Steel SCr430-HR vs SCr430 QT 28-32 HRC
Steel · SCr430 temper comparison
SCr430-HR and SCr430 QT 28-32 HRC are two conditions of the same steel grade, SCr430: HR (hot rolled) versus QT 28-32 HRC (Q&T to 28–32 HRC). The chemistry is identical, so every difference below comes from the condition. SCr430 QT 28-32 HRC is the stronger of the two: yield strength 830 MPa (120 ksi) against 380 MPa (55.1 ksi) for SCr430-HR, about 118% more; tensile strength follows at 960 MPa (139 ksi) vs 620 MPa (89.9 ksi). In exchange, SCr430-HR is the more ductile: elongation 24% versus 16% for SCr430 QT 28-32 HRC, and SCr430 QT 28-32 HRC is harder (293 HB vs 187 HB). On the shop floor, SCr430-HR welds better (50 vs 40 out of 100).
SCr430-HRChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
SCr430 QT 28-32 HRCChoose it when strength drives the design.
SCr430-HR vs SCr430 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)
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 · Reduction in Area 50% · Charpy V-Notch Impact (RT) 45 J33.2 ft·lbf
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 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: 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 · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -30°C-22 °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) -0.61 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 60 / 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) 1.9 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.
SCr430-HR vs SCr430 QT 28-32 HRC — frequently asked
Is SCr430 QT 28-32 HRC stronger than SCr430-HR?
Yes. SCr430 QT 28-32 HRC has a typical yield strength of 830 MPa (120 ksi) against 380 MPa (55.1 ksi) for SCr430-HR — about 118% more. Tensile strength is 960 MPa (139 ksi) vs 620 MPa (89.9 ksi).
Which condition does FabDigit quote by default, HR or QT 28-32 HRC?
QT is the default SCr430 condition in the FabDigit quote flow (neither HR 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 welds better, SCr430-HR or SCr430 QT 28-32 HRC?
SCr430-HR. Its weldability rates fair (50/100) against fair (40/100) for SCr430 QT 28-32 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SCr430-HR and SCr430 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.