Nickel Alloy CW-12MW
UNS N30002, J30002 · ASTM A494 CW12MW
CW-12MW (A494, N30002/J30002) is a cast Ni-Mo-Cr-W alloy corresponding to wrought Hastelloy C (N10002), used for pump and valve castings exposed to both reducing and oxidizing acid mixtures.
Reference datasheet — CW-12MW 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
CW-12MW tempers and conditions
CW-12MW is supplied in 4 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Only for non-critical, low-corrosivity duty or parts to be heat treated later; interdendritic carbides reduce ductility and intergranular corrosion resistance. | 340 | 500 | 4 | 18 HRC | 1.4 % IACS |
As-welded deposit | Condition of weld-repaired areas before re-solution annealing; acceptable for mild service but sensitised HAZ limits acid duty. | 345 | 520 | 6 | 17 HRC | 1.4 % IACS |
SADefault Solution annealed | Standard supply condition for A494 CW-12MW corrosion castings — carbides dissolved, maximum corrosion resistance and ductility. | 350 | 550 | 10 | 15 HRC | — |
hot isostatically pressed then solution annealed | For pressure-boundary or high-integrity castings where internal microporosity must be closed; slightly higher ductility and fatigue life. | 360 | 575 | 15 | 15 HRC | 1.3 % IACS |
What is CW-12MW?
CW-12MW (A494, N30002/J30002) is a cast Ni-Mo-Cr-W alloy corresponding to wrought Hastelloy C (N10002), used for pump and valve castings exposed to both reducing and oxidizing acid mixtures. It gives 350 MPa yield, 550 MPa tensile and 200 HB (15 HRC), with a corrosion rating of 86 — the highest in this cast group — and service to 650 °C. Elongation is only 10 %, machinability is poor (score 22) and solidification shrinkage is about 2.2 %, so heavy risering plus solution annealing after casting or major weld repair are essential. Lower-carbon cast Ni-Cr-Mo grades are preferred where as-welded corrosion resistance must be retained. CW-12MW has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 92% of nickel alloy grades. It melts at 1,275°C (2,327 °F). CW-12MW has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi).
What is CW-12MW used for?
- Chemical process pumps
- Acid valve bodies
- Flue gas equipment castings
Limitations
- Limited ductility — 10%, worse than 85% of nickel alloy grades
- Limited formability — 15/100, worse than 81% of nickel alloy grades
CW-12MW properties
Typical room-temperature values for CW-12MW-SA; bars are the position among nickel alloy grades.
Physical3
CW-12MW has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 92% of nickel alloy grades. It melts at 1,275°C (2,327 °F).
Mechanical14
CW-12MW has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
CW-12MW is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10.2 W/m·K (5.89 BTU/hr·ft·°F), worse than 79% of nickel alloy grades. Thermal expansion is 11.3 µm/m·K (6.28 µin/in·°F).
Electrical3
CW-12MW conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of CW-12MW takes about 150 MJ of energy and emits 12.5 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
CW-12MW's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability good (55/100); formability poor (15/100).
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. CW-12MW is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CW-12MW
Is CW-12MW easy to machine?
Very gummy and work-hardening — use rigid setups, positive-rake carbide or ceramic inserts, low speed (15–25 m/min carbide), heavy positive feed, flood coolant, and never dwell in the cut.
Can CW-12MW be welded?
GTAW/SMAW with matching ERNiCrMo-5 (or ENiCrMo-5) filler, low heat input, no preheat, interpass < 100 °C; re-solution anneal and quench after major weld repair to restore corrosion resistance.
Can CW-12MW be formed, bent or molded?
Casting grade only — sand or investment cast with generous risering (wide freezing range, high shrinkage ~2.2 %); solution anneal after shakeout, machine allowances should account for hard skin.
CW-12MW 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 |
|---|---|---|
| Chigher than wrought C-276 | ≤ 0.12 | 0.08 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 1 | 0.7 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 15.5 – 17.5 | 16.5 |
| Mo | 16 – 18 | 17 |
| W | 3.75 – 5.25 | 4.5 |
| Fe | 4.5 – 7.5 | 6 |
| V | 0.2 – 0.4 | 0.3 |
| Nibalance, nominally ~54 % | balance |
What surface finishes work on CW-12MW?
Grit blast, pickle in HNO3–HF then passivate; electropolish or mechanically polish sealing faces; no anodising — apply no coating in acid service so the natural passive film works.
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 CW-12MW in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N30002J30002N10002
- ASTM
- A494 CW12MW
How much does CW-12MW cost?
CW-12MW 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.
CW-12MW — frequently asked
What is CW-12MW used for?
CW-12MW is typically used for chemical process pumps, acid valve bodies and flue gas equipment castings. In short: cast Hastelloy C; best cast corrosion resistance; mixed-acid casting grade.
What is the yield strength of CW-12MW?
CW-12MW has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 60% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CW-12MW easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Very gummy and work-hardening — use rigid setups, positive-rake carbide or ceramic inserts, low speed (15–25 m/min carbide), heavy positive feed, flood coolant, and never dwell in the cut.
Can CW-12MW be welded?
Yes — weldability is rated good (55/100). GTAW/SMAW with matching ERNiCrMo-5 (or ENiCrMo-5) filler, low heat input, no preheat, interpass < 100 °C; re-solution anneal and quench after major weld repair to restore corrosion resistance.
What surface finishes work on CW-12MW?
Grit blast, pickle in HNO3–HF then passivate; electropolish or mechanically polish sealing faces; no anodising — apply no coating in acid service so the natural passive film works.
Can CW-12MW be formed, bent or molded?
Casting grade only — sand or investment cast with generous risering (wide freezing range, high shrinkage ~2.2 %); solution anneal after shakeout, machine allowances should account for hard skin.
What is the maximum service temperature of CW-12MW?
CW-12MW 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 CW-12MW-SA and CW-12MW-F?
SA is the default condition — standard supply condition for A494 CW-12MW corrosion castings — carbides dissolved, maximum corrosion resistance and ductility. F: only for non-critical, low-corrosivity duty or parts to be heat treated later; interdendritic carbides reduce ductility and intergranular corrosion resistance. Yield strength is 350 MPa in SA versus 340 MPa in F.
How much does CW-12MW cost?
CW-12MW 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 Specialty Handbook: Nickel, Cobalt, and Their Alloys — ASM International (2000)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Hastelloy C-type alloy physical and corrosion data — Haynes International (2020)
- UNS N30002 / J30002 alloy record — SAE/ASTM Unified Numbering System (2019)
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.