Steel SNCM616-CD vs SNCM616-CH
Steel · SNCM616 temper comparison
SNCM616-CD and SNCM616-CH are two conditions of the same steel grade, SNCM616: CD (cold drawn) versus CH (carburized and hardened). The chemistry is identical, so every difference below comes from the condition. SNCM616-CH is the stronger of the two: yield strength 1,010 MPa (146 ksi) against 660 MPa (95.7 ksi) for SNCM616-CD, about 53% more; tensile strength follows at 1,250 MPa (181 ksi) vs 820 MPa (119 ksi). SNCM616-CH is the more ductile: elongation 14% versus 12% for SNCM616-CD, and SNCM616-CH is harder (375 HB vs 245 HB). SNCM616-CD runs hotter in service (300°C vs 180°C continuous). On the shop floor, SNCM616-CD machines more easily (fair vs not recommended) and SNCM616-CD welds better (poor vs not recommended).
SNCM616-CDChoose it when the part sees heat, or when the part is machined in volume.
SNCM616-CHChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
SNCM616-CD vs SNCM616-CH: 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 45% · Hardness, Rockwell B 94 HRB
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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 35 W/m·K20.2 BTU/hr·ft·°F · Specific Heat Capacity 470 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 270 J/g116 BTU/lb · Min Service Temperature -80°C-112 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 14 / 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 50 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.4 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.
SNCM616-CD vs SNCM616-CH — frequently asked
Is SNCM616-CH stronger than SNCM616-CD?
Yes. SNCM616-CH has a typical yield strength of 1,010 MPa (146 ksi) against 660 MPa (95.7 ksi) for SNCM616-CD — about 53% more. Tensile strength is 1,250 MPa (181 ksi) vs 820 MPa (119 ksi).
Which condition does FabDigit quote by default, CD or CH?
A is the default SNCM616 condition in the FabDigit quote flow (neither CD nor CH). 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, SNCM616-CD or SNCM616-CH?
SNCM616-CD. Its machinability rates fair (50/100) against not recommended (8/100) for SNCM616-CH; for welding the order is SNCM616-CD first (poor, 20/100) then SNCM616-CH (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SNCM616-CD and SNCM616-CH 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.