Steel E470 QT-28-32HRC vs E470 QT-45-50HRC
Steel · E470 temper comparison
E470 QT-28-32HRC and E470 QT-45-50HRC are two conditions of the same steel grade, E470: QT-28-32HRC versus QT-45-50HRC. The chemistry is identical, so every difference below comes from the condition. E470 QT-45-50HRC is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 780 MPa (113 ksi) for E470 QT-28-32HRC, about 73% more; tensile strength follows at 1,550 MPa (225 ksi) vs 950 MPa (138 ksi). In exchange, E470 QT-28-32HRC is the more ductile: elongation 16% versus 8% for E470 QT-45-50HRC, and E470 QT-45-50HRC is harder (460 HB vs 285 HB). E470 QT-28-32HRC runs hotter in service (400°C vs 200°C continuous). On the shop floor, E470 QT-28-32HRC machines more easily (fair vs poor).
E470 QT-28-32HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
E470 QT-45-50HRCChoose it when strength drives the design.
E470 QT-28-32HRC vs E470 QT-45-50HRC: 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.
E470 QT-28-32HRCE470 QT-45-50HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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 · Compressive Strength 580 MPa84.1 ksi · Hardness, Rockwell B 96 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 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 48 W/m·K27.7 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 247 J/g106 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9.6 % IACS · Electrical Resistivity 1.8×10⁻⁷ Ω·m7.09 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 10 / 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 32 / 100 · Formability (cold) 25 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
E470 QT-28-32HRC vs E470 QT-45-50HRC — frequently asked
Is E470 QT-45-50HRC stronger than E470 QT-28-32HRC?
Yes. E470 QT-45-50HRC has a typical yield strength of 1,350 MPa (196 ksi) against 780 MPa (113 ksi) for E470 QT-28-32HRC — about 73% more. Tensile strength is 1,550 MPa (225 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, QT-28-32HRC or QT-45-50HRC?
+C is the default E470 condition in the FabDigit quote flow (neither QT-28-32HRC nor QT-45-50HRC). 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, E470 QT-28-32HRC or E470 QT-45-50HRC?
E470 QT-28-32HRC. Its machinability rates fair (45/100) against poor (24/100) for E470 QT-45-50HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E470 QT-28-32HRC and E470 QT-45-50HRC 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.