Stainless Steel 17-7 PH-RH950 vs 17-7 PH-TH1050
Stainless Steel · 17-7 PH temper comparison
17-7 PH-RH950 and 17-7 PH-TH1050 are two conditions of the same stainless steel grade, 17-7 PH: RH950 (austenite conditioned (955 °C) + refrigerated (−73 °C) + aged 510 °C /…) versus TH1050 (austenite conditioned (760 °C) + aged 565 °C / 90 min). The chemistry is identical, so every difference below comes from the condition. 17-7 PH-RH950 is the stronger of the two: yield strength 1,310 MPa (190 ksi) against 1,170 MPa (170 ksi) for 17-7 PH-TH1050, about 12% more; tensile strength follows at 1,450 MPa (210 ksi) vs 1,275 MPa (185 ksi). In exchange, 17-7 PH-TH1050 is the more ductile: elongation 8% versus 6% for 17-7 PH-RH950.
17-7 PH-RH950Choose it when strength drives the design.
17-7 PH-TH1050Choose it when the part is bent, formed or impact-loaded.
17-7 PH-RH950 vs 17-7 PH-TH1050: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Same in both: Elastic (Young's) Modulus 204 GPa29.6 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 152 GPa22 Msi · Poisson's Ratio 0.28 · Hardness, Brinell 175 HB · Hardness, Rockwell B 85 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 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.
Same in both: Thermal Conductivity 16.4 W/m·K9.5 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -73°C-99 °F
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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Machinability 32 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 250 L/kg30 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.
17-7 PH-RH950 vs 17-7 PH-TH1050 — frequently asked
Is 17-7 PH-RH950 stronger than 17-7 PH-TH1050?
Yes. 17-7 PH-RH950 has a typical yield strength of 1,310 MPa (190 ksi) against 1,170 MPa (170 ksi) for 17-7 PH-TH1050 — about 12% more. Tensile strength is 1,450 MPa (210 ksi) vs 1,275 MPa (185 ksi).
Which condition does FabDigit quote by default, RH950 or TH1050?
Condition A is the default 17-7 PH condition in the FabDigit quote flow (neither RH950 nor TH1050). 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 welds better, 17-7 PH-RH950 or 17-7 PH-TH1050?
17-7 PH-TH1050. Its weldability rates fair (35/100) against poor (30/100) for 17-7 PH-RH950.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17-7 PH-RH950 and 17-7 PH-TH1050 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.