Steel 60CrMo3-3 +AC vs 60CrMo3-3 +QT
Steel · 60CrMo3-3 temper comparison
60CrMo3-3 +AC and 60CrMo3-3 +QT are two conditions of the same steel grade, 60CrMo3-3: +AC (spheroidize annealed) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 60CrMo3-3 +QT is the stronger of the two: yield strength 1,550 MPa (225 ksi) against 410 MPa (59.5 ksi) for 60CrMo3-3 +AC, about 3.8 times as much; tensile strength follows at 1,750 MPa (254 ksi) vs 690 MPa (100 ksi). In exchange, 60CrMo3-3 +AC is the more ductile: elongation 20% versus 7% for 60CrMo3-3 +QT, and 60CrMo3-3 +QT is harder (480 HB vs 205 HB). On the shop floor, 60CrMo3-3 +AC machines more easily (good vs poor) and 60CrMo3-3 +AC welds better (poor vs not recommended).
60CrMo3-3 +ACChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
60CrMo3-3 +QTChoose it when strength drives the design.
60CrMo3-3 +AC vs 60CrMo3-3 +QT: 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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79.5 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 1,600 MPa232 ksi · Shear Strength 1,050 MPa152 ksi · Fracture Toughness (K_IC) 45 MPa·√m41 ksi·√in · Charpy V-Notch Impact (RT) 15 J11.1 ft·lbf · Hardness, Rockwell C 48 HRC
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 470 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 · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.5 % IACS · Electrical Resistivity 2.3×10⁻⁷ Ω·m9.06 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 12 / 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 30 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 28 MJ/kg12,038 BTU/lb · Embodied Carbon (primary production) 2.1 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.
60CrMo3-3 +AC vs 60CrMo3-3 +QT — frequently asked
Is 60CrMo3-3 +QT stronger than 60CrMo3-3 +AC?
Yes. 60CrMo3-3 +QT has a typical yield strength of 1,550 MPa (225 ksi) against 410 MPa (59.5 ksi) for 60CrMo3-3 +AC — about 3.8 times as much. Tensile strength is 1,750 MPa (254 ksi) vs 690 MPa (100 ksi).
Which condition does FabDigit quote by default, +AC or +QT?
+QT is the default 60CrMo3-3 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, 60CrMo3-3 +AC or 60CrMo3-3 +QT?
60CrMo3-3 +AC. Its machinability rates good (55/100) against poor (25/100) for 60CrMo3-3 +QT; for welding the order is 60CrMo3-3 +AC first (poor, 25/100) then 60CrMo3-3 +QT (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 60CrMo3-3 +AC and 60CrMo3-3 +QT 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.