Stainless Steel CD3MWCuN
ASTM CD3MWCuN · UNS J93380
CD3MWCuN (UNS J93380, ASTM A890/A995 Grade 6A, 1.4469) is a tungsten- and copper-bearing cast super duplex stainless matching wrought Zeron 100 / 2507 chemistry.
Reference datasheet — CD3MWCuN 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
CD3MWCuN tempers and conditions
CD3MWCuN 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 |
|---|---|---|---|---|---|---|
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 |
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 |
Supply forms, finishes and certifications
Ways CD3MWCuN is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
NORSOK | NORSOK M-630 / A923-tested | Certification |
What is CD3MWCuN?
CD3MWCuN (UNS J93380, ASTM A890/A995 Grade 6A, 1.4469) is a tungsten- and copper-bearing cast super duplex stainless matching wrought Zeron 100 / 2507 chemistry. It is specified for pressure-retaining castings in seawater service, delivering 530 MPa yield, 780 MPa tensile and 32 % elongation at about 250 HB with a corrosion rating of 86 and NORSOK-conforming supply conditions. Limits are a 280 °C service ceiling, low machinability (rating 28), mandatory solution treatment and rapid quench of heavy walls, and higher cost than CD3MN, which suits less aggressive chloride duty. CD3MWCuN 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). CD3MWCuN has a yield strength of 530 MPa (76.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 81% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
What is CD3MWCuN used for?
- subsea valve bodies
- offshore pump casings
- seawater injection equipment
- high-pressure fittings
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 530 MPa (76.9 ksi), better than 81% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Limited formability — 20/100, worse than 86% 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 properties
Typical room-temperature values for CD3MWCuN-SA; bars are the position among stainless steel grades.
Physical3
CD3MWCuN 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 has a yield strength of 530 MPa (76.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 81% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CD3MWCuN 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 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 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's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability good (60/100); formability poor (20/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. CD3MWCuN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CD3MWCuN
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.
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 |
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.
Surface treatments FabDigit runs on stainless steel 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel CD3MWCuN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J93380
- ASTM
- A890 Grade 6AA995 Grade 6AA890 Grade 3A
- Similar grades
- A890 Grade 5A1.4469GX2CrNiMoN26-7-4
How much does CD3MWCuN cost?
CD3MWCuN is a high-cost stainless steel ($$$$), 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.
CD3MWCuN — frequently asked
What is CD3MWCuN used for?
CD3MWCuN 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?
CD3MWCuN has a typical yield strength of 530 MPa (76.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 81% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CD3MWCuN easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% 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 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?
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 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?
CD3MWCuN 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.
How much does CD3MWCuN cost?
CD3MWCuN is a high-cost stainless steel ($$$$), 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 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; 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.