Steel 12CrMo-HR vs 12CrMo-QT
Steel · 12CrMo temper comparison
12CrMo-HR and 12CrMo-QT are two conditions of the same steel grade, 12CrMo: HR (hot rolled) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 12CrMo-QT is the stronger of the two: yield strength 410 MPa (59.5 ksi) against 295 MPa (42.8 ksi) for 12CrMo-HR, about 39% more; tensile strength follows at 570 MPa (82.7 ksi) vs 490 MPa (71.1 ksi). In exchange, 12CrMo-HR is the more ductile: elongation 24% versus 21% for 12CrMo-QT, and 12CrMo-QT is harder (180 HB vs 155 HB).
12CrMo-HRChoose it when the part is bent, formed or impact-loaded.
12CrMo-QTChoose it when strength drives the design.
12CrMo-HR vs 12CrMo-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
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 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 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) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 42 W/m·K24.3 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 · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % 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) -0.62 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 %)
Formability (cold)
Same in both: Weldability 62 / 100 · Brazeability / Solderability 50 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 29 MJ/kg12,468 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 65 L/kg7.8 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.
12CrMo-HR vs 12CrMo-QT — frequently asked
Is 12CrMo-QT stronger than 12CrMo-HR?
Yes. 12CrMo-QT has a typical yield strength of 410 MPa (59.5 ksi) against 295 MPa (42.8 ksi) for 12CrMo-HR — about 39% more. Tensile strength is 570 MPa (82.7 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, HR or QT?
N+T is the default 12CrMo condition in the FabDigit quote flow (neither HR nor QT). 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 12CrMo-HR over 12CrMo-QT?
Pick 12CrMo-HR when the part is bent, formed or impact-loaded. Pick 12CrMo-QT when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 12CrMo-HR and 12CrMo-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.