Steel 1.2379 Nitrided vs 1.2379 Q&T 56-58 HRC
Steel · 1.2379 temper comparison
1.2379 Nitrided and 1.2379 Q&T 56-58 HRC are two conditions of the same steel grade, 1.2379: Nitrided versus Q&T 56-58 HRC (hardened, tempered ~300–350 °C). The chemistry is identical, so every difference below comes from the condition. Both yield at about 1,520 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (Nitrided versus hardened, tempered ~300–350 °C). 1.2379 Q&T 56-58 HRC is the more ductile: elongation 1.5% versus 1% for 1.2379 Nitrided, and 1.2379 Nitrided is harder (1,100 HV vs 625 HV). 1.2379 Nitrided runs hotter in service (450°C vs 300°C continuous).
1.2379 NitridedChoose it when the part sees heat.
1.2379 Q&T 56-58 HRCChoose it when the part is bent, formed or impact-loaded.
1.2379 Nitrided vs 1.2379 Q&T 56-58 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 Nitrided1.2379 Q&T 56-58 HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
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 · Compressive Strength 2,200 MPa319 ksi
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 20 W/m·K11.6 BTU/hr·ft·°F · 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.
Same in both: Electrical Conductivity 2.5 % IACS · Electrical Resistivity 6.9×10⁻⁷ Ω·m27.2 µΩ·in
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 Nitrided vs 1.2379 Q&T 56-58 HRC — frequently asked
What is the difference between 1.2379 Nitrided and 1.2379 Q&T 56-58 HRC?
1.2379 Nitrided and 1.2379 Q&T 56-58 HRC are two conditions of the same steel grade, 1.2379: Nitrided versus Q&T 56-58 HRC (hardened, tempered ~300–350 °C). The chemistry is identical, so every difference below comes from the condition. Both yield at about 1,520 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (Nitrided versus hardened, tempered ~300–350 °C).
Which condition does FabDigit quote by default, Nitrided or Q&T 56-58 HRC?
Annealed is the default 1.2379 condition in the FabDigit quote flow (neither Nitrided nor Q&T 56-58 HRC). 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 Nitrided or 1.2379 Q&T 56-58 HRC?
1.2379 Q&T 56-58 HRC, by a small margin. Both rate not recommended for machinability — 12/100 against 5/100 for 1.2379 Nitrided; for welding the order is 1.2379 Q&T 56-58 HRC first (not recommended, 8/100) then 1.2379 Nitrided (not recommended, 3/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.2379 Nitrided and 1.2379 Q&T 56-58 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.