Aluminum 3B21-H112 vs 3B21-H34
Aluminum · 3B21 temper comparison
3B21-H112 and 3B21-H34 are two conditions of the same aluminum grade, 3B21: H112 (strain hardened from hot working only) versus H34 (strain hardened and stabilized, half hard). The chemistry is identical, so every difference below comes from the condition. 3B21-H34 is the stronger of the two: yield strength 145 MPa (21 ksi) against 65 MPa (9.43 ksi) for 3B21-H112, about 123% more; tensile strength follows at 175 MPa (25.4 ksi) vs 145 MPa (21 ksi). In exchange, 3B21-H112 is the more ductile: elongation 18% versus 10% for 3B21-H34, and 3B21-H34 is harder (44 HB vs 33 HB). 3B21-H112 runs hotter in service (180°C vs 150°C continuous).
3B21-H112Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
3B21-H34Choose it when strength drives the design.
3B21-H112 vs 3B21-H34: 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)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 69 GPa10 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.73 g/cm³0.1 lb/in³ · Melting Point (Solidus) 643°C1,189 °F · Liquidus Temperature 654°C1,209 °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 893 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.2 µm/m·K12.9 µin/in·°F · Latent Heat of Fusion 393 J/g169 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.83 V
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: Brazeability / Solderability 70 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 35%
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.
3B21-H112 vs 3B21-H34 — frequently asked
Is 3B21-H34 stronger than 3B21-H112?
Yes. 3B21-H34 has a typical yield strength of 145 MPa (21 ksi) against 65 MPa (9.43 ksi) for 3B21-H112 — about 123% more. Tensile strength is 175 MPa (25.4 ksi) vs 145 MPa (21 ksi).
Which condition does FabDigit quote by default, H112 or H34?
H14 is the default 3B21 condition in the FabDigit quote flow (neither H112 nor H34). 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 3B21-H112 over 3B21-H34?
Pick 3B21-H112 when the part is bent, formed or impact-loaded, or when the part sees heat. Pick 3B21-H34 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 3B21-H112 and 3B21-H34 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.