Steel 10G2S1-A vs 10G2S1-QT
Steel · 10G2S1 temper comparison
10G2S1-A and 10G2S1-QT are two conditions of the same steel grade, 10G2S1: A (solution annealed) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 10G2S1-QT is the stronger of the two: yield strength 440 MPa (63.8 ksi) against 305 MPa (44.2 ksi) for 10G2S1-A, about 44% more; tensile strength follows at 600 MPa (87 ksi) vs 460 MPa (66.7 ksi). In exchange, 10G2S1-A is the more ductile: elongation 28% versus 19% for 10G2S1-QT, and 10G2S1-QT is harder (200 HB vs 143 HB). On the shop floor, 10G2S1-A welds better (80 vs 70 out of 100).
10G2S1-AChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
10G2S1-QTChoose it when strength drives the design.
10G2S1-A vs 10G2S1-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
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 80 GPa11.6 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) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 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 %)
Weldability
Formability (cold)
Same in both: Castability 25 / 100 · Brazeability / Solderability 60 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
10G2S1-A vs 10G2S1-QT — frequently asked
Is 10G2S1-QT stronger than 10G2S1-A?
Yes. 10G2S1-QT has a typical yield strength of 440 MPa (63.8 ksi) against 305 MPa (44.2 ksi) for 10G2S1-A — about 44% more. Tensile strength is 600 MPa (87 ksi) vs 460 MPa (66.7 ksi).
Which condition does FabDigit quote by default, A or QT?
HR is the default 10G2S1 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.
Which is easier to machine, 10G2S1-A or 10G2S1-QT?
10G2S1-A, by a small margin. Both rate good for machinability — 60/100 against 55/100 for 10G2S1-QT; for welding the order is 10G2S1-A first (very good, 80/100) then 10G2S1-QT (very good, 70/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 10G2S1-A and 10G2S1-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.