Steel T7A-CD vs T7A-N
Steel · T7A temper comparison
T7A-CD and T7A-N are two conditions of the same steel grade, T7A: CD (cold drawn) versus N (normalized). The chemistry is identical, so every difference below comes from the condition. T7A-CD is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 450 MPa (65.3 ksi) for T7A-N, about 27% more. In exchange, T7A-N is the more ductile: elongation 14% versus 10% for T7A-CD, and T7A-N is harder (240 HB vs 210 HB). On the shop floor, T7A-CD machines more easily (good vs fair).
T7A-CDChoose it when strength drives the design, or when the part is machined in volume.
T7A-NChoose it when the part is bent, formed or impact-loaded.
T7A-CD vs T7A-N: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 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 7.83 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
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
Same in both: Formability (cold) 25 / 100 · Castability 30 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
T7A-CD vs T7A-N — frequently asked
Is T7A-CD stronger than T7A-N?
Yes. T7A-CD has a typical yield strength of 570 MPa (82.7 ksi) against 450 MPa (65.3 ksi) for T7A-N — about 27% more. Tensile strength is 750 MPa (109 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, CD or N?
A is the default T7A condition in the FabDigit quote flow (neither CD nor N). 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, T7A-CD or T7A-N?
T7A-CD. Its machinability rates good (58/100) against fair (46/100) for T7A-N; for welding the order is T7A-CD first (poor, 20/100) then T7A-N (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in T7A-CD and T7A-N 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.