Stainless Steel 17-4 PH-H1075 vs 17-4 PH-H900
Stainless Steel · 17-4 PH temper comparison
17-4 PH-H1075 and 17-4 PH-H900 are two conditions of the same stainless steel grade, 17-4 PH: H1075 (aged 579 °C (1075 °F) for 4 h) versus H900 (aged 482 °C (900 °F) for 1 h, peak hardness). The chemistry is identical, so every difference below comes from the condition. 17-4 PH-H900 is the stronger of the two: yield strength 1,275 MPa (185 ksi) against 1,000 MPa (145 ksi) for 17-4 PH-H1075, about 28% more; tensile strength follows at 1,380 MPa (200 ksi) vs 1,070 MPa (155 ksi). In exchange, 17-4 PH-H1075 is the more ductile: elongation 16% versus 12% for 17-4 PH-H900, and 17-4 PH-H900 is harder (420 HB vs 331 HB). 17-4 PH-H900 runs hotter in service (300°C vs 200°C continuous) and 17-4 PH-H900 conducts heat better (18.3 W/m·K vs 16.3 W/m·K). On the shop floor, 17-4 PH-H1075 machines more easily (fair vs poor).
17-4 PH-H1075Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
17-4 PH-H900Choose it when strength drives the design, or when the part sees heat.
17-4 PH-H1075 vs 17-4 PH-H900: 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.
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: Elastic (Young's) Modulus 196 GPa28.4 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 142 GPa20.6 Msi · Poisson's Ratio 0.27
Physical
Density and transition temperatures.
Same in both: Density 7.78 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,404°C2,559 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.8 µm/m·K6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -73°C-99 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 2.2 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 70 / 100 · Formability (cold) 35 / 100 · Castability 65 / 100 · Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 50%
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.
17-4 PH-H1075 vs 17-4 PH-H900 — frequently asked
Is 17-4 PH-H900 stronger than 17-4 PH-H1075?
Yes. 17-4 PH-H900 has a typical yield strength of 1,275 MPa (185 ksi) against 1,000 MPa (145 ksi) for 17-4 PH-H1075 — about 28% more. Tensile strength is 1,380 MPa (200 ksi) vs 1,070 MPa (155 ksi).
Which condition does FabDigit quote by default, H1075 or H900?
Condition A is the default 17-4 PH condition in the FabDigit quote flow (neither H1075 nor H900). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 17-4 PH-H1075 or 17-4 PH-H900?
17-4 PH-H1075. Its machinability rates fair (45/100) against poor (32/100) for 17-4 PH-H900.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17-4 PH-H1075 and 17-4 PH-H900 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.