Stainless Steel 17-4 PH vs PH14-8Mo
Stainless Steel · grade comparison
Stainless Steel 17-4 PH and PH14-8Mo are both stainless steel grades. 17-4 PH is the stronger of the two: yield strength 760 MPa (110 ksi) against 415 MPa (60.2 ksi) for PH14-8Mo, about 83% more; tensile strength follows at 1,030 MPa (149 ksi) vs 895 MPa (130 ksi). In exchange, PH14-8Mo is the more ductile: elongation 25% versus 12% for 17-4 PH, and 17-4 PH is harder (33 HRC vs 25 HRC). PH14-8Mo runs hotter in service (400°C vs 200°C continuous). On the shop floor, 17-4 PH welds better (very good vs good) and 17-4 PH sits in a lower cost tier (premium, $$$) than PH14-8Mo (high, $$$$).
17-4 PHChoose it when strength drives the design, or when it will be welded.
PH14-8MoChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
17-4 PH vs PH14-8Mo: 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)
Same in both: Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Latent Heat of Fusion 270 J/g116 BTU/lb
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.2 % IACS · Electrical Resistivity 8×10⁻⁷ Ω·m31.5 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
Formability (cold)
Castability
Same in both: Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 200 L/kg24 gal/lb
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 | 17-4 PH | PH14-8Mo |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| 3D printing | Yes | — |
| Casting & forging | Yes | — |
| Default condition | Condition A | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| AlCrN | Yes | — |
| AlTiN | Yes | — |
| Black Oxide | Yes | — |
| CVD Al2O3 | Yes | — |
| CVD TiCN | Yes | — |
| CVD TiN | Yes | — |
| Cerakote | Yes | — |
| Chrome Plating | Yes | — |
| CrN | Yes | — |
| DLC | Yes | — |
| Electropolished (Metal AM) | Yes | — |
| Electropolishing | Yes | — |
| HVOF Coating | Yes | — |
| MoS2 | Yes | — |
| Multilayer CVD | Yes | — |
| Nickel Plating | Yes | — |
| PTFE Coating | Yes | — |
| Painting | Yes | — |
They share 7 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Pickling, Plasma Spray, Silver Plating.
17-4 PH vs PH14-8Mo — frequently asked
Is 17-4 PH stronger than PH14-8Mo?
Yes. 17-4 PH has a typical yield strength of 760 MPa (110 ksi) against 415 MPa (60.2 ksi) for PH14-8Mo — about 83% more. Tensile strength is 1,030 MPa (149 ksi) vs 895 MPa (130 ksi).
Which is cheaper, 17-4 PH or PH14-8Mo?
17-4 PH is the lower-cost material: it sits in the premium tier ($$$) while PH14-8Mo 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, 17-4 PH or PH14-8Mo?
17-4 PH, by a small margin. Both rate fair for machinability — 45/100 against 40/100 for PH14-8Mo; for welding the order is 17-4 PH first (very good, 70/100) then PH14-8Mo (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17-4 PH and PH14-8Mo 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.