Steel 50100-HR vs 50100 QT58-62
Steel · 50100 temper comparison
50100-HR and 50100 QT58-62 are two conditions of the same steel grade, 50100: HR (hot rolled) versus QT58-62 (through hardened & tempered 58–62 HRC). The chemistry is identical, so every difference below comes from the condition. 50100 QT58-62 is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 490 MPa (71.1 ksi) for 50100-HR, about 3.7 times as much; tensile strength follows at 2,150 MPa (312 ksi) vs 850 MPa (123 ksi). In exchange, 50100-HR is the more ductile: elongation 14% versus 1.5% for 50100 QT58-62, and 50100-HR is harder (255 HB vs 195 HB). 50100-HR runs hotter in service (150°C vs 130°C continuous). On the shop floor, 50100-HR machines more easily (poor vs not recommended).
50100-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
50100 QT58-62Choose it when strength drives the design.
50100-HR vs 50100 QT58-62: 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °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 46 W/m·K26.6 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 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 12 / 100 · Brazeability / Solderability 40 / 100 · Polishability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 25%
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.
50100-HR vs 50100 QT58-62 — frequently asked
Is 50100 QT58-62 stronger than 50100-HR?
Yes. 50100 QT58-62 has a typical yield strength of 1,800 MPa (261 ksi) against 490 MPa (71.1 ksi) for 50100-HR — about 3.7 times as much. Tensile strength is 2,150 MPa (312 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, HR or QT58-62?
ANN is the default 50100 condition in the FabDigit quote flow (neither HR nor QT58-62). 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, 50100-HR or 50100 QT58-62?
50100-HR. Its machinability rates poor (33/100) against not recommended (9/100) for 50100 QT58-62.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 50100-HR and 50100 QT58-62 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.