Steel G20Mo5 +N+T vs G20Mo5 +QT
Steel · G20Mo5 temper comparison
G20Mo5 +N+T and G20Mo5 +QT are two conditions of the same steel grade, G20Mo5: +N+T (normalized and tempered) versus +QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. G20Mo5 +QT is the stronger of the two: yield strength 330 MPa (47.9 ksi) against 285 MPa (41.3 ksi) for G20Mo5 +N+T, about 16% more; tensile strength follows at 550 MPa (79.8 ksi) vs 510 MPa (74 ksi). G20Mo5 +QT is harder — 170 HB against 150 HB for G20Mo5 +N+T — which matters for wear surfaces and threads.
G20Mo5 +QTChoose it when strength drives the design, or when surface hardness matters.
G20Mo5 +N+T vs G20Mo5 +QT: 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 B
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 285 MPa41.3 ksi · Shear Strength 330 MPa47.9 ksi · Fracture Toughness (K_IC) 95 MPa·√m86.5 ksi·√in · Hardness, Vickers 158 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,505°C2,741 °F
Thermal
How each material carries heat and how hot it can run.
Min Service Temperature
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 465 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 270 J/g116 BTU/lb · Max Service Temperature (continuous) 450°C842 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2×10⁻⁷ Ω·m7.87 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 Rating (AISI 1212 = 100 %)
Same in both: Machinability 58 / 100 · Weldability 70 / 100 · Formability (cold) 15 / 100 · Castability 68 / 100 · Brazeability / Solderability 45 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 27 MJ/kg11,608 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 75%
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.
G20Mo5 +N+T vs G20Mo5 +QT — frequently asked
Is G20Mo5 +QT stronger than G20Mo5 +N+T?
Yes. G20Mo5 +QT has a typical yield strength of 330 MPa (47.9 ksi) against 285 MPa (41.3 ksi) for G20Mo5 +N+T — about 16% more. Tensile strength is 550 MPa (79.8 ksi) vs 510 MPa (74 ksi).
Which condition does FabDigit quote by default, +N+T or +QT?
+N+T is the default G20Mo5 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.
When should I choose G20Mo5 +N+T over G20Mo5 +QT?
Pick G20Mo5 +QT when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in G20Mo5 +N+T and G20Mo5 +QT 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.