Aluminum EN AC-51000 K-F vs EN AC-51000-O
Aluminum · EN AC-51000 temper comparison
EN AC-51000 K-F and EN AC-51000-O are two conditions of the same aluminum grade, EN AC-51000: K-F (permanent mould (chill) cast, as-cast) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. EN AC-51000 K-F is the stronger of the two: yield strength 75 MPa (10.9 ksi) against 65 MPa (9.43 ksi) for EN AC-51000-O, about 15% more; tensile strength follows at 155 MPa (22.5 ksi) vs 140 MPa (20.3 ksi). EN AC-51000 K-F is harder — 50 HB against 46 HB for EN AC-51000-O — which matters for wear surfaces and threads.
EN AC-51000 K-FChoose it when strength drives the design, or when surface hardness matters.
EN AC-51000 K-F vs EN AC-51000-O: 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)
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 70 GPa10.2 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33 · Elongation at Break 5% · Fracture Toughness (K_IC) 24 MPa·√m21.8 ksi·√in · Charpy V-Notch Impact (RT) 12 J8.9 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 2.66 g/cm³0.1 lb/in³ · Melting Point (Solidus) 610°C1,130 °F · Liquidus Temperature 640°C1,184 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.5 µm/m·K13.1 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 120°C248 °F · 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) -0.87 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: Castability 40 / 100 · Brazeability / Solderability 15 / 100 · Polishability 82 / 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 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 50%
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.
EN AC-51000 K-F vs EN AC-51000-O — frequently asked
Is EN AC-51000 K-F stronger than EN AC-51000-O?
Yes. EN AC-51000 K-F has a typical yield strength of 75 MPa (10.9 ksi) against 65 MPa (9.43 ksi) for EN AC-51000-O — about 15% more. Tensile strength is 155 MPa (22.5 ksi) vs 140 MPa (20.3 ksi).
Which condition does FabDigit quote by default, K-F or O?
S-F is the default EN AC-51000 condition in the FabDigit quote flow (neither K-F nor O). 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 EN AC-51000 K-F over EN AC-51000-O?
Pick EN AC-51000 K-F when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EN AC-51000 K-F and EN AC-51000-O 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.