Nickel Alloy CW-6MC SA-WR
Heat-treated state
UNS N26625, J26625 · ASTM A494 CW6MC
SA-WR = weld-repaired casting, re-solution annealed after repair
Foundry-repaired castings (ERNiCrMo-3 filler) re-solution treated to restore corrosion performance in the repair zone.
Values for the SA-WR condition
Other CW-6MC tempers and conditions
CW-6MC is listed in 4 conditions; see the grade overview at CW-6MC.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed (≈1120 °C, water quenched), ASTM A494 supply condition | Standard delivery condition for A494 CW-6MC castings: dissolves interdendritic carbides/Laves for maximum corrosion resistance and ductility. | 315 | 550 | 40 | 180 HB | — |
hot isostatically pressed then solution annealed | Choose for fatigue- or pressure-critical castings: HIP closes microporosity, giving higher ductility and more consistent fatigue life. | 320 | 575 | 46 | 180 HB | 1.3 % IACS |
SA-WRThis page Weld-repaired casting, re-solution annealed after repair | Foundry-repaired castings (ERNiCrMo-3 filler) re-solution treated to restore corrosion performance in the repair zone. | 320 | 540 | 35 | 185 HB | 1.3 % IACS |
Spheroidize annealed | Only for non-critical or low-corrosivity duty — interdendritic Nb-rich Laves/carbides lower ductility and localized corrosion resistance. | 350 | 520 | 22 | 14 HRC | 1.3 % IACS |
What is CW-6MC SA-WR?
CW-6MC SA-WR is CW-6MC heat treated to SA-WR — foundry-repaired castings (ERNiCrMo-3 filler) re-solution treated to restore corrosion performance in the repair zone. CW-6MC SA-WR has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 69% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi). CW-6MC SA-WR has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 60% of nickel alloy grades. It melts at 1,290°C (2,354 °F). SA is the default condition FabDigit quotes; SA-WR is available on request or by drawing note.
Advantages
- Good corrosion resistance — 88/100, better than 81% of nickel alloy grades
Limitations
- Poor heat conductor — 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades
- Limited formability — 18/100, worse than 79% of nickel alloy grades
CW-6MC SA-WR properties
Typical room-temperature values for CW-6MC SA-WR; 22 are specific to this condition. Other listed values are CW-6MC reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
CW-6MC SA-WR has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 60% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical14
CW-6MC SA-WR has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 69% of nickel alloy grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CW-6MC SA-WR is rated for continuous service to 900°C (1,652 °F). It conducts heat at 9.8 W/m·K (5.66 BTU/hr·ft·°F), worse than 92% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
CW-6MC SA-WR conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 81% of nickel alloy grades.
Sustainability4
Producing a kilogram of CW-6MC SA-WR takes about 155 MJ of energy and emits 13 kg of CO₂ — less than 58% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
CW-6MC SA-WR's machinability is poor (21/100, better than 59% of nickel alloy grades); weldability very good (80/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CW-6MC SA-WR
Is CW-6MC easy to machine?
Tough, work-hardening alloy — rigid setup, sharp positive-rake carbide/ceramic tools, low speed with heavy feed, flood coolant, avoid dwelling.
Can CW-6MC be welded?
Very good weldability with GTAW/GMAW using ERNiCrMo-3 (AWS A5.14); low heat input, no preheat, PWHT normally unnecessary but re-solution treatment restores best corrosion resistance.
Can CW-6MC be formed, bent or molded?
Sand or investment cast with generous risering because of the wide freezing range; feed heavy sections and control Nb segregation, then solution treat and water quench.
What surface finishes work on CW-6MC?
Pickle/passivate (HNO₃-HF then nitric) to remove casting scale; takes electropolish and mechanical polish well, no anodizing applicable.
CW-6MC 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 |
|---|---|---|
| C | ≤ 0.06 | 0.03 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Cr | 20 – 23 | 21.5 |
| Mo | 8 – 10 | 9 |
| NbNb + Ta | 3.15 – 4.5 | 3.7 |
| Fe | ≤ 5 | 3 |
| Al | ≤ 0.4 | 0.2 |
| Ti | ≤ 0.4 | 0.2 |
| Ni | ≥ 58 (balance) | — |
CW-6MC SA-WR — frequently asked
What is CW-6MC SA-WR used for?
CW-6MC SA-WR is typically used for valve trim castings, pump casings for sour service and marine casting components. In short: weldable cast Alloy 625; all-round cast Ni-Cr-Mo; seawater and sour service.
What is the yield strength of CW-6MC SA-WR?
CW-6MC SA-WR has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 69% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CW-6MC SA-WR easy to machine?
Not especially — machinability is rated poor (21/100, better than 59% of nickel alloy grades). Tough, work-hardening alloy — rigid setup, sharp positive-rake carbide/ceramic tools, low speed with heavy feed, flood coolant, avoid dwelling.
Can CW-6MC SA-WR be welded?
Yes — weldability is rated very good (80/100). Very good weldability with GTAW/GMAW using ERNiCrMo-3 (AWS A5.14); low heat input, no preheat, PWHT normally unnecessary but re-solution treatment restores best corrosion resistance.
What surface finishes work on CW-6MC SA-WR?
Pickle/passivate (HNO₃-HF then nitric) to remove casting scale; takes electropolish and mechanical polish well, no anodizing applicable.
Can CW-6MC SA-WR be formed, bent or molded?
Sand or investment cast with generous risering because of the wide freezing range; feed heavy sections and control Nb segregation, then solution treat and water quench.
What is the maximum service temperature of CW-6MC SA-WR?
CW-6MC SA-WR is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CW-6MC-SA and CW-6MC-AC?
SA is the default condition — standard delivery condition for A494 CW-6MC castings: dissolves interdendritic carbides/Laves for maximum corrosion resistance and ductility. AC: only for non-critical or low-corrosivity duty — interdendritic Nb-rich Laves/carbides lower ductility and localized corrosion resistance. Yield strength is 315 MPa in SA versus 350 MPa in AC.
Sources
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy — ASTM International (2023)
- INCONEL alloy 625 technical bulletin — Special Metals Corporation (2013)
- ASM Handbook Vol. 1 & Vol. 2 — Properties of Nickel and Nickel Alloys / Castings — ASM International (1990)
- AWS A5.14 ERNiCrMo-3 filler metal specification — American Welding Society (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.