.15% (enhances hot workability)

Phosphorus (P): ≤ 0.015% (strictly limited to prevent grain boundary embrittlement)

Sulfur (S): ≤ 0.01% (minimized to ensure good ductility and corrosion resistance)

This carefully engineered composition, with its blend of nickel, cobalt, chromium, and molybdenum, delivers the alloy’s signature high strength, exceptional corrosion resistance, and biocompatibility—key to its performance in demanding applications.

Key Properties

MP35N (MP35N Forgings, UNS R30035) and its various forms exhibit extraordinary properties that make them indispensable in high-stress and corrosive environments:

Mechanical Properties (cold-worked and aged condition):

Tensile strength: 1900-2100 MPa (275,600-304,600 psi) at room temperature (among the highest for corrosion-resistant alloys)

Yield strength (0.2% offset): 1500-1700 MPa (217,600-246,600 psi) at room temperature

Elongation (in 50 mm): 10-15% (good ductility for forming complex shapes despite high strength)

Reduction of area: 20-30% (excellent toughness, enabling resistance to fracture under stress)

Hardness: 48-52 HRC (Rockwell hardness, reflecting exceptional strength)

High-Temperature Properties:

Continuous service temperature: Up to 650°C (1202°F) (maintains strength and corrosion resistance)

Creep resistance: Good resistance to creep deformation at temperatures up to 450°C (842°F), suitable for moderate high-temperature applications

Thermal stability: Retains mechanical properties after prolonged exposure to elevated temperatures, critical for aerospace components

Corrosion Resistance:

General corrosion: Excellent resistance to seawater, brines, and industrial chemicals, outperforming many stainless steels

Pitting and crevice corrosion: Superior resistance to pitting in chloride environments, making it ideal for marine and offshore applications

Oxidation resistance: Good resistance to oxidation in air at temperatures up to 650°C (1202°F)

Biocompatibility: Non-toxic and resistant to bodily fluids, approved for use in medical implants

Physical Properties:

Density: 8.4-8.6 g/cm³ (0.303-0.310 lb/in³)

Thermal conductivity: 13-15 W/(m·K) at 20°C (68°F)

Coefficient of thermal expansion: 12-14 μm/(m·K) (20-400°C)

Modulus of elasticity: 230-240 GPa (33,400-34,800 ksi) at room temperature

Melting point: 1300-1350°C (2372-2462°F)

Product Forms

MP35N (MP35N Forgings, UNS R30035) is manufactured in a diverse range of forms to accommodate specialized high-strength and corrosion-resistant applications:

Bar: Available as Round bar (diameters from 5 mm to 200 mm) and Flat bar (thickness 3 mm to 100 mm, width 10 mm to 500 mm), ideal for machining into fasteners, shafts, and high-stress components.

Ribbon: Thin, flat strips (thickness 0.05 mm to 1 mm, width 2 mm to 100 mm) used in springs, electrical contacts, and precision instruments.

Wire: MP35N Wire (diameters 0.05 mm to 6 mm) offers exceptional strength and flexibility, suitable for medical sutures, springs, and aerospace cables.

Rods: Solid cylindrical rods (diameters 2 mm to 50 mm) used for manufacturing pins, bolts, and surgical tools.

Tube and Pipe: Hollow forms (outer diameter 3 mm to 100 mm, wall thickness 0.1 mm to 10 mm) for high-pressure fluid handling, such as in offshore oil and gas systems and medical catheters.

Foil: Ultra-thin sheets (thickness 0.001 mm to 0.1 mm) used in flexible seals, battery components, and thin coatings for corrosion protection.

Plate and Sheet: Flat forms (plate: thickness 1 mm to 50 mm; sheet: 0.1 mm to 1 mm) for fabricating structural components, pressure vessels, and medical implants.

Strip: Narrow, flat strips (thickness 0.05 mm to 2 mm, width 2 mm to 50 mm) for precision components such as springs, seal rings, and electrical connectors.

Forging Stock: Billets and ingots for hot forging into complex shapes, such as aerospace engine components, turbine disks, and heavy machinery parts.

Applications

The exceptional strength, corrosion resistance, and biocompatibility of MP35N (MP35N Forgings, UNS R30035) across its various forms make it a critical material in industries requiring high performance under extreme conditions:

Aerospace and Aviation:

Aircraft engines: Forged components, fasteners, and shafts (from forging stock, bar, and rod) withstanding high stress and temperature fluctuations.

Airframe structures: High-strength bolts, cables, and springs (from wire, bar, and strip) resisting corrosion and fatigue in harsh environments.

Space systems: Structural components and fasteners (from forging stock and plate) enduring extreme temperatures and vacuum conditions.

Medical and Biomedical:

Implants: Orthopedic implants (screws, plates, and hip joints) and dental fixtures (from bar, plate, and forging stock) offering biocompatibility and long-term durability.

Surgical tools: Precision instruments and catheters (from wire, tube, and rod) resisting corrosion from sterilization processes.

Medical devices: Springs and components for pacemakers and drug delivery systems (from wire and ribbon) requiring high reliability.

Oil and Gas Industry:

Offshore equipment: Valves, pumps, and fasteners (from bar, tube, and forging stock) resisting corrosion in seawater and harsh downhole environments.

Drilling components: Drill bits, sensors, and pressure vessels (from plate, forging stock, and tube) withstanding high pressure and abrasive fluids.

Marine and Defense:

Marine hardware: Shafts, propellers, and fasteners (from bar, forging stock, and plate) resisting seawater corrosion.

Military systems: Armor components, missile parts, and underwater equipment (from forging stock and plate) offering high strength and corrosion resistance.

Industrial and High-Performance Machinery:

High-pressure systems: Valves, fittings, and pressure vessels (from tube, plate, and forging stock) handling corrosive fluids at extreme pressures.

Precision springs: High-strength springs for industrial machinery and robotics (from wire and ribbon) maintaining performance over millions of cycles.

Specialized Applications by Form:

Forgings: Complex aerospace engine components, turbine disks, and heavy machinery parts requiring high strength.

Wire: Medical sutures, aerospace cables, and precision springs in high-stress applications.

Tube/Pipe: High-pressure fluid transport in oil and gas systems and medical catheters.

Bar/Plate: Structural components, fasteners, and medical implants requiring high strength and corrosion resistance.

In summary, MP35N (MP35N Forgings, UNS R30035) — available in forms from Bar and Wire to Plate and Forging Stock — delivers exceptional strength, corrosion resistance, and biocompatibility. Its diverse product forms enable tailored solutions across aerospace, medical, oil and gas, and defense sectors, establishing it as a critical material in applications requiring high performance under extreme conditions.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1321 gallon liquid totes Special package is available on request.