Steel 300M vs Maraging 300
Steel · grade comparison
Steel 300M and Maraging 300 are both steel grades, both aerospace steel. Maraging 300 is the stronger of the two: yield strength 800 MPa (116 ksi) against 760 MPa (110 ksi) for 300M, about 5% more. Maraging 300 is the more ductile: elongation 17% versus 12% for 300M, and 300M is harder (320 HB vs 300 HB). 300M is stiffer (200 GPa vs 180 GPa) and 300M conducts heat better (40 W/m·K vs 20 W/m·K). On the shop floor, Maraging 300 welds better (very good vs poor) and Maraging 300 sits in a lower cost tier (standard, $$) than 300M (specialty, $$$$$).
Maraging 300Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
300M vs Maraging 300: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all 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 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
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
Same in both: Bulk Modulus 160 GPa23.2 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)
Latent Heat of Fusion
Min Service Temperature
Same in both: Max Service Temperature (continuous) 400°C752 °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
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 20%
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 steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | 300M | Maraging 300 |
|---|---|---|
| 3D printing | — | Yes |
| Default condition | HR | Annealed |
| Relative cost | $$$$$ Specialty | $$ Standard |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
| Passivated (Metal AM) | — | Yes |
| Plated (Metal AM) | — | Yes |
Both are offered for CNC machining and Sheet metal. They share 38 finishes: AlCrN, AlTiN, Black Oxide, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, Chrome Plating, Copper Plating, CrN, DLC, E-Coating and 26 more.
300M vs Maraging 300 — frequently asked
Is Maraging 300 stronger than 300M?
Yes. Maraging 300 has a typical yield strength of 800 MPa (116 ksi) against 760 MPa (110 ksi) for 300M — about 5% more. Tensile strength is 1,010 MPa (146 ksi) vs 1,100 MPa (160 ksi).
Which is cheaper, 300M or Maraging 300?
Maraging 300 is the lower-cost material: it sits in the standard tier ($$) while 300M is specialty ($$$$$). 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, 300M or Maraging 300?
Maraging 300, by a small margin. Both rate fair for machinability — 45/100 against 38/100 for 300M; for welding the order is Maraging 300 first (very good, 80/100) then 300M (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 300M and Maraging 300 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.