Steel 30NCD16-QT1420 vs 30NCD16-QT1770
Steel · 30NCD16 temper comparison
30NCD16-QT1420 and 30NCD16-QT1770 are two conditions of the same steel grade, 30NCD16: QT1420 (Q&T 1420–1620 MPa) versus QT1770 (Q&T 1770–1960 MPa). The chemistry is identical, so every difference below comes from the condition. 30NCD16-QT1770 is the stronger of the two: yield strength 1,570 MPa (228 ksi) against 1,330 MPa (193 ksi) for 30NCD16-QT1420, about 18% more; tensile strength follows at 1,860 MPa (270 ksi) vs 1,520 MPa (220 ksi). In exchange, 30NCD16-QT1420 is the more ductile: elongation 10% versus 8% for 30NCD16-QT1770, and 30NCD16-QT1770 is harder (520 HB vs 440 HB). 30NCD16-QT1420 runs hotter in service (300°C vs 200°C continuous). On the shop floor, 30NCD16-QT1420 machines more easily (30 vs 20 out of 100).
30NCD16-QT1420Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
30NCD16-QT1770Choose it when strength drives the design.
30NCD16-QT1420 vs 30NCD16-QT1770: 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
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 · Compressive Strength 1,180 MPa171 ksi
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 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 33 W/m·K19.1 BTU/hr·ft·°F · Specific Heat Capacity 460 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 250 J/g107 BTU/lb · Min Service Temperature -60°C-76 °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 %)
Same in both: Weldability 25 / 100 · Formability (cold) 20 / 100 · Castability 35 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 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 20%
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.
30NCD16-QT1420 vs 30NCD16-QT1770 — frequently asked
Is 30NCD16-QT1770 stronger than 30NCD16-QT1420?
Yes. 30NCD16-QT1770 has a typical yield strength of 1,570 MPa (228 ksi) against 1,330 MPa (193 ksi) for 30NCD16-QT1420 — about 18% more. Tensile strength is 1,860 MPa (270 ksi) vs 1,520 MPa (220 ksi).
Which condition does FabDigit quote by default, QT1420 or QT1770?
QT1230 is the default 30NCD16 condition in the FabDigit quote flow (neither QT1420 nor QT1770). 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, 30NCD16-QT1420 or 30NCD16-QT1770?
30NCD16-QT1420, by a small margin. Both rate poor for machinability — 30/100 against 20/100 for 30NCD16-QT1770.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30NCD16-QT1420 and 30NCD16-QT1770 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.