Steel SKS93-HR vs SKS93 Q&T 54-58 HRC
Steel · SKS93 temper comparison
SKS93-HR and SKS93 Q&T 54-58 HRC are two conditions of the same steel grade, SKS93: HR (hot rolled) versus Q&T 54-58 HRC (oil quenched, tempered ~250–300 °C). The chemistry is identical, so every difference below comes from the condition. SKS93 Q&T 54-58 HRC is the stronger of the two: yield strength 1,650 MPa (239 ksi) against 520 MPa (75.4 ksi) for SKS93-HR, about 3.2 times as much; tensile strength follows at 1,900 MPa (276 ksi) vs 900 MPa (131 ksi). In exchange, SKS93-HR is the more ductile: elongation 10% versus 2% for SKS93 Q&T 54-58 HRC, and SKS93-HR is harder (260 HB vs 200 HB). SKS93 Q&T 54-58 HRC runs hotter in service (230°C vs 200°C continuous). On the shop floor, SKS93-HR machines more easily (poor vs not recommended).
SKS93-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
SKS93 Q&T 54-58 HRCChoose it when strength drives the design, or when the part sees heat.
SKS93-HR vs SKS93 Q&T 54-58 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.
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)
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 · Charpy V-Notch Impact (RT) 8 J5.9 ft·lbf
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 1,470°C2,678 °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) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · 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) -0.6 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: Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.4 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.
SKS93-HR vs SKS93 Q&T 54-58 HRC — frequently asked
Is SKS93 Q&T 54-58 HRC stronger than SKS93-HR?
Yes. SKS93 Q&T 54-58 HRC has a typical yield strength of 1,650 MPa (239 ksi) against 520 MPa (75.4 ksi) for SKS93-HR — about 3.2 times as much. Tensile strength is 1,900 MPa (276 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, HR or Q&T 54-58 HRC?
Annealed is the default SKS93 condition in the FabDigit quote flow (neither HR nor Q&T 54-58 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, SKS93-HR or SKS93 Q&T 54-58 HRC?
SKS93-HR. Its machinability rates poor (32/100) against not recommended (12/100) for SKS93 Q&T 54-58 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SKS93-HR and SKS93 Q&T 54-58 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.