Steel 1.2379 Annealed vs 1.2379 Q&T 54-56 HRC
Steel · 1.2379 temper comparison
1.2379 Annealed and 1.2379 Q&T 54-56 HRC are two conditions of the same steel grade, 1.2379: Annealed versus Q&T 54-56 HRC (secondary-hardening temper ~500–525 °C). The chemistry is identical, so every difference below comes from the condition. 1.2379 Q&T 54-56 HRC is the stronger of the two: yield strength 1,500 MPa (218 ksi) against 480 MPa (69.6 ksi) for 1.2379 Annealed, about 3.1 times as much; tensile strength follows at 1,750 MPa (254 ksi) vs 800 MPa (116 ksi). In exchange, 1.2379 Annealed is the more ductile: elongation 12% versus 1.5% for 1.2379 Q&T 54-56 HRC, and 1.2379 Q&T 54-56 HRC is harder (570 HB vs 235 HB). 1.2379 Q&T 54-56 HRC runs hotter in service (450°C vs 200°C continuous). On the shop floor, 1.2379 Annealed machines more easily (fair vs not recommended).
1.2379 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1.2379 Q&T 54-56 HRCChoose it when strength drives the design, or when the part sees heat.
1.2379 Annealed vs 1.2379 Q&T 54-56 HRC: 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.
1.2379 Annealed1.2379 Q&T 54-56 HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.9 µm/m·K6.1 µin/in·°F · Min Service Temperature -30°C-22 °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) -0.35 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: Castability 20 / 100 · Brazeability / Solderability 35 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 65 L/kg7.8 gal/lb · Typical Recycled Content 40%
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.
1.2379 Annealed vs 1.2379 Q&T 54-56 HRC — frequently asked
Is 1.2379 Q&T 54-56 HRC stronger than 1.2379 Annealed?
Yes. 1.2379 Q&T 54-56 HRC has a typical yield strength of 1,500 MPa (218 ksi) against 480 MPa (69.6 ksi) for 1.2379 Annealed — about 3.1 times as much. Tensile strength is 1,750 MPa (254 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T 54-56 HRC?
Annealed is the default 1.2379 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, 1.2379 Annealed or 1.2379 Q&T 54-56 HRC?
1.2379 Annealed. Its machinability rates fair (35/100) against not recommended (13/100) for 1.2379 Q&T 54-56 HRC; for welding the order is 1.2379 Annealed first (poor, 15/100) then 1.2379 Q&T 54-56 HRC (not recommended, 8/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.2379 Annealed and 1.2379 Q&T 54-56 HRC 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.