Stainless Steel 17-7 PH Condition A vs 17-7 PH-R100
Stainless Steel · 17-7 PH temper comparison
17-7 PH Condition A and 17-7 PH-R100 are two conditions of the same stainless steel grade, 17-7 PH: Condition A (solution annealed) versus R100 (condition R-100). The chemistry is identical, so every difference below comes from the condition. 17-7 PH-R100 is the stronger of the two: yield strength 830 MPa (120 ksi) against 276 MPa (40 ksi) for 17-7 PH Condition A, about 3.0 times as much; tensile strength follows at 1,140 MPa (165 ksi) vs 896 MPa (130 ksi). In exchange, 17-7 PH Condition A is the more ductile: elongation 35% versus 8% for 17-7 PH-R100, and 17-7 PH-R100 is harder (327 HB vs 175 HB). On the shop floor, 17-7 PH Condition A welds better (good vs fair).
17-7 PH Condition AChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
17-7 PH-R100Choose it when strength drives the design.
17-7 PH Condition A vs 17-7 PH-R100: 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.
17-7 PH Condition A17-7 PH-R100
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)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 152 GPa22 Msi · Poisson's Ratio 0.28 · 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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: 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 Condition A vs 17-7 PH-R100 — frequently asked
Is 17-7 PH-R100 stronger than 17-7 PH Condition A?
Yes. 17-7 PH-R100 has a typical yield strength of 830 MPa (120 ksi) against 276 MPa (40 ksi) for 17-7 PH Condition A — about 3.0 times as much. Tensile strength is 1,140 MPa (165 ksi) vs 896 MPa (130 ksi).
Which condition does FabDigit quote by default, Condition A or R100?
Condition A is the default 17-7 PH condition in the FabDigit quote flow. 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, 17-7 PH Condition A or 17-7 PH-R100?
17-7 PH Condition A, by a small margin. Both rate poor for machinability — 32/100 against 26/100 for 17-7 PH-R100; for welding the order is 17-7 PH Condition A first (good, 55/100) then 17-7 PH-R100 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17-7 PH Condition A and 17-7 PH-R100 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.