Steel 35NCD16-A vs 35NCD16-QT1790
Steel · 35NCD16 temper comparison
35NCD16-A and 35NCD16-QT1790 are two conditions of the same steel grade, 35NCD16: A (solution annealed) versus QT1790 (Q&T 1790–1980 MPa). The chemistry is identical, so every difference below comes from the condition. 35NCD16-QT1790 is the stronger of the two: yield strength 1,620 MPa (235 ksi) against 600 MPa (87 ksi) for 35NCD16-A, about 170% more; tensile strength follows at 1,900 MPa (276 ksi) vs 860 MPa (125 ksi). In exchange, 35NCD16-A is the more ductile: elongation 18% versus 11% for 35NCD16-QT1790, and 35NCD16-QT1790 is harder (530 HB vs 245 HB). 35NCD16-A runs hotter in service (400°C vs 200°C continuous). On the shop floor, 35NCD16-A machines more easily (fair vs poor).
35NCD16-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
35NCD16-QT1790Choose it when strength drives the design.
35NCD16-A vs 35NCD16-QT1790: 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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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 1,700 MPa247 ksi · Shear Strength 1,140 MPa165 ksi · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Hardness, Vickers 560 HV
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 35 W/m·K20.2 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -55°C-67 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.7 % IACS · Electrical Resistivity 3×10⁻⁷ Ω·m11.8 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 %)
Formability (cold)
Same in both: Weldability 20 / 100 · Brazeability / Solderability 40 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 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.
35NCD16-A vs 35NCD16-QT1790 — frequently asked
Is 35NCD16-QT1790 stronger than 35NCD16-A?
Yes. 35NCD16-QT1790 has a typical yield strength of 1,620 MPa (235 ksi) against 600 MPa (87 ksi) for 35NCD16-A — about 170% more. Tensile strength is 1,900 MPa (276 ksi) vs 860 MPa (125 ksi).
Which condition does FabDigit quote by default, A or QT1790?
QT1790 is the default 35NCD16 condition in the FabDigit quote flow. 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, 35NCD16-A or 35NCD16-QT1790?
35NCD16-A. Its machinability rates fair (45/100) against poor (25/100) for 35NCD16-QT1790.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 35NCD16-A and 35NCD16-QT1790 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.