Nickel Alloy CY5SnBiM
UNS N24135 · ASTM A494 CY5SnBiM
CY5SnBiM (UNS N24135, ASTM A494 CY5SnBiM) is a cast nickel-copper Monel-type alloy in which tin and bismuth additions form chip-breaking phases, raising machinability to 55 on this library's scale.
Reference datasheet — CY5SnBiM 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
CY5SnBiM tempers and conditions
CY5SnBiM is supplied in 2 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Optional anneal used on thick or intricate castings to relieve casting/machining stresses and homogenize the Sn-rich network before final machining; slightly softer with better ductility. | 185 | 370 | 22 | 120 HB | 3.3 % IACS |
FDefault As fabricated | Standard supply condition for A494 CY5SnBiM sand and investment castings; no heat treatment, meets the specified tensile minima directly. | 200 | 390 | 18 | 130 HB | 3.2 % IACS |
What is CY5SnBiM?
CY5SnBiM (UNS N24135, ASTM A494 CY5SnBiM) is a cast nickel-copper Monel-type alloy in which tin and bismuth additions form chip-breaking phases, raising machinability to 55 on this library's scale. Castings provide 200 MPa yield, 390 MPa tensile, 18 % elongation and 130 HB with service to 425 °C, and are specified for propellers, impellers and seawater valve bodies that need extensive machining after casting. Bismuth makes weld repair crack-sensitive and the alloy is not hot or cold worked; M35-1 is the alternative when weldability outweighs machining. CY5SnBiM has a density of 8.75 g/cm³ (0.316 lb/in³), heavier than 79% of nickel alloy grades. It melts at 1,290°C (2,354 °F). CY5SnBiM has a yield strength of 200 MPa (29 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 95% of nickel alloy grades. Elongation at break is 18% and the elastic modulus is 150 GPa (21.8 Msi).
What is CY5SnBiM used for?
- ship propellers
- marine pump impellers
- seawater valve bodies
Advantages
- Easy to machine — 55/100, better than 100% of nickel alloy grades
- High electrical conductivity — 3.2 % IACS, better than 89% of nickel alloy grades
- Conducts heat well — 21 W/m·K (12.1 BTU/hr·ft·°F), better than 88% of nickel alloy grades
- Low embodied carbon — 11 kg CO₂/kg, better than 85% of nickel alloy grades
Limitations
- Low strength — 200 MPa (29 ksi), worse than 95% of nickel alloy grades
- Low stiffness — 150 GPa (21.8 Msi), worse than 95% of nickel alloy grades
- Limited service temperature — 425°C (797 °F), worse than 90% 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
CY5SnBiM properties
Typical room-temperature values for CY5SnBiM-F; bars are the position among nickel alloy grades.
Physical3
CY5SnBiM has a density of 8.75 g/cm³ (0.316 lb/in³), heavier than 79% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical14
CY5SnBiM has a yield strength of 200 MPa (29 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 95% of nickel alloy grades. Elongation at break is 18% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal6
CY5SnBiM is rated for continuous service to 425°C (797 °F). It conducts heat at 21 W/m·K (12.1 BTU/hr·ft·°F), better than 88% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
CY5SnBiM conducts electricity at 3.2 % IACS, better than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 61% of nickel alloy grades.
Sustainability4
Producing a kilogram of CY5SnBiM takes about 110 MJ of energy and emits 11 kg of CO₂ — less than 93% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
CY5SnBiM's machinability is good (55/100, better than 100% 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. CY5SnBiM is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CY5SnBiM
Is CY5SnBiM easy to machine?
The Sn/Bi phases break chips, so it turns and drills far more freely than M35-1 — use sharp positive-rake carbide, moderate speeds (~40–70 m/min) and heavy feeds to avoid work hardening.
Can CY5SnBiM be welded?
Weld repair is difficult and usually restricted: bismuth promotes hot cracking; if unavoidable, use low-heat-input GTAW with Ni-Cu (ERNiCu-7) filler after full excavation and preheat control.
Can CY5SnBiM be formed, bent or molded?
Sand or investment cast only; use generous gating/risering and controlled solidification to avoid Sn/Bi segregation and shrinkage porosity — the alloy is not hot- or cold-worked.
CY5SnBiM 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 | 27 – 33 | 30 |
| Snmachinability addition; verify range against current ASTM A494 edition | 3.5 – 4.5 | 4 |
| Bilead-free chip-breaking addition; verify range against current ASTM A494 edition | 1 – 2 | 1.5 |
| C | ≤ 0.05 | 0.03 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1.25 | 0.8 |
| Fe | ≤ 2.5 | 1.2 |
| S | ≤ 0.02 | 0.01 |
| P | ≤ 0.03 | 0.01 |
| Niremainder, Ni + Co | ≥ 60 (balance) |
What surface finishes work on CY5SnBiM?
Machined surfaces polish well and can be electroless-nickel or chrome plated; no anodizing — passivation or simple pickling is used before seawater service.
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 CY5SnBiM in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N24135
- ASTM
- A494 CY5SnBiM
How much does CY5SnBiM cost?
CY5SnBiM 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.
CY5SnBiM — frequently asked
What is CY5SnBiM used for?
CY5SnBiM is typically used for ship propellers, marine pump impellers and seawater valve bodies. In short: free-machining cast Monel; seawater-resistant Ni-Cu casting; poor weld repairability.
What is the yield strength of CY5SnBiM?
CY5SnBiM has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 95% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is CY5SnBiM easy to machine?
Reasonably — machinability is rated good (55/100, better than 100% of nickel alloy grades). The Sn/Bi phases break chips, so it turns and drills far more freely than M35-1 — use sharp positive-rake carbide, moderate speeds (~40–70 m/min) and heavy feeds to avoid work hardening.
Can CY5SnBiM be welded?
Not readily — weldability is rated poor (25/100). Weld repair is difficult and usually restricted: bismuth promotes hot cracking; if unavoidable, use low-heat-input GTAW with Ni-Cu (ERNiCu-7) filler after full excavation and preheat control.
What surface finishes work on CY5SnBiM?
Machined surfaces polish well and can be electroless-nickel or chrome plated; no anodizing — passivation or simple pickling is used before seawater service.
Can CY5SnBiM be formed, bent or molded?
Sand or investment cast only; use generous gating/risering and controlled solidification to avoid Sn/Bi segregation and shrinkage porosity — the alloy is not hot- or cold-worked.
What is the maximum service temperature of CY5SnBiM?
CY5SnBiM 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 CY5SnBiM-F and CY5SnBiM-SR?
F is the default condition — standard supply condition for A494 CY5SnBiM sand and investment castings; no heat treatment, meets the specified tensile minima directly. SR: optional anneal used on thick or intricate castings to relieve casting/machining stresses and homogenize the Sn-rich network before final machining; slightly softer with better ductility. Yield strength is 200 MPa in F versus 185 MPa in SR.
How much does CY5SnBiM cost?
CY5SnBiM 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)
- SAE/ASTM Unified Numbering System (UNS N24135) — SAE International / ASTM (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys — ASM International (2000)
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.