Stainless Steel CE8MN
ASTM CE8MN · UNS J93345
CE8MN (ASTM A890/A995 Grade 2A, UNS J93345) is a higher-nickel cast duplex stainless with elevated Cr-Mo-N content, used where general corrosion and pitting resistance must exceed that of CD4MCu.
Reference datasheet — CE8MN 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
CE8MN tempers and conditions
CE8MN 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 | Only for trial castings or non-corrosive structural use — as-cast CE8MN contains intermetallics and nitrides that sharply cut toughness and corrosion resistance. | 480 | 690 | 12 | 22 HRC | 2.2 % IACS |
SADefault Solution annealed ≥1120 °C and water quenched | Standard supply condition for all CE8MN castings — the only condition permitted by ASTM A890/A995 for corrosion service. | 500 | 720 | 30 | 20 HRC | — |
hot isostatically pressed then solution annealed and quenched | Choose for pressure-retaining or fatigue-critical castings where internal porosity must be closed and radiographic quality raised. | 510 | 750 | 34 | 20 HRC | 2.2 % IACS |
What is CE8MN?
CE8MN (ASTM A890/A995 Grade 2A, UNS J93345) is a higher-nickel cast duplex stainless with elevated Cr-Mo-N content, used where general corrosion and pitting resistance must exceed that of CD4MCu. It is poured as sand and investment castings and supplied solution-annealed, HIP plus solution-annealed or as-cast, with 500 MPa yield, 720 MPa tensile, 30 % elongation and 210 HB. Service is limited to about 315 °C by ferrite embrittlement, and the alloy work-hardens heavily in the cut; where chloride pitting is more severe still, CE3MN (Grade 5A super duplex) is the next step up. CE8MN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F). CE8MN has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 195 GPa (28.3 Msi).
What is CE8MN used for?
- chemical process pumps
- valves for aggressive media
- marine and offshore castings
Advantages
- High strength — 500 MPa (72.5 ksi), better than 77% of stainless steel grades
Limitations
- Limited service temperature — 315°C (599 °F), worse than 85% of stainless steel grades
CE8MN properties
Typical room-temperature values for CE8MN-SA; bars are the position among stainless steel grades.
Physical3
CE8MN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
CE8MN has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 77% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
CE8MN is rated for continuous service to 315°C (599 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
CE8MN conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of CE8MN takes about 60 MJ of energy and emits 5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 80%.
Manufacturability7
CE8MN's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability good (65/100); formability poor (30/100).
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. CE8MN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CE8MN
Is CE8MN easy to machine?
Work-hardening and tough — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and copious coolant; avoid dwelling to prevent glazing.
Can CE8MN be welded?
Weldable with GTAW/SMAW using over-alloyed 25Cr duplex filler (e.g. ER2594/E2209 class per application); control heat input and interpass ≤150 °C, no preheat, and re-solution-anneal major repairs to restore phase balance.
Can CE8MN be formed, bent or molded?
Supplied as sand or investment castings; provide generous risers and controlled solidification, and always solution anneal ≥1120 °C with rapid water quench to dissolve sigma and chi phases.
CE8MN 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 | ≤ 0.08 | 0.06 |
| Mn | ≤ 1 | 0.7 |
| Si | ≤ 1.5 | 1 |
| P | ≤ 0.04 | |
| S | ≤ 0.04 | |
| Cr | 22.5 – 25.5 | 24 |
| Ni | 8 – 11 | 9.5 |
| Mo | 3 – 4.5 | 3.7 |
| NNitrogen stabilises austenite and raises pitting resistance | 0.1 – 0.3 | 0.2 |
| Fe | balance |
What surface finishes work on CE8MN?
Pickle and passivate after welding or grinding to remove heat tint and restore the passive film; takes a good mechanical polish, no anodizing 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 CE8MN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J93345
- ASTM
- A890 Grade 2AA995 Grade 2A
How much does CE8MN cost?
CE8MN is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
CE8MN — frequently asked
What is CE8MN used for?
CE8MN is typically used for chemical process pumps, valves for aggressive media and marine and offshore castings. In short: higher-nickel cast duplex; better corrosion than CD4MCu; 315 °C service ceiling.
What is the yield strength of CE8MN?
CE8MN has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 77% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CE8MN easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Work-hardening and tough — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and copious coolant; avoid dwelling to prevent glazing.
Can CE8MN be welded?
Yes — weldability is rated good (65/100). Weldable with GTAW/SMAW using over-alloyed 25Cr duplex filler (e.g. ER2594/E2209 class per application); control heat input and interpass ≤150 °C, no preheat, and re-solution-anneal major repairs to restore phase balance.
What surface finishes work on CE8MN?
Pickle and passivate after welding or grinding to remove heat tint and restore the passive film; takes a good mechanical polish, no anodizing applicable.
Can CE8MN be formed, bent or molded?
Supplied as sand or investment castings; provide generous risers and controlled solidification, and always solution anneal ≥1120 °C with rapid water quench to dissolve sigma and chi phases.
What is the maximum service temperature of CE8MN?
CE8MN is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CE8MN-SA and CE8MN-AC?
SA is the default condition — standard supply condition for all CE8MN castings — the only condition permitted by ASTM A890/A995 for corrosion service. AC: only for trial castings or non-corrosive structural use — as-cast CE8MN contains intermetallics and nitrides that sharply cut toughness and corrosion resistance. Yield strength is 500 MPa in SA versus 480 MPa in AC.
How much does CE8MN cost?
CE8MN is a premium-cost stainless steel ($$$), cheaper than about 51% 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 A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex — ASTM International (2023)
- ASTM A995/A995M — Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts — ASTM International (2020)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- UNS J93345 alloy data — SAE/ASTM Unified Numbering System (2020)
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.