Nickel Alloy CY-40 AS-CAST
Heat-treated state · default condition
UNS N06040, J06040 · ASTM A494 CY40
Standard commercial supply condition for valve bodies and pump casings meeting A494 CY-40 minimums.
Values for the AS-CAST condition
Other CY-40 tempers and conditions
CY-40 is listed in 3 conditions; see the grade overview at CY-40.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Choose when maximum ductility, chemical homogeneity and best corrosion/weld-repair behaviour are needed. | 225 | 505 | 42 | 135 HB | 1.7 % IACS |
AS-CASTDefaultThis page As-Cast (A494 CY-40, as-cast/stress-relieved) | Standard commercial supply condition for valve bodies and pump casings meeting A494 CY-40 minimums. | 245 | 520 | 38 | 145 HB | 1.7 % IACS |
Hot isostatic pressed | Used for pressure-critical or fatigue-loaded castings where internal porosity must be eliminated. | 250 | 545 | 45 | 140 HB | 1.7 % IACS |
What is CY-40 AS-CAST?
CY-40 AS-CAST is CY-40 heat treated to AS-CAST — standard commercial supply condition for valve bodies and pump casings meeting A494 CY-40 minimums. CY-40 AS-CAST has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 88% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 200 GPa (29 Msi). CY-40 AS-CAST has a density of 8.45 g/cm³ (0.305 lb/in³), heavier than 62% of nickel alloy grades. It melts at 1,354°C (2,469 °F).
Advantages
- Conducts heat well — 14.8 W/m·K (8.55 BTU/hr·ft·°F), better than 80% of nickel alloy grades
- High service temperature — 1,000°C (1,832 °F), better than 79% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- Low strength — 245 MPa (35.5 ksi), worse than 88% of nickel alloy grades
- Hard to polish — 60/100, worse than 84% of nickel alloy grades
- Limited formability — 20/100, worse than 75% of nickel alloy grades
CY-40 AS-CAST properties
Typical room-temperature values for CY-40 AS-CAST; 22 are specific to this condition. Other listed values are CY-40 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
CY-40 AS-CAST has a density of 8.45 g/cm³ (0.305 lb/in³), heavier than 62% of nickel alloy grades. It melts at 1,354°C (2,469 °F).
Mechanical16
CY-40 AS-CAST has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 88% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CY-40 AS-CAST is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 14.8 W/m·K (8.55 BTU/hr·ft·°F), better than 80% of nickel alloy grades. Thermal expansion is 13.3 µm/m·K (7.39 µin/in·°F).
Electrical3
CY-40 AS-CAST conducts electricity at 1.7 % IACS, better than 76% 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 CY-40 AS-CAST takes about 150 MJ of energy and emits 12 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 45%.
Manufacturability8
CY-40 AS-CAST's machinability is poor (28/100, better than 82% of nickel alloy grades); weldability good (60/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CY-40 AS-CAST
Is CY-40 easy to machine?
Gummy, strongly work-hardening: use rigid setups, positive-rake carbide or ceramic tooling, 15–35 m/min with heavy feed, flood coolant, and avoid dwelling to prevent glazing.
Can CY-40 be welded?
Weldable with GTAW/SMAW using ERNiCr-3/ENiCrFe-3 fillers; clean to bright metal, keep interpass temperature low and heat input modest — high cast carbon makes it more hot-crack prone than wrought 600.
Can CY-40 be formed, bent or molded?
Supplied only as castings (sand, investment, centrifugal); Si addition aids fluidity but the alloy is hot-tear sensitive, so use generous fillets, controlled riser feeding and slow, uniform cooling.
What surface finishes work on CY-40?
Grit blast and pickle/passivate for a clean oxide-free surface; can be electropolished or mechanically polished (porosity limits mirror finish); not anodizable, electroless Ni or hard chrome used for wear faces.
CY-40 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 |
|---|---|---|
| Cr | 14 – 17 | 15.5 |
| Fe | ≤ 11 | 8 |
| Chigher than wrought alloy 600 | ≤ 0.4 | 0.25 |
| Mn | ≤ 1.5 | 0.8 |
| Siadded for casting fluidity | ≤ 3 | 1.5 |
| Cu | ≤ 0.5 | 0.1 |
| S | ≤ 0.03 | 0.01 |
| P | ≤ 0.03 | 0.01 |
| Ni72 % min per ASTM A494 | ≥ 72 (balance) | — |
CY-40 AS-CAST — frequently asked
What is CY-40 AS-CAST used for?
CY-40 AS-CAST is typically used for high-temperature valve castings, nitric acid service pumps and furnace fixtures. In short: cast Alloy 600; 1000 °C cast nickel; highest-temperature cast grade here.
What is the yield strength of CY-40 AS-CAST?
CY-40 AS-CAST has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 88% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is CY-40 AS-CAST easy to machine?
Not especially — machinability is rated poor (28/100, better than 82% of nickel alloy grades). Gummy, strongly work-hardening: use rigid setups, positive-rake carbide or ceramic tooling, 15–35 m/min with heavy feed, flood coolant, and avoid dwelling to prevent glazing.
Can CY-40 AS-CAST be welded?
Yes — weldability is rated good (60/100). Weldable with GTAW/SMAW using ERNiCr-3/ENiCrFe-3 fillers; clean to bright metal, keep interpass temperature low and heat input modest — high cast carbon makes it more hot-crack prone than wrought 600.
What surface finishes work on CY-40 AS-CAST?
Grit blast and pickle/passivate for a clean oxide-free surface; can be electropolished or mechanically polished (porosity limits mirror finish); not anodizable, electroless Ni or hard chrome used for wear faces.
Can CY-40 AS-CAST be formed, bent or molded?
Supplied only as castings (sand, investment, centrifugal); Si addition aids fluidity but the alloy is hot-tear sensitive, so use generous fillets, controlled riser feeding and slow, uniform cooling.
What is the maximum service temperature of CY-40 AS-CAST?
CY-40 AS-CAST is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CY-40 AS-CAST and CY-40-SA?
AS-CAST is the default condition — standard commercial supply condition for valve bodies and pump casings meeting A494 CY-40 minimums. SA: choose when maximum ductility, chemical homogeneity and best corrosion/weld-repair behaviour are needed. Yield strength is 245 MPa in AS-CAST versus 225 MPa in SA.
Sources
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy — ASTM International (2023)
- INCONEL alloy 600 technical bulletin — Special Metals Corporation (2008)
- 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)
- UNS N06040 / J06040 alloy designation listings — SAE/ASTM Unified Numbering System (2019)
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.