Stainless Steel CK3MCuN-SA
Heat-treated state · default condition
ASTM CK3MCuN · UNS J93254 · EN 1.4593
SA = solution annealed 1150–1205 °C, water quenched
The only standard delivery condition for CK3MCuN castings: full solution anneal and rapid quench per ASTM A351/A743 to dissolve sigma/chi and restore corrosion resistance.
Values for the SA condition
Other CK3MCuN tempers and conditions
CK3MCuN is listed in 3 conditions; see the grade overview at CK3MCuN.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefaultThis page Solution annealed 1150–1205 °C, water quenched | The only standard delivery condition for CK3MCuN castings: full solution anneal and rapid quench per ASTM A351/A743 to dissolve sigma/chi and restore corrosion resistance. | 295 | 585 | 45 | 175 HB | — |
hot isostatically pressed then solution annealed | Choose for pressure-retaining or radiographed parts (pump casings, valve bodies) where shrinkage porosity must be closed to raise ductility and impact energy. | 300 | 605 | 50 | 175 HB | 2 % IACS |
Centrifugally cast, solution annealed | Pick for cylindrical products — pipe, sleeves, liners — where the finer, denser centrifugal structure gives slightly higher strength and better soundness than static castings. | 315 | 620 | 42 | 185 HB | 2 % IACS |
What is CK3MCuN-SA?
CK3MCuN-SA is CK3MCuN heat treated to SA — the only standard delivery condition for CK3MCuN castings: full solution anneal and rapid quench per ASTM A351/A743 to dissolve sigma/chi and restore corrosion resistance. CK3MCuN-SA has a yield strength of 295 MPa (42.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 70% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). CK3MCuN-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Advantages
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
CK3MCuN-SA properties
Typical room-temperature values for CK3MCuN-SA; 12 are specific to this condition. Other listed values are CK3MCuN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CK3MCuN-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical14
CK3MCuN-SA has a yield strength of 295 MPa (42.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 70% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
CK3MCuN-SA is rated for continuous service to 400°C (752 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
CK3MCuN-SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of CK3MCuN-SA takes about 78 MJ of energy and emits 5.2 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
CK3MCuN-SA's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (70/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CK3MCuN-SA
Is CK3MCuN easy to machine?
Difficult: heavily work-hardening — use rigid setups, sharp positive-rake carbide, low speed (25–45 m/min) with heavy constant feed and flood coolant, never dwell.
Can CK3MCuN be welded?
GTAW/GMAW with over-alloyed Ni-base filler (ERNiCrMo-3/ERNiCrMo-4); keep interpass below ~150 °C, low heat input, no preheat; re-solution anneal major repairs to restore PREN.
Can CK3MCuN be formed, bent or molded?
Wide freezing range demands generous risering and chills; pour hot with low nitrogen loss, and always solution anneal + water quench to dissolve sigma/chi phases.
What surface finishes work on CK3MCuN?
Pickle and passivate (HNO3-HF) after heat treatment or grinding to remove scale; the single-phase austenite polishes and electropolishes well, no coating normally required.
CK3MCuN 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 |
|---|---|---|
| Clow carbon to avoid sensitization | ≤ 0.03 | 0.02 |
| Mn | ≤ 1.2 | 0.8 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.01 | 0.01 |
| Cr | 19.5 – 20.5 | 20 |
| Ni | 17.5 – 19.5 | 18.5 |
| Mo | 6 – 7 | 6.5 |
| Cu | 0.5 – 1 | 0.7 |
| N | 0.18 – 0.24 | 0.21 |
| Fe | balance | — |
CK3MCuN-SA — frequently asked
What is CK3MCuN-SA used for?
CK3MCuN-SA is typically used for seawater pump and valve castings, offshore and desalination equipment and flue gas desulfurization components. In short: best chloride resistance here; cast 254SMO equivalent; seawater-grade super austenitic.
What is the yield strength of CK3MCuN-SA?
CK3MCuN-SA has a typical yield strength of 295 MPa (42.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 70% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CK3MCuN-SA easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Difficult: heavily work-hardening — use rigid setups, sharp positive-rake carbide, low speed (25–45 m/min) with heavy constant feed and flood coolant, never dwell.
Can CK3MCuN-SA be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with over-alloyed Ni-base filler (ERNiCrMo-3/ERNiCrMo-4); keep interpass below ~150 °C, low heat input, no preheat; re-solution anneal major repairs to restore PREN.
What surface finishes work on CK3MCuN-SA?
Pickle and passivate (HNO3-HF) after heat treatment or grinding to remove scale; the single-phase austenite polishes and electropolishes well, no coating normally required.
Can CK3MCuN-SA be formed, bent or molded?
Wide freezing range demands generous risering and chills; pour hot with low nitrogen loss, and always solution anneal + water quench to dissolve sigma/chi phases.
What is the maximum service temperature of CK3MCuN-SA?
CK3MCuN-SA is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CK3MCuN-SA and CK3MCuN CENT-SA?
SA is the default condition — the only standard delivery condition for CK3MCuN castings: full solution anneal and rapid quench per ASTM A351/A743 to dissolve sigma/chi and restore corrosion resistance. CENT-SA: pick for cylindrical products — pipe, sleeves, liners — where the finer, denser centrifugal structure gives slightly higher strength and better soundness than static castings. Yield strength is 295 MPa in SA versus 315 MPa in CENT-SA.
Sources
- ASTM A351/A351M Castings, Austenitic, for Pressure-Containing Parts — ASTM International (2023)
- ASTM A743/A743M and A744/A744M Corrosion-Resistant Iron-Chromium-Nickel Castings — ASTM International (2021)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- 254 SMO (UNS S31254) alloy datasheet — Outokumpu (2022)
- Steel Castings Handbook, Supplement 8 — High Alloy Data Sheets, Corrosion Series — Steel Founders' Society of America (2004)
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.