Nickel Alloy CW2M
UNS J26455, N06200 · ASTM A494 CW2M
CW2M (J26455, ASTM A494) is the cast form of Alloy C-2000, a low-carbon Ni-Cr-Mo alloy with a copper addition that resists both oxidising and reducing acids, including sulfuric and hydrochloric.
Reference datasheet — CW2M 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 SA condition
CW2M tempers and conditions
CW2M is supplied in 3 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
Spheroidize annealed | Rarely accepted for corrosion duty - interdendritic carbide/mu-phase network lowers ductility and localised-corrosion resistance; used only for non-wetted or trial parts. | 285 | 480 | 22 | 14 HRC | 1.4 % IACS |
SADefault Solution annealed and rapidly quenched | Standard delivery condition for all ASTM A494 CW-2M castings; maximum corrosion resistance and ductility. | 300 | 540 | 45 | 190 HB | — |
Hot isostatically pressed then solution annealed | Choose for pressure-containing or fatigue-loaded castings where residual microporosity must be closed (pump casings, valve bodies for severe service). | 305 | 555 | 50 | 190 HB | 1.4 % IACS |
Supply forms, finishes and certifications
Ways CW2M is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WR | Weld-repaired and re-solution annealed | Surface finish |
What is CW2M?
CW2M (J26455, ASTM A494) is the cast form of Alloy C-2000, a low-carbon Ni-Cr-Mo alloy with a copper addition that resists both oxidising and reducing acids, including sulfuric and hydrochloric. Solution-annealed castings reach 300 MPa yield, 540 MPa tensile, 45 % elongation and 190 HB (88 HRB), with a corrosion resistance score of 92 and service to 650 °C, and are poured as sand or investment castings. It is expensive and slow to machine because it work-hardens, and heavily repaired castings need re-solution annealing. CW6M covers similar duty where chloride pitting dominates. CW2M has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,325°C (2,417 °F). CW2M has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 202 GPa (29.3 Msi).
What is CW2M used for?
- pump casings for mixed acid service
- valve trim
- flue gas desulfurization components
Advantages
- Good corrosion resistance — 92/100, better than 91% of nickel alloy grades
Limitations
- Low strength — 300 MPa (43.5 ksi), worse than 78% of nickel alloy grades
CW2M properties
Typical room-temperature values for CW2M-SA; bars are the position among nickel alloy grades.
Physical3
CW2M has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,325°C (2,417 °F).
Mechanical13
CW2M has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 202 GPa (29.3 Msi).
Thermal5
CW2M is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), worse than 88% of nickel alloy grades. Thermal expansion is 11.2 µm/m·K (6.22 µin/in·°F).
Electrical3
CW2M conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of nickel alloy grades.
Sustainability4
Producing a kilogram of CW2M takes about 175 MJ of energy and emits 14 kg of CO₂ — more than 65% of nickel alloy grades. Typical recycled content is 45%.
Manufacturability8
CW2M's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability very good (75/100); formability poor (25/100).
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. CW2M is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CW2M
Is CW2M easy to machine?
Tough, gummy and strongly work-hardening: use rigid setups, positive-rake carbide or ceramic tooling, low speed with heavy positive feed, flood coolant and never dwell in the cut.
Can CW2M be welded?
Readily GTAW/GMAW welded with matching low-carbon Ni-Cr-Mo filler (ERNiCrMo type); keep interpass temperature low, use low heat input and no preheat; re-solution anneal heavily repaired castings.
Can CW2M be formed, bent or molded?
Supplied as sand or investment castings - design generous fillets and directional solidification with chills/risers to avoid hot tears and interdendritic shrinkage; solution treat and water quench after pouring.
CW2M 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 | 15 – 17.5 | 16 |
| Mo | 15 – 17.5 | 16 |
| Fe | ≤ 2 | 1 |
| W | ≤ 1 | 0.3 |
| Clow carbon for as-welded/as-cast corrosion resistance | ≤ 0.02 | 0.01 |
| Si | ≤ 0.8 | 0.5 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Ni | balance |
What surface finishes work on CW2M?
Grit blast and pickle/passivate wetted surfaces to remove casting scale and any iron contamination; mechanical polishing improves corrosion behaviour; no anodizing or plating 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 CW2M in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J26455N06200
- ASTM
- A494 CW2M
How much does CW2M cost?
CW2M 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.
CW2M — frequently asked
What is CW2M used for?
CW2M is typically used for pump casings for mixed acid service, valve trim and flue gas desulfurization components. In short: cast Alloy C-2000; widest acid range cast grade; oxidising and reducing service.
What is the yield strength of CW2M?
CW2M has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is CW2M easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Tough, gummy and strongly work-hardening: use rigid setups, positive-rake carbide or ceramic tooling, low speed with heavy positive feed, flood coolant and never dwell in the cut.
Can CW2M be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW welded with matching low-carbon Ni-Cr-Mo filler (ERNiCrMo type); keep interpass temperature low, use low heat input and no preheat; re-solution anneal heavily repaired castings.
What surface finishes work on CW2M?
Grit blast and pickle/passivate wetted surfaces to remove casting scale and any iron contamination; mechanical polishing improves corrosion behaviour; no anodizing or plating required.
Can CW2M be formed, bent or molded?
Supplied as sand or investment castings - design generous fillets and directional solidification with chills/risers to avoid hot tears and interdendritic shrinkage; solution treat and water quench after pouring.
What is the maximum service temperature of CW2M?
CW2M is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CW2M-SA and CW2M-AC?
SA is the default condition — standard delivery condition for all ASTM A494 CW-2M castings; maximum corrosion resistance and ductility. AC: rarely accepted for corrosion duty - interdendritic carbide/mu-phase network lowers ductility and localised-corrosion resistance; used only for non-wetted or trial parts. Yield strength is 300 MPa in SA versus 285 MPa in AC.
How much does CW2M cost?
CW2M 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 and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt and Their Alloys — ASM International (2000)
- Ni-Cr-Mo corrosion-resistant alloy technical data (C-type alloys) — Alloy producers/foundries (2022)
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.