Steel 54SiCrV6 +H vs 54SiCrV6 +QT
Steel · 54SiCrV6 temper comparison
54SiCrV6 +H and 54SiCrV6 +QT are two conditions of the same steel grade, 54SiCrV6: +H (hardened) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 54SiCrV6 +H is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 1,650 MPa (239 ksi) for 54SiCrV6 +QT, about 9% more; tensile strength follows at 2,200 MPa (319 ksi) vs 1,800 MPa (261 ksi). In exchange, 54SiCrV6 +QT is the more ductile: elongation 7% versus 1% for 54SiCrV6 +H, and 54SiCrV6 +H is harder (60 HRC vs 50 HRC). 54SiCrV6 +QT runs hotter in service (250°C vs 150°C continuous). On the shop floor, 54SiCrV6 +QT machines more easily (poor vs not recommended).
54SiCrV6 +HChoose it when strength drives the design.
54SiCrV6 +QTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
54SiCrV6 +H vs 54SiCrV6 +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
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
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 1,700 MPa247 ksi · Shear Strength 1,100 MPa160 ksi · Fatigue Strength (Endurance Limit) 800 MPa116 ksi
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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.2 % IACS · Electrical Resistivity 2.8×10⁻⁷ Ω·m11 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 %)
Formability (cold)
Same in both: Weldability 15 / 100 · Brazeability / Solderability 35 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
54SiCrV6 +H vs 54SiCrV6 +QT — frequently asked
Is 54SiCrV6 +H stronger than 54SiCrV6 +QT?
Yes. 54SiCrV6 +H has a typical yield strength of 1,800 MPa (261 ksi) against 1,650 MPa (239 ksi) for 54SiCrV6 +QT — about 9% more. Tensile strength is 2,200 MPa (319 ksi) vs 1,800 MPa (261 ksi).
Which condition does FabDigit quote by default, +H or +QT?
+QT is the default 54SiCrV6 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, 54SiCrV6 +H or 54SiCrV6 +QT?
54SiCrV6 +QT. Its machinability rates poor (25/100) against not recommended (8/100) for 54SiCrV6 +H.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 54SiCrV6 +H and 54SiCrV6 +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.