Stainless Steel CE3MN
ASTM CE3MN · UNS J93404 · EN 1.4417, GX2CrNiMoN25-7-3
CE3MN (ASTM A890/A995 Grade 5A, UNS J93404, 1.4417 / 1.4477) is a cast super-duplex stainless of 25Cr-7Ni-4Mo-N composition, the casting equivalent of wrought 2507 (S32750), combining very high strength with pitting and crevice resistance for aggressive offshore and chemical service.
Reference datasheet — CE3MN 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
CE3MN tempers and conditions
CE3MN is supplied in 3 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Reference condition only: intermetallic and nitride precipitation from casting leaves low toughness and degraded corrosion resistance, so parts must be solution treated before service. | 540 | 720 | 12 | 28 HRC | 2.1 % IACS |
SADefault Solution annealed ≥1120 °C and water quenched | The only condition in which the grade may be supplied to A890/A995 — pick it for all seawater, offshore and chemical castings. | 560 | 780 | 28 | 24 HRC | — |
hot isostatically pressed, then solution annealed and quenched | Choose for pressure-containing or fatigue-critical subsea castings where microporosity must be closed and toughness/soundness maximised. | 575 | 800 | 32 | 25 HRC | 2.2 % IACS |
What is CE3MN?
CE3MN (ASTM A890/A995 Grade 5A, UNS J93404, 1.4417 / 1.4477) is a cast super-duplex stainless of 25Cr-7Ni-4Mo-N composition, the casting equivalent of wrought 2507 (S32750), combining very high strength with pitting and crevice resistance for aggressive offshore and chemical service. It is supplied solution-annealed, HIP plus solution-annealed or as-cast at 560 MPa yield, 780 MPa tensile, 28 % elongation and 250 HB, with the highest corrosion rating in this cast duplex family. Service is limited to about 280 °C, machinability is poor and welding needs tight ferrite control (weldability score 60); CD6MN or CE8MN cost less where chlorides are milder. CE3MN 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). CE3MN has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
What is CE3MN used for?
- subsea valve bodies
- high-chloride pump casings
- offshore manifolds
- desalination castings
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
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
CE3MN properties
Typical room-temperature values for CE3MN-SA; bars are the position among stainless steel grades.
Physical3
CE3MN 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
CE3MN has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CE3MN is rated for continuous service to 280°C (536 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
CE3MN conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of CE3MN takes about 75 MJ of energy and emits 5.2 kg of CO₂ — more than 84% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CE3MN's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (60/100); formability poor (25/100).
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. CE3MN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CE3MN
Is CE3MN easy to machine?
Machine like super-duplex: rigid setup, sharp coated carbide, low-to-moderate speed with heavy positive feed and generous coolant to avoid work-hardened glazing.
Can CE3MN be welded?
GTAW/SMAW with 25.10.4L (2507-matching) filler, no preheat, interpass below ~150 °C and controlled heat input to keep ferrite 35-55 % and avoid sigma/nitride precipitation.
Can CE3MN be formed, bent or molded?
Cast product only — no cold forming; foundry must hold nitrogen recovery, feed heavy sections well and solution treat ≥1120 °C followed by rapid water quench.
CE3MN 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 | ≤ 0.03 | 0.02 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.04 | 0.01 |
| Cr | 24 – 26 | 25 |
| Ni | 6 – 8 | 7 |
| Mo | 4 – 5 | 4.5 |
| Nkey austenite stabiliser; controls pitting resistance | 0.1 – 0.3 | 0.2 |
| Cu | ≤ 1.3 | 0.3 |
| Fe | balance |
What surface finishes work on CE3MN?
Grind/blast then citric or nitric passivation (ASTM A967); electropolishing gives best chloride performance, no anodising applicable.
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 CE3MN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does CE3MN cost?
CE3MN 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.
CE3MN — frequently asked
What is CE3MN used for?
CE3MN is typically used for subsea valve bodies, high-chloride pump casings, offshore manifolds and desalination castings. In short: cast equivalent of 2507; best chloride resistance here; highest strength cast duplex.
What is the yield strength of CE3MN?
CE3MN has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CE3MN easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine like super-duplex: rigid setup, sharp coated carbide, low-to-moderate speed with heavy positive feed and generous coolant to avoid work-hardened glazing.
Can CE3MN be welded?
Yes — weldability is rated good (60/100). GTAW/SMAW with 25.10.4L (2507-matching) filler, no preheat, interpass below ~150 °C and controlled heat input to keep ferrite 35-55 % and avoid sigma/nitride precipitation.
What surface finishes work on CE3MN?
Grind/blast then citric or nitric passivation (ASTM A967); electropolishing gives best chloride performance, no anodising applicable.
Can CE3MN be formed, bent or molded?
Cast product only — no cold forming; foundry must hold nitrogen recovery, feed heavy sections well and solution treat ≥1120 °C followed by rapid water quench.
What is the maximum service temperature of CE3MN?
CE3MN 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 CE3MN-SA and CE3MN-AC?
SA is the default condition — the only condition in which the grade may be supplied to A890/A995 — pick it for all seawater, offshore and chemical castings. AC: reference condition only: intermetallic and nitride precipitation from casting leaves low toughness and degraded corrosion resistance, so parts must be solution treated before service. Yield strength is 560 MPa in SA versus 540 MPa in AC.
How much does CE3MN cost?
CE3MN 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 (2020)
- ASTM A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex — ASTM (2018)
- EN 10283 — Corrosion-resistant steel castings (GX2CrNiMoN25-7-4, 1.4469/1.4477 family) — CEN (2019)
- Steel Castings Handbook, Supplement 8 — High Alloy Data Sheets, Corrosion Series — SFSA (2004)
- ASM Handbook Vol.1 & Vol.15 (Properties of Stainless Steels; Casting) — ASM International (2008)
- Sandvik SAF 2507 / UNS S32750 datasheet (physical property reference) — Alleima (Sandvik) (2023)
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.