Nickel Alloy CX2MW-SA
Heat-treated state · default condition
UNS N26022, N06022 · ASTM A494 CX2MW
SA = solution annealed and rapidly quenched
Standard supply condition for all corrosion-service castings: solution anneal ≈1120–1180 °C then water quench to dissolve carbides/μ-phase.
Values for the SA condition
Other CX2MW tempers and conditions
CX2MW is listed in 4 conditions; see the grade overview at CX2MW.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Only for non-critical or non-corrosive structural parts: interdendritic carbide/μ-phase network lowers ductility and localized-corrosion resistance. | 330 | 550 | 22 | 18 HRC | 1.5 % IACS |
SADefaultThis page Solution annealed and rapidly quenched | Standard supply condition for all corrosion-service castings: solution anneal ≈1120–1180 °C then water quench to dissolve carbides/μ-phase. | 335 | 620 | 45 | 200 HB | — |
Weld-repaired casting, solution annealed after repair | Typical condition for foundry weld-repaired valve/pump bodies; matching ERNiCrMo-10 filler plus post-repair solution anneal restores base-metal properties. | 335 | 600 | 38 | 205 HB | 1.5 % IACS |
hot isostatically pressed then solution annealed | Choose for thick-wall pressure parts or investment castings needing closed porosity, best ductility/toughness and radiographic soundness. | 345 | 645 | 50 | 200 HB | 1.5 % IACS |
What is CX2MW-SA?
CX2MW-SA is CX2MW heat treated to SA — standard supply condition for all corrosion-service castings: solution anneal ≈1120–1180 °C then water quench to dissolve carbides/μ-phase. CX2MW-SA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 65% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi). CX2MW-SA has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 72% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Advantages
- Good corrosion resistance — 92/100, better than 91% of nickel alloy grades
CX2MW-SA properties
Typical room-temperature values for CX2MW-SA; 11 are specific to this condition. Other listed values are CX2MW reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
CX2MW-SA has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 72% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Mechanical13
CX2MW-SA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 65% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CX2MW-SA is rated for continuous service to 675°C (1,247 °F). It conducts heat at 10.1 W/m·K (5.84 BTU/hr·ft·°F), worse than 84% of nickel alloy grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
CX2MW-SA conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of nickel alloy grades.
Sustainability4
Producing a kilogram of CX2MW-SA takes about 145 MJ of energy and emits 12.5 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
CX2MW-SA's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CX2MW-SA
Is CX2MW easy to machine?
Low speed, heavy positive-rake carbide or ceramic tooling, rigid setups and flood coolant; the alloy work-hardens fast so avoid dwell and keep a constant, generous feed.
Can CX2MW be welded?
Readily GTAW/GMAW welded with matching ERNiCrMo-10 (AWS A5.14) filler, low heat input, no preheat and interpass <150 °C; solution anneal after major weld repair for best corrosion performance.
Can CX2MW be formed, bent or molded?
Sand or investment cast with tight Si/C control and generous risering; the alloy is hot-tear and shrinkage sensitive, and every casting needs 1120–1180 °C solution anneal with rapid quench.
What surface finishes work on CX2MW?
Grind/blast to remove oxidized cast skin, then pickle-passivate or electropolish; not anodizable, and no plating is normally required since the alloy is inherently passive.
CX2MW 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 |
|---|---|---|
| Cextra-low carbon for as-welded corrosion resistance | ≤ 0.02 | 0.01 |
| Mn | ≤ 1 | 0.5 |
| Sitight Si limit vs. older cast C alloys | ≤ 0.08 | 0.05 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 20 – 22.5 | 21 |
| Mo | 12.5 – 14.5 | 13.5 |
| W | 2.5 – 3.5 | 3 |
| Fe | 2 – 6 | 4 |
| Co | ≤ 2.5 | 1 |
| V | ≤ 0.35 | 0.1 |
| Nibalance, typically 54–58 % | balance | — |
CX2MW-SA — frequently asked
What is CX2MW-SA used for?
CX2MW-SA is typically used for scrubber pump housings, waste incineration valves and chemical process piping fittings. In short: cast Hastelloy C-22 equivalent; widest mixed-acid corrosion range; 675 °C service ceiling.
What is the yield strength of CX2MW-SA?
CX2MW-SA has a typical yield strength of 335 MPa (48.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 65% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CX2MW-SA easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Low speed, heavy positive-rake carbide or ceramic tooling, rigid setups and flood coolant; the alloy work-hardens fast so avoid dwell and keep a constant, generous feed.
Can CX2MW-SA be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW welded with matching ERNiCrMo-10 (AWS A5.14) filler, low heat input, no preheat and interpass <150 °C; solution anneal after major weld repair for best corrosion performance.
What surface finishes work on CX2MW-SA?
Grind/blast to remove oxidized cast skin, then pickle-passivate or electropolish; not anodizable, and no plating is normally required since the alloy is inherently passive.
Can CX2MW-SA be formed, bent or molded?
Sand or investment cast with tight Si/C control and generous risering; the alloy is hot-tear and shrinkage sensitive, and every casting needs 1120–1180 °C solution anneal with rapid quench.
What is the maximum service temperature of CX2MW-SA?
CX2MW-SA is rated for continuous use to about 675°C (1,247 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CX2MW-SA and CX2MW-AC?
SA is the default condition — standard supply condition for all corrosion-service castings: solution anneal ≈1120–1180 °C then water quench to dissolve carbides/μ-phase. AC: only for non-critical or non-corrosive structural parts: interdendritic carbide/μ-phase network lowers ductility and localized-corrosion resistance. Yield strength is 335 MPa in SA versus 330 MPa in AC.
Sources
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy (grade CX2MW) — ASTM International (2023)
- HASTELLOY C-22 alloy technical data (H-2019) — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 15 — Casting (nickel-alloy castings) — ASM International (2008)
- AWS A5.14/A5.14M — Nickel and Nickel-Alloy Bare Welding Electrodes and Rods (ERNiCrMo-10) — AWS (2018)
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.