Nickel Alloy MP35N
UNS R30035 · EN 2.4999
MP35N (UNS R30035) is a cobalt-nickel-chromium-molybdenum multiphase alloy strengthened by cold work plus aging, combining extremely high strength with excellent corrosion resistance.
Reference datasheet — MP35N is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CW-AGED-260 condition
MP35N tempers and conditions
MP35N is supplied in 7 conditions, soft to hard. CW-AGED-260 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for deep drawing, wire redrawing, machining of complex parts and for weld fabrication before final strengthening. | 415 | 950 | 65 | 210 HB | — |
Hot Worked + Aged | Used when the section is too large to cold work; gives moderate aged strength with good toughness in forgings and thick bar. | 830 | 1,240 | 25 | 36 HRC | 1.7 % IACS |
Cold Worked ~20 % | Intermediate strength with retained ductility for formed springs, tubing and medical wire that must still be bent or coiled. | 900 | 1,240 | 35 | 34 HRC | 1.7 % IACS |
Cold Worked ~50 % | High-strength unaged condition for fine wire, cables and springs where aging distortion is unacceptable. | 1,590 | 1,720 | 12 | 46 HRC | — |
CW-AGED-260Default Cold Worked + Aged, 260 ksi class | Standard aerospace fastener and downhole bar condition — 1793 MPa minimum UTS with good ductility and full corrosion resistance. | 1,790 | 1,930 | 10 | 50 HRC | — |
Cold Worked + Aged, 285 ksi class | Higher cold-work level for small-diameter fasteners and springs needing ~1965 MPa minimum tensile with reduced ductility. | 1,930 | 2,030 | 8 | 53 HRC | 1.7 % IACS |
Cold Worked + Aged, 300 ksi class | Maximum-strength condition obtainable only in wire and small-diameter bar; choose for the highest fastener preload or spring stress. | 2,000 | 2,100 | 6 | 55 HRC | 1.7 % IACS |
What is MP35N?
MP35N (UNS R30035) is a cobalt-nickel-chromium-molybdenum multiphase alloy strengthened by cold work plus aging, combining extremely high strength with excellent corrosion resistance. It is bought as bar, wire and strip for aerospace fasteners, springs and implantable devices. In the cold-worked and aged condition it reaches 1790 MPa yield, 1930 MPa tensile, 10 % elongation and 50 HRC, with service to about 425 °C. Machinability (12), weldability (25) and formability (10) are all poor and cost is high; Alloy 718 is the usual lower-cost substitute where the corrosion requirement allows. MP35N has a density of 8.43 g/cm³ (0.305 lb/in³), heavier than 59% of nickel alloy grades. It melts at 1,315°C (2,399 °F). MP35N has a yield strength of 1,790 MPa (260 ksi) and a tensile strength of 1,930 MPa (280 ksi) — stronger than 100% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 233 GPa (33.8 Msi).
What is MP35N used for?
- aerospace fasteners
- high-strength springs
- surgical implants
- cardiovascular stents
- wire rope/cable
Advantages
- High strength — 1,790 MPa (260 ksi), better than 100% of nickel alloy grades
- Stiff — 233 GPa (33.8 Msi), better than 100% of nickel alloy grades
- Polishes to a fine finish — 88/100, better than 100% of nickel alloy grades
- Good corrosion resistance — 92/100, better than 91% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- High embodied carbon — 16 kg CO₂/kg, worse than 93% of nickel alloy grades
- Limited service temperature — 425°C (797 °F), worse than 90% of nickel alloy grades
- Limited ductility — 10%, worse than 85% of nickel alloy grades
- Limited formability — 10/100, worse than 85% of nickel alloy grades
- Difficult to weld — 25/100, worse than 82% of nickel alloy grades
MP35N properties
Typical room-temperature values for MP35N-CW-AGED-260; bars are the position among nickel alloy grades.
Physical3
MP35N has a density of 8.43 g/cm³ (0.305 lb/in³), heavier than 59% of nickel alloy grades. It melts at 1,315°C (2,399 °F).
Mechanical16
MP35N has a yield strength of 1,790 MPa (260 ksi) and a tensile strength of 1,930 MPa (280 ksi) — stronger than 100% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 233 GPa (33.8 Msi).
Thermal5
MP35N is rated for continuous service to 425°C (797 °F). It conducts heat at 11.2 W/m·K (6.47 BTU/hr·ft·°F), worse than 52% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
MP35N conducts electricity at 1.7 % IACS, better than 76% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of nickel alloy grades.
Sustainability4
Producing a kilogram of MP35N takes about 230 MJ of energy and emits 16 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 20%.
Manufacturability8
MP35N's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability poor (25/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. MP35N is highlighted; hover a dot for its name, or open the interactive family chart.
Working with MP35N
Is MP35N easy to machine?
Very difficult — extreme work hardening and low thermal conductivity; use rigid setups, positive-rake carbide or ceramic tooling, heavy positive feed with no dwell, low surface speed and copious high-pressure coolant.
Can MP35N be welded?
GTAW/plasma/EB/laser welding is feasible in the annealed condition with matching filler; welding after cold work and aging destroys the strengthening in the HAZ and is generally avoided.
Can MP35N be formed, bent or molded?
Excellent cold formability when annealed (drawing, coiling, heading with interstage anneals); in the cold-worked + aged condition it is essentially unformable, so all bending must precede aging.
MP35N chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ni | 33 – 37 | 35 |
| Cr | 19 – 21 | 20 |
| Mo | 9 – 10.5 | 10 |
| Fe | ≤ 1 | 0.5 |
| Tiaids age hardening | ≤ 1 | 0.5 |
| Mn | ≤ 0.15 | |
| Si | ≤ 0.15 | |
| C | ≤ 0.03 | |
| P | ≤ 0.02 | |
| S | ≤ 0.01 | |
| B | ≤ 0.02 | |
| Cobalance in most specifications | ≥ 33 (balance) |
What surface finishes work on MP35N?
Not anodizable; finish by electropolishing or passivation for corrosion and implant surfaces, and use dry-film or MoS2 lubricants / silver plating on threaded fasteners to prevent galling.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy MP35N in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R30035
- EN / DIN / Werkstoff-Nr.
- 2.4999
How much does MP35N cost?
MP35N is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
MP35N — frequently asked
What is MP35N used for?
MP35N is typically used for aerospace fasteners, high-strength springs, surgical implants, cardiovascular stents and wire rope/cable. In short: highest-strength implant alloy; cold-work plus age strengthened; poor machinability, high cost.
What is the yield strength of MP35N?
MP35N has a typical yield strength of 1,790 MPa (260 ksi) and a tensile strength of 1,930 MPa (280 ksi) — stronger than 100% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is MP35N easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% of nickel alloy grades). Very difficult — extreme work hardening and low thermal conductivity; use rigid setups, positive-rake carbide or ceramic tooling, heavy positive feed with no dwell, low surface speed and copious high-pressure coolant.
Can MP35N be welded?
Not readily — weldability is rated poor (25/100). GTAW/plasma/EB/laser welding is feasible in the annealed condition with matching filler; welding after cold work and aging destroys the strengthening in the HAZ and is generally avoided.
What surface finishes work on MP35N?
Not anodizable; finish by electropolishing or passivation for corrosion and implant surfaces, and use dry-film or MoS2 lubricants / silver plating on threaded fasteners to prevent galling.
Can MP35N be formed, bent or molded?
Excellent cold formability when annealed (drawing, coiling, heading with interstage anneals); in the cold-worked + aged condition it is essentially unformable, so all bending must precede aging.
What is the maximum service temperature of MP35N?
MP35N is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between MP35N CW-AGED-260 and MP35N-ANN?
CW-AGED-260 is the default condition — standard aerospace fastener and downhole bar condition — 1793 MPa minimum UTS with good ductility and full corrosion resistance. ANN: softest condition for deep drawing, wire redrawing, machining of complex parts and for weld fabrication before final strengthening. Yield strength is 1,790 MPa in CW-AGED-260 versus 415 MPa in ANN.
How much does MP35N cost?
MP35N is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AMS 5844 — Alloy Bars, Forgings and Tubing 35Co-35Ni-20Cr-10Mo, Work Strengthened and Aged — SAE International (2018)
- ASTM F562 — Wrought 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy for Surgical Implants — ASTM International (2022)
- ASTM F688 — Wrought Cobalt-35Nickel-20Chromium-10Molybdenum Alloy Plate, Sheet and Foil — ASTM International (2021)
- MP35N Multiphase Alloy technical data — Carpenter Technology / SPS Technologies (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- NACE MR0175 / ISO 15156-3 — Materials for use in H2S-containing environments — NACE/ISO (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.