Stainless Steel CD3MWCuN SA-CF
Other
ASTM CD3MWCuN · UNS J93380
SA-CF = centrifugally cast tube/ring, solution annealed and quenched
Pick for seawater piping spools, sleeves and rings where the fine, dense centrifugal structure gives slightly higher strength and better soundness than static castings.
Values for the SA-CF condition
Other CD3MWCuN tempers and conditions
CD3MWCuN is listed in 4 conditions; see the grade overview at CD3MWCuN.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Only an intermediate shop condition: as-cast structure contains sigma/intermetallics and nitrides, so strength scatter is wide and corrosion/toughness are unacceptable — always solution treat before service. | 500 | 700 | 12 | 28 HRC | 2 % IACS |
SADefault Solution annealed 1100–1180 °C, water quenched | Standard and essentially only commercial delivery condition for CD3MWCuN castings; gives balanced ferrite/austenite, full corrosion resistance and code-compliant properties. | 530 | 780 | 32 | 24 HRC | — |
Hot isostatically pressed then solution annealed and quenched | Choose for thick-section, pressure-containing or NDE-critical castings where HIP closes internal microporosity and lifts ductility and toughness. | 545 | 800 | 36 | 25 HRC | 2 % IACS |
SA-CFThis page Centrifugally cast tube/ring, solution annealed and quenched | Pick for seawater piping spools, sleeves and rings where the fine, dense centrifugal structure gives slightly higher strength and better soundness than static castings. | 560 | 810 | 30 | 25 HRC | 2 % IACS |
What is CD3MWCuN SA-CF?
CD3MWCuN SA-CF is CD3MWCuN in the SA-CF condition — pick for seawater piping spools, sleeves and rings where the fine, dense centrifugal structure gives slightly higher strength and better soundness than static castings. CD3MWCuN SA-CF has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). CD3MWCuN SA-CF has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; SA-CF is available on request or by drawing note.
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 560 MPa (81.2 ksi), better than 85% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Limited formability — 18/100, worse than 89% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
CD3MWCuN SA-CF properties
Typical room-temperature values for CD3MWCuN SA-CF; 23 are specific to this condition. Other listed values are CD3MWCuN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CD3MWCuN SA-CF has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
CD3MWCuN SA-CF has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CD3MWCuN SA-CF is rated for continuous service to 280°C (536 °F). It conducts heat at 14.2 W/m·K (8.2 BTU/hr·ft·°F), worse than 76% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
CD3MWCuN SA-CF conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of CD3MWCuN SA-CF takes about 60 MJ of energy and emits 5.5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
CD3MWCuN SA-CF's machinability is poor (26/100, worse than 84% of stainless steel grades); weldability good (60/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CD3MWCuN SA-CF
Is CD3MWCuN easy to machine?
Work-hardens strongly and cuts hard — use rigid setups, sharp coated carbide, low speed / high feed, generous flood coolant and avoid dwelling to prevent glazing.
Can CD3MWCuN be welded?
Readily weldable with GTAW/SMAW using over-alloyed 25.10.4L (Zeron 100X) filler, N₂-bearing Ar shielding, interpass ≤150 °C and controlled heat input to keep ferrite 35–55 %; no PWHT, re-solution treat only if intermetallics are suspected.
Can CD3MWCuN be formed, bent or molded?
Sand or centrifugal casting with ~2.0–2.3 % shrinkage allowance; feed heavy sections well and quench from 1100–1180 °C fast enough to suppress sigma phase in thick walls.
What surface finishes work on CD3MWCuN?
Grit blast, pickle in HNO₃/HF and passivate per ASTM A967 to restore the passive film; electropolishing gives the best seawater performance — no anodizing.
CD3MWCuN 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 carbide sensitisation | ≤ 0.03 | 0.02 |
| Cr | 24 – 26 | 25 |
| Ni | 6.5 – 8.5 | 7.5 |
| Mo | 3 – 4 | 3.5 |
| Cu | 0.5 – 1 | 0.75 |
| Wtungsten raises crevice-corrosion resistance | 0.5 – 1 | 0.75 |
| Naustenite stabiliser, PREN contributor | 0.2 – 0.3 | 0.25 |
| Mn | ≤ 1 | 0.7 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Febalance; PREN = Cr + 3.3(Mo + 0.5W) + 16N ≈ 40–42 | balance | — |
CD3MWCuN SA-CF — frequently asked
What is CD3MWCuN SA-CF used for?
CD3MWCuN SA-CF is typically used for subsea valve bodies, offshore pump casings, seawater injection equipment and high-pressure fittings. In short: cast super duplex; seawater-grade castings; NORSOK-qualified chemistry.
What is the yield strength of CD3MWCuN SA-CF?
CD3MWCuN SA-CF has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 85% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CD3MWCuN SA-CF easy to machine?
Not especially — machinability is rated poor (26/100, worse than 84% of stainless steel grades). Work-hardens strongly and cuts hard — use rigid setups, sharp coated carbide, low speed / high feed, generous flood coolant and avoid dwelling to prevent glazing.
Can CD3MWCuN SA-CF be welded?
Yes — weldability is rated good (60/100). Readily weldable with GTAW/SMAW using over-alloyed 25.10.4L (Zeron 100X) filler, N₂-bearing Ar shielding, interpass ≤150 °C and controlled heat input to keep ferrite 35–55 %; no PWHT, re-solution treat only if intermetallics are suspected.
What surface finishes work on CD3MWCuN SA-CF?
Grit blast, pickle in HNO₃/HF and passivate per ASTM A967 to restore the passive film; electropolishing gives the best seawater performance — no anodizing.
Can CD3MWCuN SA-CF be formed, bent or molded?
Sand or centrifugal casting with ~2.0–2.3 % shrinkage allowance; feed heavy sections well and quench from 1100–1180 °C fast enough to suppress sigma phase in thick walls.
What is the maximum service temperature of CD3MWCuN SA-CF?
CD3MWCuN SA-CF is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CD3MWCuN-SA and CD3MWCuN-AC?
SA is the default condition — standard and essentially only commercial delivery condition for CD3MWCuN castings; gives balanced ferrite/austenite, full corrosion resistance and code-compliant properties. AC: only an intermediate shop condition: as-cast structure contains sigma/intermetallics and nitrides, so strength scatter is wide and corrosion/toughness are unacceptable — always solution treat before service. Yield strength is 530 MPa in SA versus 500 MPa in AC.
Sources
- ASTM A995/A995M — Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts — ASTM International (2020)
- ASTM A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex — ASTM International (2023)
- ASTM A923 — Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels — ASTM International (2022)
- EN 10283 / EN 10213 (1.4469 GX2CrNiMoCuN25-6-3-3 class castings) — CEN (2010)
- Zeron 100 super duplex stainless steel data sheet — Rolled Alloys / Neonickel (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA / International Molybdenum Association (2014)
- NORSOK M-630 Material Data Sheets (duplex castings) — Standards Norway (2021)
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.