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Alloy MP35N (Tech Center of Shanghai HY Industry Co., Ltd)
MP35N/MP35N (UNS R30035), as an age-hardening nickel-cobalt-based alloy, has occupied a place in many industrial fields with its excellent performance.
MP35N alloy follows strict standards such as AMS 5844, ISO 5832 and NACE MR0175/ISO 15156-3, ensuring its stability and reliability in extreme environments.
MP35N alloy breaks through the material limit with 2000MPa tensile strength and PREN48 corrosion resistance.
From pacemaker wires to aerospace fasteners, its cold deformation phase transformation strengthening and Cr-Mo passivation film technology support the stability of medical implants for ten years, hydrogen fuel cells against penetration, and deep-sea drilling against sulfur corrosion. The biocompatibility and laser welding precision of the alloy simultaneously achieve zero magnetic interference in quantum computing and deep-sea underwater pressure resistance of luxury watches.
The uniqueness of MP35N alloy lies in its combination of ultra-high strength, toughness, ductility and extraordinary corrosion resistance, which makes it an ideal material for solving complex engineering problems.
MP35N Alloy metallurgical properties:
Multiphase strengthening mechanism: Face-centered cubic (FCC) → hexagonal close-packed (HCP) phase transformation induced by cold deformation (≥50%), with a tensile strength of more than 2000 MPa;
Corrosion resistance optimization: Cr-Mo synergistically forms a passive film, and the chloride stress corrosion (SCC) resistance is better than Inconel 718;
Biocompatibility: ISO 10993 certified, suitable for long-term implantation of medical devices.
As a nickel-based alloy, MP35N has mechanical properties and excellent corrosion resistance. Its main characteristics include:
High strength: MP35N still maintains good mechanical properties at high temperatures and can withstand heavy-load working environments.
Wear resistance: Due to its unique chemical composition, MP35N has excellent wear resistance.
Fatigue resistance: MP35N can work under higher alternating stresses, reducing the risk of component failure.
High temperature resistance: MP35N shows good stability under high temperature conditions and is widely used in aerospace and other fields.
Therefore, MP35N is widely used in medical equipment, aerospace, chemical equipment and nuclear energy and other fields, meeting the strict requirements for high performance of materials.
MP35N alloy composition and microstructure
The chemical composition of MP35N alloy has been carefully formulated to ensure its superior performance. Its main elements include about 20% chromium (Cr), which gives the alloy excellent oxidation and corrosion resistance; 35% nickel (Ni) and cobalt (Co), which not only improve the strength and toughness of the alloy, but also enhance its stability at high temperatures; and 10% molybdenum (Mo), which further enhances the corrosion resistance of the alloy, especially in chloride environments. This specific chemical composition combination forms a unique microstructure through the precipitation of fine intermetallic compound phases during the aging hardening process, thus achieving a perfect balance between strength and toughness.
Weight%
Ni
Co
Cr
Mo
Ti
Fe
Si
Mn
P
B
S
C
MP35N
33
Balance
19
9
1
1
0.15
0.15
0.015
0.01
0.01
0.025
37
21
10.5
Max
Max
Max
Max
Max
Max
Max
Max
Mechanical properties and extreme environmental stability
Cold deformation: cold drawing/cold rolling deformation 50%~70% (grain refinement to ASTM grade 12);
Aging treatment: 480–550℃×4–6h → air cooling (precipitation of Ni₃Mo strengthening phase).
Excellent corrosion resistance
MP35N alloy usually includes nickel, chromium, cobalt and other alloying elements. The advantages of its chemical composition make it have super corrosion resistance in a variety of corrosive environments, especially in environments containing chloride ions.
Nickel: Provides good oxidation resistance and corrosion resistance.
Chromium: Improves the high temperature resistance of the alloy and enhances its corrosion resistance.
Cobalt: Increases the strength and ductility of the alloy to ensure that it can maintain integrity under extreme conditions.
MP35N alloy shows extraordinary tolerance in a variety of corrosive media. In chloride solutions such as hydrogen sulfide and salt water, its corrosion resistance is particularly outstanding, thanks to the synergistic effect of chromium, nickel and molybdenum elements in the alloy. In addition, MP35N also shows excellent resistance to crevice corrosion and stress corrosion cracking in seawater and other harsh environmental conditions, such as deep in oil and gas wells. These characteristics make MP35N an indispensable material in the fields of marine engineering, oil and gas extraction, etc.
Pitting resistance (PREN) PREN=48 (much higher than 25 for 316L) Offshore platform cables
Stress corrosion resistance (SCC) No cracking in 42% MgCl₂ solution (boiling) (1000h) Oil and gas well packers
Biocompatibility Cytotoxicity/sensitization test in accordance with ISO 10993-5/-10 Pacemaker wires
Wide range of applications
It is precisely because of these excellent properties of MP35N alloy that it is widely used in multiple key areas. In the manufacture of fasteners and springs, the high strength and good elastic properties of MP35N enable these parts to maintain stable performance under extreme conditions, such as the fastening systems of aerospace vehicles and spring elements in precision instruments. In the medical field, MP35N is often used to manufacture implantable medical devices such as artificial joints and vascular stents because of its non-magnetic, good biocompatibility and corrosion resistance. In addition, in seawater treatment systems, oil and gas extraction equipment, chemical and food processing machinery, MP35N alloy also plays an irreplaceable role, ensuring the safe operation and long-term stability of the equipment.
Processing and heat treatment
The processing and heat treatment process of MP35N alloy needs to be strictly controlled to ensure that its final performance meets expectations. During the processing process, the high hardness and toughness of the alloy may bring challenges to cutting and forming, so it is crucial to choose the right tools and process parameters. In terms of heat treatment, aging hardening treatment is a key step to improve the performance of MP35N. By precisely controlling the heating temperature, holding time and cooling rate, the precipitation of intermetallic compounds in the alloy can be promoted, thereby optimizing its mechanical properties.
After special heat treatment and surface treatment, MP35N can further enhance its various properties and adapt to more stringent use conditions.
Heat treatment process
Heat treatment plays an important role in improving the performance of alloys. The heat treatment process of MP35N alloy mainly includes solution treatment and aging treatment:
Solution treatment: usually carried out at a temperature of 1020°C to 1060°C, and its strength is increased by quenching.
Aging treatment: After solution treatment, the alloy will be aged at a temperature of 540°C to 600°C to optimize its microstructure and improve fatigue performance and toughness.
Through scientific and reasonable heat treatment process, the mechanical properties and corrosion resistance of MP35N are significantly enhanced, laying a solid foundation for its special application fields.
Welding process and key control points
1. Weldability evaluation (AWS A5.14 standard)
Crack sensitivity: high (strict preheating and post-weld treatment are required);
Recommended process: laser welding, electron beam welding (heat affected zone ≤0.2mm).
2. Welding parameter specifications
Parameters Recommended range Key control points
Welding material brand MP35N Special welding wire Co/Ni ratio matches the base material
Preheating temperature 300–350℃ (thickness＞3mm) Suppress HAZ hydrogen-induced cracking
ISO 5832-6 Orthopedic implants Fatigue life ≥10⁷ cycles (stress amplitude 700 MPa)
How to improve fatigue life
Fatigue life is a key factor affecting the use of materials. The fatigue life of MP35N alloy can be improved in the following ways:
Optimize alloy composition: adjust the composition ratio of the alloy according to the actual application requirements to obtain mechanical properties.
Fine processing: Control the processing accuracy in mechanical processing to avoid fatigue failure due to defects.
Surface treatment: Use shot peening, heat treatment and other methods to improve the strength of the alloy surface and reduce stress concentration.
Reasonable design: In the design stage, reduce sharp corners and holes, improve the integrity of the structure, and avoid local stress concentration.
Through these methods, the service life of MP35N in working condition can be effectively extended, and the maintenance cost and risk of the enterprise can be reduced.
Seawater desalination system Cl⁻ corrosion resistant pump shaft.
Extension analysis of new application scenarios of MP35N alloy
I. New energy field
Hydrogen energy equipment:
Fuel cell bipolar plates: Using their hydrogen embrittlement resistance (NACE MR0175 certification), long-term anti-permeation performance is achieved in hydrogen fuel cells;
Electrolyzer fasteners: Resistant to high temperature alkaline corrosion (40% KOH solution, 80°C), suitable for green hydrogen preparation equipment connection system.
Wind power generation:
Pitch bearing ball: Ultra-high strength (tensile strength ≥ 2000 MPa) and anti-fretting wear performance, extending the life of offshore wind turbine components.
2. Precision manufacturing and emerging technologies
Quantum computing equipment:
Superconducting coil support: Maintain strength (≥ 2100 MPa) at low temperature (-269°C) and no magnetic interference (magnetic permeability μ < 1.005);
Vacuum chamber sealing ring: Resistant to ultra-high vacuum environment (< 10⁻⁸ Pa) and repeated thermal cycles.
3D printed medical implants:
Customized bone repair mesh: Formed by laser selective melting (SLM), with controllable porosity (30–70%), promoting bone tissue regeneration;
Neural electrode array: Micron-level wire (φ < 50μm) processing for brain-computer interface signal transmission.
3. Transportation and high-end equipment
Rail transportation:
High-speed rail pantograph spring: anti-arc ablation (contact network voltage 25kV) and high-frequency vibration fatigue (10⁷ cycles@600 MPa);
Magnetic levitation train suspension electromagnet: non-magnetic properties (magnetic permeability μ<1.01) reduce eddy current losses.
First wall support structure: resistant to neutron irradiation swelling (dose>50 dpa) and helium embrittlement effect;
Liquid metal cooling pipe: resistant to lead-bismuth eutectic alloy (LBE) corrosion (corrosion rate <0.1 mm/yr at 600°C).
Deep earth exploration:
Geothermal well inclinometer housing: resistant to H₂S/CO₂ mixed gas corrosion (partial pressure>10 MPa), adaptable to supercritical geothermal environment;
Shale gas fracturing shrapnel: high toughness (KIC≥120 MPa·m¹/²) to resist hydraulic fracturing impact load.
5. Consumer high-end products
Sports equipment:
Competitive bicycle speed guide wheel: cold-drawn wire (strength ≥ 1900 MPa) to achieve lightweight (15% lighter than titanium alloy);
Golf club shaft: gradient strength design achieved through rotary forging (HRC 55 at the club head → HRC 45 at the grip end).
Luxury goods manufacturing
Diving watch case: seawater corrosion resistance (ASTM B117 salt spray test ≥ 1000h without pitting) and deep-sea pressure resistance (> 1000m);
Jewelry micro-claw buckle: micron-level laser welding accuracy (weld width < 20μm) to ensure the stability of precious metal inlay.
Note: The above extended scenarios are based on the ultra-high strength, corrosion resistance, biocompatibility and processing adaptability of MP35N alloy, combined with the needs of cutting-edge fields such as new energy and quantum technology, and the data refer to ASTM F562, NACE MR0175 and other standards.
alloy MP35N Environmental protection and sustainable development
With the global emphasis on environmental protection and sustainable development, the environmental performance of MP35N alloy has also attracted much attention. The alloy has relatively little pollution to the environment during production and use, and due to its excellent corrosion resistance, it prolongs the service life of equipment and reduces the frequency of replacement, thereby indirectly reducing resource consumption and waste generation. In addition, the recyclability of MP35N alloy also provides strong support for the circular economy.
In summary, MP35N/MP35N (UNS R30035), as an age-hardening nickel-cobalt-based alloy, has shown a wide range of application prospects in multiple industrial fields with its unique performance advantages. With the advancement of science and technology and the continuous improvement of engineering needs, MP35N alloy will surely play its irreplaceable role in more fields and contribute more to the development of human society.
Shanghai HY Industry Co., Ltdhas international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences，China Electronic Materials Industry Association Magnetic Materials Branch. Years of experience in special alloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.
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MP35N alloy usually includes nickel, chromium, cobalt and other alloying elements. The advantages of its chemical composition make it have super corrosion resistance in a variety of corrosive environments, especially in environments containing chloride ions.