Steel SCr445-A vs SCr445 QT 28-32 HRC
Steel · SCr445 temper comparison
SCr445-A and SCr445 QT 28-32 HRC are two conditions of the same steel grade, SCr445: A (solution annealed) versus QT 28-32 HRC. The chemistry is identical, so every difference below comes from the condition. SCr445 QT 28-32 HRC is the stronger of the two: yield strength 810 MPa (117 ksi) against 400 MPa (58 ksi) for SCr445-A, about 102% more; tensile strength follows at 980 MPa (142 ksi) vs 700 MPa (102 ksi). In exchange, SCr445-A is the more ductile: elongation 22% versus 16% for SCr445 QT 28-32 HRC, and SCr445 QT 28-32 HRC is harder (285 HB vs 197 HB). SCr445 QT 28-32 HRC runs hotter in service (400°C vs 350°C continuous).
SCr445-AChoose it when the part is bent, formed or impact-loaded.
SCr445 QT 28-32 HRCChoose it when strength drives the design, or when the part sees heat.
SCr445-A vs SCr445 QT 28-32 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
Compressive Strength
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 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 50%
Physical
Density and transition temperatures.
Same in both: Density 7.83 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 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 475 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 · Min Service Temperature -25°C-13 °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 12 / 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 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.1 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.
SCr445-A vs SCr445 QT 28-32 HRC — frequently asked
Is SCr445 QT 28-32 HRC stronger than SCr445-A?
Yes. SCr445 QT 28-32 HRC has a typical yield strength of 810 MPa (117 ksi) against 400 MPa (58 ksi) for SCr445-A — about 102% more. Tensile strength is 980 MPa (142 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, A or QT 28-32 HRC?
QT is the default SCr445 condition in the FabDigit quote flow (neither A nor QT 28-32 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, SCr445-A or SCr445 QT 28-32 HRC?
SCr445-A. Its machinability rates good (55/100) against fair (46/100) for SCr445 QT 28-32 HRC; for welding the order is SCr445-A first (poor, 30/100) then SCr445 QT 28-32 HRC (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SCr445-A and SCr445 QT 28-32 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.