Stainless Steel CD3MCuN
ASTM CD3MCuN · UNS J93373
CD3MCuN (ASTM A890/A995 Grade 1C, UNS J93373) is the low-carbon variant of the copper-bearing CD4MCu cast duplex stainless family, where reduced carbon improves as-cast toughness and weldability while copper and nitrogen maintain the corrosion performance.
Reference datasheet — CD3MCuN 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
CD3MCuN tempers and conditions
CD3MCuN 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 | Reference only: the as-cast structure holds sigma phase and nitrides that cut elongation to 12 % and corrosion resistance, and the standard does not allow it as a delivery condition. | 540 | 700 | 12 | 24 HRC | 2.2 % IACS |
SADefault Solution annealed ≥1120 °C, water quenched | Use the standard supply condition, solution annealed at ≥1120 °C and water quenched, to dissolve sigma phase and balance the ferrite/austenite ratio for 550 MPa yield and full corrosion resistance. | 550 | 740 | 32 | 21 HRC | 2.2 % IACS |
Hot isostatically pressed then solution annealed and quenched | Choose hot isostatic pressing before solution annealing and quenching for critical high-pressure seawater pump casings and valve bodies that must be free of shrinkage porosity; elongation reaches 35 %. | 560 | 770 | 35 | 22 HRC | 2.2 % IACS |
Centrifugally cast, solution annealed | Pick centrifugally cast and solution annealed pipe or ring stock for a denser structure and slightly higher properties, 570 MPa yield and 780 MPa tensile, than equivalent sand castings. | 570 | 780 | 30 | 22 HRC | 2.2 % IACS |
What is CD3MCuN?
CD3MCuN (ASTM A890/A995 Grade 1C, UNS J93373) is the low-carbon variant of the copper-bearing CD4MCu cast duplex stainless family, where reduced carbon improves as-cast toughness and weldability while copper and nitrogen maintain the corrosion performance. Sand, investment and centrifugal castings are supplied solution-annealed, HIP plus solution-annealed, as-cast or centrifugal-cast and annealed, at 550 MPa yield, 740 MPa tensile, 32 % elongation and 230 HB. Maximum service temperature is about 300 °C because of 475 °C embrittlement; choose CD4MCuN (Grade 1B) when higher hardness is wanted, or CE3MN for severe chloride service. CD3MCuN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,380°C (2,516 °F). CD3MCuN has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
What is CD3MCuN used for?
- pump housings
- valve bodies
- marine hardware
- chemical processing equipment
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- High strength — 550 MPa (79.8 ksi), better than 83% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
CD3MCuN properties
Typical room-temperature values for CD3MCuN-SA; bars are the position among stainless steel grades.
Physical3
CD3MCuN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,380°C (2,516 °F).
Mechanical17
CD3MCuN has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CD3MCuN is rated for continuous service to 300°C (572 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
CD3MCuN conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of CD3MCuN takes about 47 MJ of energy and emits 3.6 kg of CO₂ — less than 87% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CD3MCuN's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (62/100); 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. CD3MCuN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CD3MCuN
Is CD3MCuN easy to machine?
Work-hardens strongly, so use rigid clamping, sharp coated carbide tooling, low speed with heavy feed and ample coolant. Avoid light rubbing cuts that glaze the surface.
Can CD3MCuN be welded?
Weldability is better than CD4MCu: use 25Cr super-duplex or higher-nickel filler such as ER2594/E2595, hold interpass temperature ≤150 °C and heat input 0.5–2.5 kJ/mm. Re-solution anneal and water quench critical parts after welding.
Can CD3MCuN be formed, bent or molded?
Sand, investment and centrifugal casting are all suitable. The relatively wide solidification range calls for good feeding and riser design, and castings must be solution treated at ≥1120 °C and water quenched.
CD3MCuN 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, improves weldability and toughness | ≤ 0.03 | 0.02 |
| Mn | ≤ 1.2 | 0.8 |
| Si | ≤ 1.1 | 0.8 |
| P | ≤ 0.03 | |
| SA995 often imposes a tighter limit | ≤ 0.03 | |
| Cr | 24 – 26.7 | 25.5 |
| Ni | 5.6 – 6.7 | 6.1 |
| Mo | 2.9 – 3.8 | 3.3 |
| Cuimproves resistance to sulfuric and phosphoric acids | 1.4 – 1.9 | 1.6 |
| Nstabilizes austenite, raises pitting resistance | 0.22 – 0.33 | 0.27 |
| Fe | balance |
What surface finishes work on CD3MCuN?
Pickling plus nitric passivation or electropolishing gives the best pitting resistance. Mechanical polishing is possible; anodizing does not apply.
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 CD3MCuN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J93373
- ASTM
- A890 Grade 1CA995 Grade 1C
How much does CD3MCuN cost?
CD3MCuN 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.
CD3MCuN — frequently asked
What is CD3MCuN used for?
CD3MCuN is typically used for pump housings, valve bodies, marine hardware and chemical processing equipment. In short: most weldable cast duplex; low-carbon copper-bearing duplex; good as-cast toughness.
What is the yield strength of CD3MCuN?
CD3MCuN has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 83% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CD3MCuN easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Work-hardens strongly, so use rigid clamping, sharp coated carbide tooling, low speed with heavy feed and ample coolant. Avoid light rubbing cuts that glaze the surface.
Can CD3MCuN be welded?
Yes — weldability is rated good (62/100). Weldability is better than CD4MCu: use 25Cr super-duplex or higher-nickel filler such as ER2594/E2595, hold interpass temperature ≤150 °C and heat input 0.5–2.5 kJ/mm. Re-solution anneal and water quench critical parts after welding.
What surface finishes work on CD3MCuN?
Pickling plus nitric passivation or electropolishing gives the best pitting resistance. Mechanical polishing is possible; anodizing does not apply.
Can CD3MCuN be formed, bent or molded?
Sand, investment and centrifugal casting are all suitable. The relatively wide solidification range calls for good feeding and riser design, and castings must be solution treated at ≥1120 °C and water quenched.
What is the maximum service temperature of CD3MCuN?
CD3MCuN is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CD3MCuN-SA and CD3MCuN CF-SA?
SA is the default condition — use the standard supply condition, solution annealed at ≥1120 °C and water quenched, to dissolve sigma phase and balance the ferrite/austenite ratio for 550 MPa yield and full corrosion resistance. CF-SA: pick centrifugally cast and solution annealed pipe or ring stock for a denser structure and slightly higher properties, 570 MPa yield and 780 MPa tensile, than equivalent sand castings. Yield strength is 550 MPa in SA versus 570 MPa in CF-SA.
How much does CD3MCuN cost?
CD3MCuN 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 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)
- ASM Handbook Vol.1: Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B: Corrosion — Materials — ASM International (2005)
- UNS J93373 alloy data (SAE/ASTM Metals & Alloys in the Unified Numbering System) — SAE International (2017)
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.