Steel 94B15-HR vs 94B15 QT-28-32HRC
Steel · 94B15 temper comparison
94B15-HR and 94B15 QT-28-32HRC are two conditions of the same steel grade, 94B15: HR (hot rolled) versus QT-28-32HRC. The chemistry is identical, so every difference below comes from the condition. 94B15 QT-28-32HRC is the stronger of the two: yield strength 790 MPa (115 ksi) against 360 MPa (52.2 ksi) for 94B15-HR, about 119% more; tensile strength follows at 950 MPa (138 ksi) vs 545 MPa (79 ksi). In exchange, 94B15-HR is the more ductile: elongation 24% versus 17% for 94B15 QT-28-32HRC, and 94B15 QT-28-32HRC is harder (290 HB vs 156 HB). On the shop floor, 94B15-HR machines more easily (good vs fair) and 94B15-HR welds better (good vs fair).
94B15-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
94B15 QT-28-32HRCChoose it when strength drives the design.
94B15-HR vs 94B15 QT-28-32HRC: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 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 10 / 100
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 65 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 40 L/kg4.8 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.
94B15-HR vs 94B15 QT-28-32HRC — frequently asked
Is 94B15 QT-28-32HRC stronger than 94B15-HR?
Yes. 94B15 QT-28-32HRC has a typical yield strength of 790 MPa (115 ksi) against 360 MPa (52.2 ksi) for 94B15-HR — about 119% more. Tensile strength is 950 MPa (138 ksi) vs 545 MPa (79 ksi).
Which condition does FabDigit quote by default, HR or QT-28-32HRC?
ANN is the default 94B15 condition in the FabDigit quote flow (neither HR nor QT-28-32HRC). 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, 94B15-HR or 94B15 QT-28-32HRC?
94B15-HR. Its machinability rates good (58/100) against fair (47/100) for 94B15 QT-28-32HRC; for welding the order is 94B15-HR first (good, 58/100) then 94B15 QT-28-32HRC (fair, 38/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 94B15-HR and 94B15 QT-28-32HRC 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.