Steel C35RC +H vs C35RC +QT
Steel · C35RC temper comparison
C35RC +H and C35RC +QT are two conditions of the same steel grade, C35RC: +H (hardenability-controlled, supplied hardened and tempered) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. C35RC +H is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 420 MPa (60.9 ksi) for C35RC +QT, about 48% more; tensile strength follows at 800 MPa (116 ksi) vs 660 MPa (95.7 ksi). In exchange, C35RC +QT is the more ductile: elongation 19% versus 15% for C35RC +H, and C35RC +H is harder (240 HB vs 200 HB). C35RC +QT runs hotter in service (400°C vs 250°C continuous). On the shop floor, C35RC +QT machines more easily (52 vs 42 out of 100) and C35RC +QT welds better (45 vs 35 out of 100).
C35RC +HChoose it when strength drives the design.
C35RC +QTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C35RC +H vs C35RC +QT: 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
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 300 MPa43.5 ksi
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 1,495°C2,723 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 477 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 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 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.63 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 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) 2.1 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 28%
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.
C35RC +H vs C35RC +QT — frequently asked
Is C35RC +H stronger than C35RC +QT?
Yes. C35RC +H has a typical yield strength of 620 MPa (89.9 ksi) against 420 MPa (60.9 ksi) for C35RC +QT — about 48% more. Tensile strength is 800 MPa (116 ksi) vs 660 MPa (95.7 ksi).
Which condition does FabDigit quote by default, +H or +QT?
+AC is the default C35RC condition in the FabDigit quote flow (neither +H nor +QT). 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, C35RC +H or C35RC +QT?
C35RC +QT, by a small margin. Both rate fair for machinability — 52/100 against 42/100 for C35RC +H; for welding the order is C35RC +QT first (fair, 45/100) then C35RC +H (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C35RC +H and C35RC +QT 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.