Stainless Steel 15-7 Mo Condition A vs 15-7 Mo Condition R100
Stainless Steel · 15-7 Mo temper comparison
15-7 Mo Condition A and 15-7 Mo Condition R100 are two conditions of the same stainless steel grade, 15-7 Mo: Condition A (solution annealed) versus Condition R100 (austenite conditioned at 954 °C (1750 °F) + refrigerated to −73 °C). The chemistry is identical, so every difference below comes from the condition. 15-7 Mo Condition R100 is the stronger of the two: yield strength 860 MPa (125 ksi) against 415 MPa (60.2 ksi) for 15-7 Mo Condition A, about 107% more; tensile strength follows at 1,170 MPa (170 ksi) vs 950 MPa (138 ksi). In exchange, 15-7 Mo Condition A is the more ductile: elongation 25% versus 7% for 15-7 Mo Condition R100, and 15-7 Mo Condition R100 is harder (336 HB vs 200 HB). On the shop floor, 15-7 Mo Condition A machines more easily (fair vs poor) and 15-7 Mo Condition A welds better (50 vs 38 out of 100).
15-7 Mo Condition AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
15-7 Mo Condition R100Choose it when strength drives the design.
15-7 Mo Condition A vs 15-7 Mo Condition 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.
15-7 Mo Condition A15-7 Mo Condition R100
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 92 HRB
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
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 425°C797 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 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) 68 MJ/kg29,235 BTU/lb · Embodied Carbon (primary production) 5.4 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 30%
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.
15-7 Mo Condition A vs 15-7 Mo Condition R100 — frequently asked
Is 15-7 Mo Condition R100 stronger than 15-7 Mo Condition A?
Yes. 15-7 Mo Condition R100 has a typical yield strength of 860 MPa (125 ksi) against 415 MPa (60.2 ksi) for 15-7 Mo Condition A — about 107% more. Tensile strength is 1,170 MPa (170 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, Condition A or Condition R100?
Condition A is the default 15-7 Mo 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, 15-7 Mo Condition A or 15-7 Mo Condition R100?
15-7 Mo Condition A. Its machinability rates fair (45/100) against poor (26/100) for 15-7 Mo Condition R100; for welding the order is 15-7 Mo Condition A first (fair, 50/100) then 15-7 Mo Condition R100 (fair, 38/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15-7 Mo Condition A and 15-7 Mo Condition 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.