Steel T13A-A vs T13A QT63-65
Steel · T13A temper comparison
T13A-A and T13A QT63-65 are two conditions of the same steel grade, T13A: A (solution annealed) versus QT63-65 (Q&T 63–65 HRC). The chemistry is identical, so every difference below comes from the condition. T13A QT63-65 is the stronger of the two: tensile strength 2,100 MPa (305 ksi) against 700 MPa (102 ksi) for T13A-A, about 3.0 times as much. In exchange, T13A-A is the more ductile: elongation 18% versus 0.5% for T13A QT63-65, and T13A QT63-65 is harder (800 HV vs 207 HV). T13A-A runs hotter in service (300°C vs 150°C continuous). On the shop floor, T13A-A machines more easily (fair vs not recommended).
T13A-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
T13A QT63-65Choose it when strength drives the design.
T13A-A vs T13A QT63-65: 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)
Elongation at Break
Compressive Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
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 · Yield Strength (0.2% offset) 420 MPa60.9 ksi · Reduction in Area 35% · Shear Strength 450 MPa65.3 ksi · Hardness, Brinell 197 HB · Hardness, Rockwell B 92 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 48 W/m·K27.7 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.3 µm/m·K6.3 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 9.5 % IACS · Electrical Resistivity 1.8×10⁻⁷ Ω·m7.09 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 10 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Polishability
Same in both: Weldability 12 / 100 · Formability (cold) 35 / 100 · Brazeability / Solderability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 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.
T13A-A vs T13A QT63-65 — frequently asked
Is T13A QT63-65 stronger than T13A-A?
Yes. T13A QT63-65 has a typical tensile strength of 2,100 MPa (305 ksi) against 700 MPa (102 ksi) for T13A-A — about 3.0 times as much.
Which condition does FabDigit quote by default, A or QT63-65?
A is the default T13A 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.
Which is easier to machine, T13A-A or T13A QT63-65?
T13A-A. Its machinability rates fair (40/100) against not recommended (8/100) for T13A QT63-65.
Ready to make it?
Upload a CAD file and FabDigit prices the part in T13A-A and T13A QT63-65 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.