MP35N Cobalt Alloy (ASTM F-562, ISO 5832-6)
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MP35N (UNS R30035, ASTM F562, ISO 5832-6) is a nickel-cobalt-based austenitic alloy with a cobalt content of approximately 35%. ASTM F562 and ISO 5832-6 are both standards for surgical implants.
The most remarkable feature of this material is that, among all alloys currently available on the market capable of achieving a strength of 300 ksi through cold working, it offers the absolute best corrosion resistance. Whether you are manufacturing fasteners, springs, or deep-sea connectors-applications that demand high strength, exceptional corrosion resistance, and non-magnetic properties-there is currently no material more suitable than MP35N.
Its typical applications span several high-end sectors:
Medical: Bone screws, intramedullary nails, implantable springs, surgical instruments
Aerospace: Aircraft fasteners (engine nacelles, wing structures), landing gear components
Marine Engineering: Deep-sea sensor cables, ROV connector components
Oil & Gas: Downhole instrumentation, HPHT valve assemblies, fasteners for acidic environments
Core Features
What makes it get "tighter the more you twist it"?
The following three characteristics can provide the answer:
1. Work Hardening - The "Screw-Tightening" Principle of MP35N;
2. Age Hardening - "Locking In" the Tightened Structure;
3. Corrosion Resistance - "Rock-Solid" Stability in Deep-Sea and Sour-Gas Environments.
chemical composition
(UNS R30035)
| Element | Content Range (wt%) |
| Ni | 33.0-37.0 |
| Co | Remaining (approx. 35) |
| Cr | 19.0-21.0 |
| Mo | 9.0-10.5 |
| Ti | ≤1.0 |
| Fe | ≤1.0 |
| C / Mn / Si / P / S | Trace amount |
Mechanical Properties
The properties of MP35N vary significantly depending on the degree of cold deformation and whether it undergoes aging treatment.
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) |
| Annealed | 930-1000 | 414-450 | 60-70 | ~20 |
| Cold Worked (45%) | ~1570 | ~1303 | 17 | ~47 |
| Cold Worked (55%) | ~1827 | ~1413 | 12 | ~47 |
| Cold Worked (65%) | ~1931 | ~1620 | 11 | ~50 |
| Cold Worked (53%) + Aged | 2068 (300ksi) | 1999 (290ksi) | 10 | ~50 |
Processing Difficulty
The machinability of MP35N differs significantly from that of traditional precipitation-hardening alloys (such as Alloy 718):
1. Machining - Difficult, but manageable with the right techniques (specifically: utilize rigid machine tools and sharp cutting tools; employ a strategy of low speeds and high feed rates to avoid "rubbing" the surface; and use an ample supply of coolant).
2. Welding - Weldable, but requires strict heat input control.
3. Cold Working - Cold working serves as a substitute for heat treatment.
4. Heat Treatment - Annealing followed by aging.
Confirm Product Form and Status
Before providing a quotation, we will discuss the following technical specifications with you:
- Form: Round bar, flat bar, wire, or forging?
- Dimensions: Diameter/Side length, Length
- Condition: Annealed (soft) or Cold-worked/Aged (hard)?
- Surface Finish: Turned, ground, pickled, or polished?
- Heat Treatment Requirements: Is the supplier required to perform cold working and aging treatment prior to shipment?
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