Stainless Steel CD4MCuN
ASTM CD4MCuN · UNS J93372 · EN 1.4515
CD4MCuN (ASTM A890/A995 Grade 1B, UNS J93372) is the nitrogen-enhanced version of the copper-bearing CD4MCu cast duplex stainless, with nitrogen added for better toughness and a more stable ferrite/austenite phase balance at the same strength and corrosion resistance.
Reference datasheet — CD4MCuN 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
CD4MCuN tempers and conditions
CD4MCuN 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 | Intermediate condition after pouring; unbalanced phases and intermetallics mean it must be solution treated before any corrosion or pressure service. | 500 | 650 | 8 | 28 HRC | 2.2 % IACS |
SADefault Solution annealed ~1120 °C and water quenched | Standard as-supplied condition for all pressure-retaining and corrosion service; gives the balanced 50/50 ferrite-austenite structure. | 550 | 730 | 25 | 24 HRC | 2.2 % IACS |
hot isostatically pressed then solution annealed and quenched | Choose for thick-section pump casings and valve bodies where shrinkage porosity must be closed for radiography and fatigue life. | 560 | 760 | 28 | 24 HRC | 2.2 % IACS |
SA + aged ~480 °C | Occasionally used for slurry-pump wear parts where extra hardness is wanted; sacrifices impact toughness and some corrosion margin, and is outside ASTM A890/A995 supply conditions. | 700 | 860 | 10 | 34 HRC | 2.4 % IACS |
What is CD4MCuN?
CD4MCuN (ASTM A890/A995 Grade 1B, UNS J93372) is the nitrogen-enhanced version of the copper-bearing CD4MCu cast duplex stainless, with nitrogen added for better toughness and a more stable ferrite/austenite phase balance at the same strength and corrosion resistance. It is poured as sand, investment and centrifugal castings and supplied solution-annealed, HIP plus solution-annealed, aged or as-cast, with 550 MPa yield, 730 MPa tensile, 25 % elongation and 250 HB. Service is capped near 300 °C by 475 °C embrittlement, and heavy sections need rapid quenching to avoid sigma phase; CD3MCuN (Grade 1C) is the lower-carbon alternative when weldability matters more. CD4MCuN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,410°C (2,570 °F). CD4MCuN has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 730 MPa (106 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
What is CD4MCuN used for?
- pump casings
- valve bodies
- wellhead components
- chloride service castings
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
Limitations
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
CD4MCuN properties
Typical room-temperature values for CD4MCuN-SA; bars are the position among stainless steel grades.
Physical3
CD4MCuN has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,410°C (2,570 °F).
Mechanical16
CD4MCuN has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 730 MPa (106 ksi) — stronger than 83% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CD4MCuN 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 µm/m·K (6.67 µin/in·°F).
Electrical3
CD4MCuN 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 CD4MCuN takes about 53 MJ of energy and emits 4.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CD4MCuN's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (55/100); formability poor (15/100).
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. CD4MCuN is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CD4MCuN
Is CD4MCuN easy to machine?
Machine like a duplex stainless: rigid setup, 30–60 % of 304 speeds, positive-rake coated carbide, heavy constant feed to cut under the work-hardened skin, flood coolant.
Can CD4MCuN be welded?
GTAW/SMAW with 25Cr duplex (ER2553/E2553) or over-alloyed 25Cr-9Ni-4Mo filler, interpass ≤150 °C, heat input 0.5–2.0 kJ/mm; full re-solution anneal + water quench is preferred after major weld repair.
Can CD4MCuN be formed, bent or molded?
Supplied only as castings — sand, investment or centrifugal; needs generous risering (wide freezing range), 1100–1150 °C solution treatment followed by rapid water quench to avoid σ-phase.
CD4MCuN 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 | ≤ 0.04 | 0.03 |
| Mn | ≤ 1 | 0.7 |
| Si | ≤ 1 | 0.8 |
| P | ≤ 0.04 | |
| S | ≤ 0.04 | |
| Cr | 24.5 – 26.5 | 25.5 |
| Ni | 4.7 – 6 | 5.4 |
| Mo | 1.7 – 2.3 | 2 |
| Cu | 2.7 – 3.3 | 3 |
| Nnitrogen addition distinguishing CD4MCuN from CD4MCu | 0.1 – 0.25 | 0.18 |
| Fe | balance |
What surface finishes work on CD4MCuN?
Passivate per ASTM A967 (nitric or citric) or pickle/electropolish after heat treatment; not anodizable — shot blast plus pickling is normal for cast surfaces.
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 CD4MCuN in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J93372
- ASTM
- A890 Grade 1BA995 Grade 1B
- EN / DIN / Werkstoff-Nr.
- 1.4515
How much does CD4MCuN cost?
CD4MCuN 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.
CD4MCuN — frequently asked
What is CD4MCuN used for?
CD4MCuN is typically used for pump casings, valve bodies, wellhead components and chloride service castings. In short: copper-bearing cast duplex; tougher than CD4MCu; 550 MPa cast yield.
What is the yield strength of CD4MCuN?
CD4MCuN has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 730 MPa (106 ksi) — stronger than 83% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CD4MCuN easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine like a duplex stainless: rigid setup, 30–60 % of 304 speeds, positive-rake coated carbide, heavy constant feed to cut under the work-hardened skin, flood coolant.
Can CD4MCuN be welded?
Yes — weldability is rated good (55/100). GTAW/SMAW with 25Cr duplex (ER2553/E2553) or over-alloyed 25Cr-9Ni-4Mo filler, interpass ≤150 °C, heat input 0.5–2.0 kJ/mm; full re-solution anneal + water quench is preferred after major weld repair.
What surface finishes work on CD4MCuN?
Passivate per ASTM A967 (nitric or citric) or pickle/electropolish after heat treatment; not anodizable — shot blast plus pickling is normal for cast surfaces.
Can CD4MCuN be formed, bent or molded?
Supplied only as castings — sand, investment or centrifugal; needs generous risering (wide freezing range), 1100–1150 °C solution treatment followed by rapid water quench to avoid σ-phase.
What is the maximum service temperature of CD4MCuN?
CD4MCuN 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 CD4MCuN-SA and CD4MCuN SA-AGED?
SA is the default condition — standard as-supplied condition for all pressure-retaining and corrosion service; gives the balanced 50/50 ferrite-austenite structure. SA-AGED: occasionally used for slurry-pump wear parts where extra hardness is wanted; sacrifices impact toughness and some corrosion margin, and is outside ASTM A890/A995 supply conditions. Yield strength is 550 MPa in SA versus 700 MPa in SA-AGED.
How much does CD4MCuN cost?
CD4MCuN 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)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (cast stainless) — ASM International (1990)
- Steel Castings Handbook (SFSA), 6th ed. — Steel Founders' Society of America / ASM (1995)
- UNS J93372 alloy data — SAE/ASTM Unified Numbering System (2019)
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.