Nickel Alloy M-35-1
UNS N24135, J24135 · ASTM A494 M35-1
M-35-1 (A494, N24135/J24135) is a cast nickel-copper alloy matching wrought Monel 400 (N04400), used for pressure-containing castings in seawater and sulfuric acid service.
Reference datasheet — M-35-1 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 F condition
M-35-1 tempers and conditions
M-35-1 is supplied in 3 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Used when maximum ductility, uniform structure and lowest hardness are required, e.g. for castings to be machined heavily or subsequently welded. | 185 | 470 | 40 | 115 HB | 3.5 % IACS |
Stress relieved | Pick when weld repairs or heavy sections leave residual stress that could cause distortion or stress-corrosion in HF/steam service. | 195 | 480 | 37 | 120 HB | 3.4 % IACS |
FDefault As fabricated | Standard commercial condition for A494 M35-1 pump casings, valve bodies and impellers. | 205 | 485 | 35 | 125 HB | — |
What is M-35-1?
M-35-1 (A494, N24135/J24135) is a cast nickel-copper alloy matching wrought Monel 400 (N04400), used for pressure-containing castings in seawater and sulfuric acid service. Typical properties are 205 MPa yield, 485 MPa tensile, 35 % elongation and 125 HB (70 HRB), with a corrosion rating of 76 and service to 480 °C. The alloy cuts gummy and work-hardens, and it shrinks strongly on solidification, so risers, chills and Mg or Ti deoxidation are needed to avoid gas porosity. CZ-100 is the alternative where pure nickel is wanted for caustic duty; CY-40 covers higher temperatures. M-35-1 has a density of 8.84 g/cm³ (0.319 lb/in³), heavier than 83% of nickel alloy grades. It melts at 1,300°C (2,372 °F). M-35-1 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 94% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 150 GPa (21.8 Msi).
What is M-35-1 used for?
- Seawater pump casings
- Valve bodies
- Marine hardware castings
Advantages
- Conducts heat well — 22 W/m·K (12.7 BTU/hr·ft·°F), better than 91% of nickel alloy grades
- High electrical conductivity — 3.4 % IACS, better than 90% of nickel alloy grades
- Easy to machine — 30/100, better than 90% of nickel alloy grades
- Low embodied carbon — 9.5 kg CO₂/kg, better than 90% of nickel alloy grades
Limitations
- Low stiffness — 150 GPa (21.8 Msi), worse than 95% of nickel alloy grades
- Low strength — 205 MPa (29.7 ksi), worse than 94% of nickel alloy grades
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
M-35-1 properties
Typical room-temperature values for M-35-1-F; bars are the position among nickel alloy grades.
Physical3
M-35-1 has a density of 8.84 g/cm³ (0.319 lb/in³), heavier than 83% of nickel alloy grades. It melts at 1,300°C (2,372 °F).
Mechanical13
M-35-1 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 94% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal6
M-35-1 is rated for continuous service to 480°C (896 °F). It conducts heat at 22 W/m·K (12.7 BTU/hr·ft·°F), better than 91% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
M-35-1 conducts electricity at 3.4 % IACS, better than 90% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), worse than 59% of nickel alloy grades.
Sustainability4
Producing a kilogram of M-35-1 takes about 125 MJ of energy and emits 9.5 kg of CO₂ — less than 89% of nickel alloy grades. Typical recycled content is 45%.
Manufacturability7
M-35-1's machinability is poor (30/100, better than 90% of nickel alloy grades); weldability very good (72/100).
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. M-35-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with M-35-1
Is M-35-1 easy to machine?
Gummy and work-hardening: use rigid setups, sharp positive-rake carbide, low speed (25–45 m/min) with heavy feed, flood coolant and never dwell in the cut.
Can M-35-1 be welded?
Readily welded with GTAW/SMAW using ERNiCu-7 / ENiCu-7 filler; grind out casting skin and defects, preheat only to remove moisture, keep interpass low and avoid sulfur-bearing contamination.
Can M-35-1 be formed, bent or molded?
Sand or investment cast; alloy is fluid but shrinks strongly — use generous risers, chills on heavy sections and degas/deoxidize with Mg or Ti to avoid gas porosity.
M-35-1 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 |
|---|---|---|
| Cu | 26 – 33 | 30 |
| C | ≤ 0.35 | 0.2 |
| Mn | ≤ 1.5 | 1 |
| Silow-Si limit gives the weldable grade (vs M35-2 at 2.0 % max) | ≤ 1.25 | 1 |
| Fe | ≤ 3.5 | 2 |
| Nbcolumbium, optional weld-soundness addition | ≤ 0.5 | 0.2 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Niremainder, per ASTM A494 M35-1 | ≥ 60 (balance) |
What surface finishes work on M-35-1?
Cannot be anodized; pickle or grit-blast then passivate, or electropolish; takes a good mechanical polish and can be nickel/chrome plated if required.
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 M-35-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N24135J24135N04400
- ASTM
- A494 M35-1
How much does M-35-1 cost?
M-35-1 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.
M-35-1 — frequently asked
What is M-35-1 used for?
M-35-1 is typically used for seawater pump casings, valve bodies and marine hardware castings. In short: cast Monel 400; seawater casting standard; ni-Cu castings for acid.
What is the yield strength of M-35-1?
M-35-1 has a typical yield strength of 205 MPa (29.7 ksi) and a tensile strength of 485 MPa (70.3 ksi) — weaker than 94% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is M-35-1 easy to machine?
Not especially — machinability is rated poor (30/100, better than 90% of nickel alloy grades). Gummy and work-hardening: use rigid setups, sharp positive-rake carbide, low speed (25–45 m/min) with heavy feed, flood coolant and never dwell in the cut.
Can M-35-1 be welded?
Yes — weldability is rated very good (72/100). Readily welded with GTAW/SMAW using ERNiCu-7 / ENiCu-7 filler; grind out casting skin and defects, preheat only to remove moisture, keep interpass low and avoid sulfur-bearing contamination.
What surface finishes work on M-35-1?
Cannot be anodized; pickle or grit-blast then passivate, or electropolish; takes a good mechanical polish and can be nickel/chrome plated if required.
Can M-35-1 be formed, bent or molded?
Sand or investment cast; alloy is fluid but shrinks strongly — use generous risers, chills on heavy sections and degas/deoxidize with Mg or Ti to avoid gas porosity.
What is the maximum service temperature of M-35-1?
M-35-1 is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between M-35-1-F and M-35-1-ANN?
F is the default condition — standard commercial condition for A494 M35-1 pump casings, valve bodies and impellers. ANN: used when maximum ductility, uniform structure and lowest hardness are required, e.g. for castings to be machined heavily or subsequently welded. Yield strength is 205 MPa in F versus 185 MPa in ANN.
How much does M-35-1 cost?
M-35-1 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
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy — ASTM International (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt and Their Alloys — ASM International (2000)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Nickel-Copper Alloy 400 / cast equivalent datasheets — Special Metals / foundry publications (2021)
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.