Stainless Steel CB7Cu-2 vs CD3MCuN
Stainless Steel · grade comparison
Stainless Steel CB7Cu-2 and CD3MCuN are both stainless steel grades. CB7Cu-2 is the stronger of the two: yield strength 860 MPa (125 ksi) against 550 MPa (79.8 ksi) for CD3MCuN, about 56% more; tensile strength follows at 1,000 MPa (145 ksi) vs 740 MPa (107 ksi). In exchange, CD3MCuN is the more ductile: elongation 32% versus 13% for CB7Cu-2, and CB7Cu-2 is harder (311 HB vs 230 HB). CB7Cu-2 conducts heat better (17.8 W/m·K vs 16 W/m·K). On the shop floor, CB7Cu-2 machines more easily (fair vs poor) and CB7Cu-2 sits in a lower cost tier (premium, $$$) than CD3MCuN (high, $$$$).
CB7Cu-2Choose it when strength drives the design, or when the part is machined in volume.
CD3MCuNChoose it when the part is bent, formed or impact-loaded.
CB7Cu-2 vs CD3MCuN: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Hardness, Rockwell B
Same in both: Shear Modulus 77 GPa11.2 Msi
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Same in both: Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 300°C572 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 2.2 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 70%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | CB7Cu-2 | CD3MCuN |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 7 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Pickling, Plasma Spray, Silver Plating.
CB7Cu-2 vs CD3MCuN — frequently asked
Is CB7Cu-2 stronger than CD3MCuN?
Yes. CB7Cu-2 has a typical yield strength of 860 MPa (125 ksi) against 550 MPa (79.8 ksi) for CD3MCuN — about 56% more. Tensile strength is 1,000 MPa (145 ksi) vs 740 MPa (107 ksi).
Which is cheaper, CB7Cu-2 or CD3MCuN?
CB7Cu-2 is the lower-cost material: it sits in the premium tier ($$$) while CD3MCuN is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, CB7Cu-2 or CD3MCuN?
CB7Cu-2. Its machinability rates fair (42/100) against poor (30/100) for CD3MCuN.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CB7Cu-2 and CD3MCuN side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.