Steel G20Mo5 +A vs G20Mo5 +QT
Steel · G20Mo5 temper comparison
G20Mo5 +A and G20Mo5 +QT are two conditions of the same steel grade, G20Mo5: +A (annealed) 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 250 MPa (36.3 ksi) for G20Mo5 +A, about 32% more; tensile strength follows at 550 MPa (79.8 ksi) vs 460 MPa (66.7 ksi). In exchange, G20Mo5 +A is the more ductile: elongation 28% versus 23% for G20Mo5 +QT, and G20Mo5 +QT is harder (170 HB vs 135 HB).
G20Mo5 +AChoose it when the part is bent, formed or impact-loaded.
G20Mo5 +QTChoose it when strength drives the design.
G20Mo5 +A 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
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
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.
Thermal Conductivity
Min Service Temperature
Same in both: 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.
Electrical Resistivity
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 %)
Weldability
Formability (cold)
Same in both: 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 +A vs G20Mo5 +QT — frequently asked
Is G20Mo5 +QT stronger than G20Mo5 +A?
Yes. G20Mo5 +QT has a typical yield strength of 330 MPa (47.9 ksi) against 250 MPa (36.3 ksi) for G20Mo5 +A — about 32% more. Tensile strength is 550 MPa (79.8 ksi) vs 460 MPa (66.7 ksi).
Which condition does FabDigit quote by default, +A or +QT?
+N+T is the default G20Mo5 condition in the FabDigit quote flow (neither +A nor +QT). 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 +A over G20Mo5 +QT?
Pick G20Mo5 +A when the part is bent, formed or impact-loaded. Pick G20Mo5 +QT when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in G20Mo5 +A 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.