Steel 17CrNi6-6 +AC vs 17CrNi6-6 +S
Steel · 17CrNi6-6 temper comparison
17CrNi6-6 +AC and 17CrNi6-6 +S are two conditions of the same steel grade, 17CrNi6-6: +AC (spheroidize annealed) versus +S (treated for shearability). The chemistry is identical, so every difference below comes from the condition. 17CrNi6-6 +S is the stronger of the two: yield strength 360 MPa (52.2 ksi) against 330 MPa (47.9 ksi) for 17CrNi6-6 +AC, about 9% more; tensile strength follows at 600 MPa (87 ksi) vs 560 MPa (81.2 ksi). In exchange, 17CrNi6-6 +AC is the more ductile: elongation 22% versus 19% for 17CrNi6-6 +S, and 17CrNi6-6 +S is harder (175 HB vs 165 HB). 17CrNi6-6 +AC runs hotter in service (350°C vs 200°C continuous).
17CrNi6-6 +ACChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
17CrNi6-6 +SChoose it when strength drives the design.
17CrNi6-6 +AC vs 17CrNi6-6 +S: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all 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 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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 465 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 16 / 100
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: Castability 30 / 100 · Brazeability / Solderability 60 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
17CrNi6-6 +AC vs 17CrNi6-6 +S — frequently asked
Is 17CrNi6-6 +S stronger than 17CrNi6-6 +AC?
Yes. 17CrNi6-6 +S has a typical yield strength of 360 MPa (52.2 ksi) against 330 MPa (47.9 ksi) for 17CrNi6-6 +AC — about 9% more. Tensile strength is 600 MPa (87 ksi) vs 560 MPa (81.2 ksi).
Which condition does FabDigit quote by default, +AC or +S?
+FP is the default 17CrNi6-6 condition in the FabDigit quote flow (neither +AC nor +S). 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, 17CrNi6-6 +AC or 17CrNi6-6 +S?
17CrNi6-6 +S, by a small margin. Both rate fair for machinability — 54/100 against 48/100 for 17CrNi6-6 +AC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17CrNi6-6 +AC and 17CrNi6-6 +S 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.