Steel SNCM447-CD vs SNCM447 QT-40-44HRC
Steel · SNCM447 temper comparison
SNCM447-CD and SNCM447 QT-40-44HRC are two conditions of the same steel grade, SNCM447: CD (cold drawn) versus QT-40-44HRC. The chemistry is identical, so every difference below comes from the condition. SNCM447 QT-40-44HRC is the stronger of the two: yield strength 1,280 MPa (186 ksi) against 730 MPa (106 ksi) for SNCM447-CD, about 75% more; tensile strength follows at 1,400 MPa (203 ksi) vs 880 MPa (128 ksi). SNCM447 QT-40-44HRC is harder — 400 HB against 255 HB for SNCM447-CD — which matters for wear surfaces and threads. SNCM447-CD runs hotter in service (400°C vs 330°C continuous). On the shop floor, SNCM447-CD machines more easily (52 vs 42 out of 100).
SNCM447-CDChoose it when the part sees heat, or when the part is machined in volume.
SNCM447 QT-40-44HRCChoose it when strength drives the design, or when surface hardness matters.
SNCM447-CD vs SNCM447 QT-40-44HRC: 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 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
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 1,490°C2,714 °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 475 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 7 % IACS
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
Same in both: Formability (cold) 25 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 25%
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.
SNCM447-CD vs SNCM447 QT-40-44HRC — frequently asked
Is SNCM447 QT-40-44HRC stronger than SNCM447-CD?
Yes. SNCM447 QT-40-44HRC has a typical yield strength of 1,280 MPa (186 ksi) against 730 MPa (106 ksi) for SNCM447-CD — about 75% more. Tensile strength is 1,400 MPa (203 ksi) vs 880 MPa (128 ksi).
Which condition does FabDigit quote by default, CD or QT-40-44HRC?
QT-JIS is the default SNCM447 condition in the FabDigit quote flow (neither CD nor QT-40-44HRC). 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, SNCM447-CD or SNCM447 QT-40-44HRC?
SNCM447-CD, by a small margin. Both rate fair for machinability — 52/100 against 42/100 for SNCM447 QT-40-44HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SNCM447-CD and SNCM447 QT-40-44HRC 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.