Stainless Steel 15-5 PH-H1150 vs 15-5 PH-H900
Stainless Steel · 15-5 PH temper comparison
15-5 PH-H1150 and 15-5 PH-H900 are two conditions of the same stainless steel grade, 15-5 PH: H1150 (overaged 621 °C (1150 °F) for 4 h, maximum toughness) versus H900 (aged 482 °C (900 °F) for 1 h, peak hardness). The chemistry is identical, so every difference below comes from the condition. 15-5 PH-H900 is the stronger of the two: yield strength 1,275 MPa (185 ksi) against 800 MPa (116 ksi) for 15-5 PH-H1150, about 59% more; tensile strength follows at 1,380 MPa (200 ksi) vs 965 MPa (140 ksi). In exchange, 15-5 PH-H1150 is the more ductile: elongation 18% versus 12% for 15-5 PH-H900, and 15-5 PH-H900 is harder (429 HB vs 302 HB). 15-5 PH-H1150 runs hotter in service (425°C vs 300°C continuous) and 15-5 PH-H1150 conducts heat better (21 W/m·K vs 17.9 W/m·K). On the shop floor, 15-5 PH-H1150 machines more easily (fair vs poor).
15-5 PH-H1150Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
15-5 PH-H900Choose it when strength drives the design.
15-5 PH-H1150 vs 15-5 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.
Elastic (Young's) Modulus
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: Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 148 GPa21.5 Msi · Poisson's Ratio 0.27
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °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 420 J/kg·K0.1 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) -0.28 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 70 / 100 · Castability 55 / 100 · Brazeability / Solderability 45 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 190 L/kg22.8 gal/lb · Typical Recycled Content 35%
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.
15-5 PH-H1150 vs 15-5 PH-H900 — frequently asked
Is 15-5 PH-H900 stronger than 15-5 PH-H1150?
Yes. 15-5 PH-H900 has a typical yield strength of 1,275 MPa (185 ksi) against 800 MPa (116 ksi) for 15-5 PH-H1150 — about 59% more. Tensile strength is 1,380 MPa (200 ksi) vs 965 MPa (140 ksi).
Which condition does FabDigit quote by default, H1150 or H900?
Condition A is the default 15-5 PH condition in the FabDigit quote flow (neither H1150 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, 15-5 PH-H1150 or 15-5 PH-H900?
15-5 PH-H1150. Its machinability rates fair (42/100) against poor (28/100) for 15-5 PH-H900.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15-5 PH-H1150 and 15-5 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.