Steel S30C-IH vs S30C-QT600
Steel · S30C temper comparison
S30C-IH and S30C-QT600 are two conditions of the same steel grade, S30C: IH (induction hardened) versus QT600 (Q&T). The chemistry is identical, so every difference below comes from the condition. S30C-QT600 is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 330 MPa (47.9 ksi) for S30C-IH, about 42% more; tensile strength follows at 650 MPa (94.3 ksi) vs 520 MPa (75.4 ksi). S30C-IH is harder — 480 HB against 195 HB for S30C-QT600 — which matters for wear surfaces and threads. S30C-QT600 runs hotter in service (400°C vs 180°C continuous). On the shop floor, S30C-QT600 machines more easily (good vs poor), S30C-QT600 welds better (good vs poor), and S30C-QT600 forms better (fair vs not recommended).
S30C-IHChoose it when surface hardness matters.
S30C-QT600Choose it when strength drives the design, or when the part sees heat.
S30C-IH vs S30C-QT600: 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
Compressive Strength
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
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 1,510°C2,750 °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 486 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 260 J/g112 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) -0.61 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 %)
Weldability
Formability (cold)
Same in both: Castability 40 / 100 · Brazeability / Solderability 70 / 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) 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.
S30C-IH vs S30C-QT600 — frequently asked
Is S30C-QT600 stronger than S30C-IH?
Yes. S30C-QT600 has a typical yield strength of 470 MPa (68.2 ksi) against 330 MPa (47.9 ksi) for S30C-IH — about 42% more. Tensile strength is 650 MPa (94.3 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, IH or QT600?
N is the default S30C condition in the FabDigit quote flow (neither IH nor QT600). 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, S30C-IH or S30C-QT600?
S30C-QT600. Its machinability rates good (58/100) against poor (20/100) for S30C-IH; for welding the order is S30C-QT600 first (good, 65/100) then S30C-IH (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S30C-IH and S30C-QT600 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.