Steel 30NiCrMo16-QT1080 vs 30NiCrMo16-QT1250
Steel · 30NiCrMo16 temper comparison
30NiCrMo16-QT1080 and 30NiCrMo16-QT1250 are two conditions of the same steel grade, 30NiCrMo16: QT1080 (+QT 1080–1230 MPa) versus QT1250 (Q&T 1240–1420 MPa). The chemistry is identical, so every difference below comes from the condition. 30NiCrMo16-QT1250 is the stronger of the two: yield strength 1,200 MPa (174 ksi) against 980 MPa (142 ksi) for 30NiCrMo16-QT1080, about 22% more; tensile strength follows at 1,350 MPa (196 ksi) vs 1,150 MPa (167 ksi). 30NiCrMo16-QT1250 is the more ductile: elongation 14% versus 12% for 30NiCrMo16-QT1080, and 30NiCrMo16-QT1250 is harder (390 HB vs 350 HB). 30NiCrMo16-QT1080 runs hotter in service (400°C vs 350°C continuous).
30NiCrMo16-QT1080Choose it when the part sees heat.
30NiCrMo16-QT1250Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
30NiCrMo16-QT1080 vs 30NiCrMo16-QT1250: 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.
30NiCrMo16-QT108030NiCrMo16-QT1250
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)
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 1,680 MPa244 ksi · Shear Strength 1,120 MPa162 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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 33 W/m·K19.1 BTU/hr·ft·°F · Specific Heat Capacity 470 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 -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.8 % 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 %)
Same in both: Weldability 15 / 100 · Formability (cold) 8 / 100 · Brazeability / Solderability 35 / 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 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.
30NiCrMo16-QT1080 vs 30NiCrMo16-QT1250 — frequently asked
Is 30NiCrMo16-QT1250 stronger than 30NiCrMo16-QT1080?
Yes. 30NiCrMo16-QT1250 has a typical yield strength of 1,200 MPa (174 ksi) against 980 MPa (142 ksi) for 30NiCrMo16-QT1080 — about 22% more. Tensile strength is 1,350 MPa (196 ksi) vs 1,150 MPa (167 ksi).
Which condition does FabDigit quote by default, QT1080 or QT1250?
QT1800 is the default 30NiCrMo16 condition in the FabDigit quote flow (neither QT1080 nor QT1250). 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, 30NiCrMo16-QT1080 or 30NiCrMo16-QT1250?
30NiCrMo16-QT1080, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for 30NiCrMo16-QT1250.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 30NiCrMo16-QT1080 and 30NiCrMo16-QT1250 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.