Aluminum 2198-T3 vs 2198-T8
Aluminum · 2198 temper comparison
2198-T3 and 2198-T8 are two conditions of the same aluminum grade, 2198: T3 (solution heat treated, cold worked and naturally aged) versus T8 (solution heat treated, cold worked and artificially aged). The chemistry is identical, so every difference below comes from the condition. 2198-T8 is the stronger of the two: yield strength 430 MPa (62.4 ksi) against 270 MPa (39.2 ksi) for 2198-T3, about 59% more; tensile strength follows at 480 MPa (69.6 ksi) vs 395 MPa (57.3 ksi). In exchange, 2198-T3 is the more ductile: elongation 20% versus 11% for 2198-T8, and 2198-T8 is harder (145 HB vs 110 HB). 2198-T8 runs hotter in service (120°C vs 90°C continuous) and 2198-T8 conducts heat better (100 W/m·K vs 85 W/m·K).
2198-T3Choose it when the part is bent, formed or impact-loaded.
2198-T8Choose it when strength drives the design, or when the part sees heat.
2198-T3 vs 2198-T8: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all aluminum 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 aluminum 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 76 GPa11 Msi · Shear Modulus 29 GPa4.2 Msi · Bulk Modulus 74 GPa10.7 Msi · Poisson's Ratio 0.33 · Compressive Strength 440 MPa63.8 ksi · Hardness, Rockwell B 80 HRB · Hardness, Vickers 155 HV
Physical
Density and transition temperatures.
Same in both: Density 2.7 g/cm³0.1 lb/in³ · Melting Point (Solidus) 560°C1,040 °F · Liquidus Temperature 645°C1,193 °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 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23 µm/m·K12.8 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 6.2×10⁻⁸ Ω·m2.44 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.73 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 55% · Weldability 30 / 100 · Castability 25 / 100 · Brazeability / Solderability 15 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 215 MJ/kg92,433 BTU/lb · Embodied Carbon (primary production) 13.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 5%
Strength versus weight
Yield strength against density for every aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
2198-T3 vs 2198-T8 — frequently asked
Is 2198-T8 stronger than 2198-T3?
Yes. 2198-T8 has a typical yield strength of 430 MPa (62.4 ksi) against 270 MPa (39.2 ksi) for 2198-T3 — about 59% more. Tensile strength is 480 MPa (69.6 ksi) vs 395 MPa (57.3 ksi).
Which condition does FabDigit quote by default, T3 or T8?
T8 is the default 2198 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, 2198-T3 or 2198-T8?
2198-T8, by a small margin. Both rate good for machinability — 60/100 against 55/100 for 2198-T3.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 2198-T3 and 2198-T8 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.