Stainless Steel 330 vs N-155 (Multimet)
Stainless Steel · grade comparison
Stainless Steel 330 and N-155 (Multimet) are both stainless steel grades. N-155 (Multimet) is the stronger of the two: yield strength 415 MPa (60.2 ksi) against 270 MPa (39.2 ksi) for 330, about 54% more; tensile strength follows at 815 MPa (118 ksi) vs 585 MPa (84.8 ksi). N-155 (Multimet) is harder — 200 HB against 150 HB for 330 — which matters for wear surfaces and threads. 330 is lighter (7.94 g/cm³ vs 8.19 g/cm³ for N-155 (Multimet)) and 330 runs hotter in service (1,150°C vs 815°C continuous). On the shop floor, 330 machines more easily (32 vs 20 out of 100), 330 forms better (65 vs 55 out of 100), and N-155 (Multimet) sits in a lower cost tier (high, $$$$) than 330 (specialty, $$$$$).
330Choose it when weight is the constraint, or when the part sees heat.
N-155 (Multimet)Choose it when strength drives the design, or when surface hardness matters.
330 vs N-155 (Multimet): 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
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
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
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Thermal Expansion (CTE, 20–100 °C) 14.4 µm/m·K8 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
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
Same in both: Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 95 MJ/kg40,843 BTU/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 3
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 | 330 | N-155 (Multimet) |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | Solution Annealed | — |
| Relative cost | $$$$$ Specialty | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| AlCrN | Yes | — |
| AlTiN | Yes | — |
| Black Oxide | Yes | — |
| CVD Al2O3 | Yes | — |
| CVD TiCN | Yes | — |
| CVD TiN | Yes | — |
| Cerakote | Yes | — |
| Chrome Plating | Yes | — |
| CrN | Yes | — |
| DLC | Yes | — |
| Electropolishing | Yes | — |
| HVOF Coating | Yes | — |
| MoS2 | Yes | — |
| Multilayer CVD | Yes | — |
| Nickel Plating | Yes | — |
| PTFE Coating | Yes | — |
| Painting | Yes | — |
| Passivation (Stainless Steel) | Yes | — |
They share 7 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Pickling, Plasma Spray, Silver Plating.
330 vs N-155 (Multimet) — frequently asked
Is N-155 (Multimet) stronger than 330?
Yes. N-155 (Multimet) has a typical yield strength of 415 MPa (60.2 ksi) against 270 MPa (39.2 ksi) for 330 — about 54% more. Tensile strength is 815 MPa (118 ksi) vs 585 MPa (84.8 ksi).
Which is cheaper, 330 or N-155 (Multimet)?
N-155 (Multimet) is the lower-cost material: it sits in the high tier ($$$$) while 330 is specialty ($$$$$). 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, 330 or N-155 (Multimet)?
330, by a small margin. Both rate poor for machinability — 32/100 against 20/100 for N-155 (Multimet); for welding the order is N-155 (Multimet) first (very good, 70/100) then 330 (good, 62/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 330 and N-155 (Multimet) 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.