Steel SKS93 Q&T 54-58 HRC vs SKS93 Q&T 58-61 HRC
Steel · SKS93 temper comparison
SKS93 Q&T 54-58 HRC and SKS93 Q&T 58-61 HRC are two conditions of the same steel grade, SKS93: Q&T 54-58 HRC (oil quenched, tempered ~250–300 °C) versus Q&T 58-61 HRC (oil quenched, tempered ~200 °C). The chemistry is identical, so every difference below comes from the condition. SKS93 Q&T 58-61 HRC is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 1,650 MPa (239 ksi) for SKS93 Q&T 54-58 HRC, about 12% more; tensile strength follows at 2,100 MPa (305 ksi) vs 1,900 MPa (276 ksi). In exchange, SKS93 Q&T 54-58 HRC is the more ductile: elongation 2% versus 1% for SKS93 Q&T 58-61 HRC, and SKS93 Q&T 58-61 HRC is harder (700 HV vs 620 HV). SKS93 Q&T 54-58 HRC runs hotter in service (230°C vs 200°C continuous).
SKS93 Q&T 54-58 HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SKS93 Q&T 58-61 HRCChoose it when strength drives the design.
SKS93 Q&T 54-58 HRC vs SKS93 Q&T 58-61 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.
SKS93 Q&T 54-58 HRCSKS93 Q&T 58-61 HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
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 · Reduction in Area 35% · Shear Strength 470 MPa68.2 ksi · Hardness, Brinell 200 HB · Hardness, Rockwell B 93 HRB
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · 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.
Same in both: Electrical Conductivity 8.6 % IACS · Electrical Resistivity 2×10⁻⁷ Ω·m7.87 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 %)
Same in both: Weldability 18 / 100 · Formability (cold) 45 / 100 · 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 Q&T 54-58 HRC vs SKS93 Q&T 58-61 HRC — frequently asked
Is SKS93 Q&T 58-61 HRC stronger than SKS93 Q&T 54-58 HRC?
Yes. SKS93 Q&T 58-61 HRC has a typical yield strength of 1,850 MPa (268 ksi) against 1,650 MPa (239 ksi) for SKS93 Q&T 54-58 HRC — about 12% more. Tensile strength is 2,100 MPa (305 ksi) vs 1,900 MPa (276 ksi).
Which condition does FabDigit quote by default, Q&T 54-58 HRC or Q&T 58-61 HRC?
Annealed is the default SKS93 condition in the FabDigit quote flow (neither Q&T 54-58 HRC nor Q&T 58-61 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.
When should I choose SKS93 Q&T 54-58 HRC over SKS93 Q&T 58-61 HRC?
Pick SKS93 Q&T 54-58 HRC when the part is bent, formed or impact-loaded, or when the part sees heat. Pick SKS93 Q&T 58-61 HRC when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SKS93 Q&T 54-58 HRC and SKS93 Q&T 58-61 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.