Steel 33NiCrMoV14-5 +A vs 33NiCrMoV14-5 +QT900
Steel · 33NiCrMoV14-5 temper comparison
33NiCrMoV14-5 +A and 33NiCrMoV14-5 +QT900 are two conditions of the same steel grade, 33NiCrMoV14-5: +A (annealed) versus +QT900 (quenched and tempered, Rm 900–1100 MPa). The chemistry is identical, so every difference below comes from the condition. 33NiCrMoV14-5 +QT900 is the stronger of the two: yield strength 800 MPa (116 ksi) against 550 MPa (79.8 ksi) for 33NiCrMoV14-5 +A, about 45% more; tensile strength follows at 980 MPa (142 ksi) vs 850 MPa (123 ksi). In exchange, 33NiCrMoV14-5 +A is the more ductile: elongation 18% versus 16% for 33NiCrMoV14-5 +QT900, and 33NiCrMoV14-5 +QT900 is harder (300 HB vs 250 HB).
33NiCrMoV14-5 +AChoose it when the part is bent, formed or impact-loaded.
33NiCrMoV14-5 +QT900Choose it when strength drives the design.
33NiCrMoV14-5 +A vs 33NiCrMoV14-5 +QT900: 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.
33NiCrMoV14-5 +A33NiCrMoV14-5 +QT900
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 C
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 · Fracture Toughness (K_IC) 120 MPa·√m109 ksi·√in
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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 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 270 J/g116 BTU/lb · Min Service Temperature -80°C-112 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 13 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: 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) 2.5 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.
33NiCrMoV14-5 +A vs 33NiCrMoV14-5 +QT900 — frequently asked
Is 33NiCrMoV14-5 +QT900 stronger than 33NiCrMoV14-5 +A?
Yes. 33NiCrMoV14-5 +QT900 has a typical yield strength of 800 MPa (116 ksi) against 550 MPa (79.8 ksi) for 33NiCrMoV14-5 +A — about 45% more. Tensile strength is 980 MPa (142 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, +A or +QT900?
+QT is the default 33NiCrMoV14-5 condition in the FabDigit quote flow (neither +A nor +QT900). 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, 33NiCrMoV14-5 +A or 33NiCrMoV14-5 +QT900?
33NiCrMoV14-5 +A, by a small margin. Both rate fair for machinability — 45/100 against 38/100 for 33NiCrMoV14-5 +QT900; for welding the order is 33NiCrMoV14-5 +A first (poor, 28/100) then 33NiCrMoV14-5 +QT900 (poor, 22/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 33NiCrMoV14-5 +A and 33NiCrMoV14-5 +QT900 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.