Steel 35NiCrMo16 +A vs 35NiCrMo16 QT-1850
Steel · 35NiCrMo16 temper comparison
35NiCrMo16 +A and 35NiCrMo16 QT-1850 are two conditions of the same steel grade, 35NiCrMo16: +A (annealed) versus QT-1850 (Q&T 1800–2000 MPa). The chemistry is identical, so every difference below comes from the condition. 35NiCrMo16 QT-1850 is the stronger of the two: yield strength 1,650 MPa (239 ksi) against 620 MPa (89.9 ksi) for 35NiCrMo16 +A, about 166% more; tensile strength follows at 1,900 MPa (276 ksi) vs 900 MPa (131 ksi). In exchange, 35NiCrMo16 +A is the more ductile: elongation 16% versus 7% for 35NiCrMo16 QT-1850, and 35NiCrMo16 QT-1850 is harder (400 HB vs 265 HB). 35NiCrMo16 +A runs hotter in service (400°C vs 250°C continuous). On the shop floor, 35NiCrMo16 +A machines more easily (fair vs not recommended).
35NiCrMo16 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
35NiCrMo16 QT-1850Choose it when strength drives the design.
35NiCrMo16 +A vs 35NiCrMo16 QT-1850: 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.
35NiCrMo16 +A35NiCrMo16 QT-1850
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 1,200 MPa174 ksi · Shear Strength 810 MPa117 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 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 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 Resistivity 3×10⁻⁷ Ω·m11.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 12 / 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 15 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 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.
35NiCrMo16 +A vs 35NiCrMo16 QT-1850 — frequently asked
Is 35NiCrMo16 QT-1850 stronger than 35NiCrMo16 +A?
Yes. 35NiCrMo16 QT-1850 has a typical yield strength of 1,650 MPa (239 ksi) against 620 MPa (89.9 ksi) for 35NiCrMo16 +A — about 166% more. Tensile strength is 1,900 MPa (276 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, +A or QT-1850?
+QT-1250 is the default 35NiCrMo16 condition in the FabDigit quote flow (neither +A nor QT-1850). 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, 35NiCrMo16 +A or 35NiCrMo16 QT-1850?
35NiCrMo16 +A. Its machinability rates fair (45/100) against not recommended (12/100) for 35NiCrMo16 QT-1850.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 35NiCrMo16 +A and 35NiCrMo16 QT-1850 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.