Steel 17CrS3 +AC vs 17CrS3 +H
Steel · 17CrS3 temper comparison
17CrS3 +AC and 17CrS3 +H are two conditions of the same steel grade, 17CrS3: +AC (spheroidize annealed) versus +H (hot rolled with specified (standard) hardenability band, Jominy…). The chemistry is identical, so every difference below comes from the condition. 17CrS3 +H is the stronger of the two: yield strength 370 MPa (53.7 ksi) against 310 MPa (45 ksi) for 17CrS3 +AC, about 19% more; tensile strength follows at 600 MPa (87 ksi) vs 500 MPa (72.5 ksi). In exchange, 17CrS3 +AC is the more ductile: elongation 23% versus 17% for 17CrS3 +H, and 17CrS3 +H is harder (175 HB vs 155 HB).
17CrS3 +ACChoose it when the part is bent, formed or impact-loaded.
17CrS3 +HChoose it when strength drives the design.
17CrS3 +AC vs 17CrS3 +H: 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
Shear Strength
Fatigue Strength (Endurance Limit)
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 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 490 MPa71.1 ksi · Fracture Toughness (K_IC) 75 MPa·√m68.3 ksi·√in
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.
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -25°C-13 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 11 / 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: Brazeability / Solderability 60 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
17CrS3 +AC vs 17CrS3 +H — frequently asked
Is 17CrS3 +H stronger than 17CrS3 +AC?
Yes. 17CrS3 +H has a typical yield strength of 370 MPa (53.7 ksi) against 310 MPa (45 ksi) for 17CrS3 +AC — about 19% more. Tensile strength is 600 MPa (87 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, +AC or +H?
+AC+C is the default 17CrS3 condition in the FabDigit quote flow (neither +AC nor +H). 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.
When should I choose 17CrS3 +AC over 17CrS3 +H?
Pick 17CrS3 +AC when the part is bent, formed or impact-loaded. Pick 17CrS3 +H when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 17CrS3 +AC and 17CrS3 +H 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.