Nickel Alloy MP35N HW-AGED
Heat-treated state
UNS R30035 · EN 2.4999
HW-AGED = 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.
Values for the HW-AGED condition
Other MP35N tempers and conditions
MP35N is listed in 7 conditions; see the grade overview at MP35N.
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 | — |
HW-AGEDThis page 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 HW-AGED?
MP35N HW-AGED is MP35N heat treated to HW-AGED — used when the section is too large to cold work; gives moderate aged strength with good toughness in forgings and thick bar. MP35N HW-AGED has a yield strength of 830 MPa (120 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 88% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 230 GPa (33.4 Msi). MP35N HW-AGED 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). CW-AGED-260 is the default condition FabDigit quotes; HW-AGED is available on request or by drawing note.
Advantages
- Stiff — 230 GPa (33.4 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 strength — 830 MPa (120 ksi), better than 88% 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
- Difficult to weld — 35/100, worse than 76% of nickel alloy grades
- Limited formability — 20/100, worse than 75% of nickel alloy grades
MP35N HW-AGED properties
Typical room-temperature values for MP35N HW-AGED; 22 are specific to this condition. Other listed values are MP35N reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
MP35N HW-AGED 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 HW-AGED has a yield strength of 830 MPa (120 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 88% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 230 GPa (33.4 Msi).
Thermal5
MP35N HW-AGED is rated for continuous service to 425°C (797 °F). It conducts heat at 11.3 W/m·K (6.53 BTU/hr·ft·°F), better than 50% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
MP35N HW-AGED 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 HW-AGED 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 HW-AGED's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability fair (35/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with MP35N HW-AGED
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.
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.
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) | — |
MP35N HW-AGED — frequently asked
What is MP35N HW-AGED used for?
MP35N HW-AGED 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 HW-AGED?
MP35N HW-AGED has a typical yield strength of 830 MPa (120 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 88% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is MP35N HW-AGED easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% 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 HW-AGED be welded?
With care — weldability is rated fair (35/100). 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 HW-AGED?
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 HW-AGED 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 HW-AGED?
MP35N HW-AGED 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.