Steel 18Ni(200) Maraging Steel vs HP9-4-30
Steel · grade comparison
Steel 18Ni(200) Maraging Steel and HP9-4-30 are both steel grades. HP9-4-30 is the stronger of the two: tensile strength 1,655 MPa (240 ksi) against 1,450 MPa (210 ksi) for 18Ni(200) Maraging Steel, about 14% more. HP9-4-30 is harder — 461 HB against 400 HB for 18Ni(200) Maraging Steel — which matters for wear surfaces and threads. HP9-4-30 is stiffer (200 GPa vs 186 GPa) and HP9-4-30 conducts heat better (24 W/m·K vs 20.5 W/m·K). On the shop floor, 18Ni(200) Maraging Steel welds better (very good vs fair).
18Ni(200) Maraging SteelChoose it when it will be welded.
HP9-4-30Choose it when strength drives the design, or when surface hardness matters.
18Ni(200) Maraging Steel vs HP9-4-30: 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.
18Ni(200) Maraging SteelHP9-4-30
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Tensile Strength (Ultimate)
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 · Poisson's Ratio 0.3 · Yield Strength (0.2% offset) 1,400 MPa203 ksi
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.
Same in both: Electrical Conductivity 3.8 % IACS · Electrical Resistivity 4.5×10⁻⁷ Ω·m17.7 µΩ·in
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
Castability
Brazeability / Solderability
Polishability
Same in both: Formability (cold) 15 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 | 18Ni(200) Maraging Steel | HP9-4-30 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
18Ni(200) Maraging Steel vs HP9-4-30 — frequently asked
Is HP9-4-30 stronger than 18Ni(200) Maraging Steel?
Yes. HP9-4-30 has a typical tensile strength of 1,655 MPa (240 ksi) against 1,450 MPa (210 ksi) for 18Ni(200) Maraging Steel — about 14% more.
Which is cheaper, 18Ni(200) Maraging Steel or HP9-4-30?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, 18Ni(200) Maraging Steel or HP9-4-30?
18Ni(200) Maraging Steel, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for HP9-4-30; for welding the order is 18Ni(200) Maraging Steel first (very good, 70/100) then HP9-4-30 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 18Ni(200) Maraging Steel and HP9-4-30 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.