Aluminum AL2 F-PM
Finish state
Pick when faster solidification is available: finer eutectic gives ~15 % higher strength and better surface than sand casting.
Values for the F-PM condition
Other AL2 tempers and conditions
AL2 is listed in 4 conditions; see the grade overview at AL2.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cooled from hot working, cold worked and naturally aged | Choose for dimensionally stable, machining-friendly castings: relieves casting stresses and raises ductility at a small strength cost. | 70 | 145 | 7 | 48 HB | 33 % IACS |
F-SDefault F | Default for general sand-cast housings, covers, pump and fitting bodies where pressure tightness and corrosion resistance matter more than strength. | 75 | 150 | 5 | 50 HB | 31 % IACS |
F-PMThis page F | Pick when faster solidification is available: finer eutectic gives ~15 % higher strength and better surface than sand casting. | 85 | 170 | 4 | 55 HB | 32 % IACS |
F | Highest strength form of this chemistry — thin chilled skin nearly doubles UTS; use for thin-wall pressure-tight die castings, but never solution treat (blistering). | 145 | 290 | 2.5 | 80 HB | 31 % IACS |
What is AL2 F-PM?
AL2 F-PM is AL2 supplied in the F-PM condition — pick when faster solidification is available: finer eutectic gives ~15 % higher strength and better surface than sand casting. AL2 F-PM has a yield strength of 85 MPa (12.3 ksi) and a tensile strength of 170 MPa (24.7 ksi) — weaker than 88% of aluminum grades. Elongation at break is 4% and the elastic modulus is 71 GPa (10.3 Msi). AL2 F-PM has a density of 2.65 g/cm³ (0.0957 lb/in³), lighter than 90% of aluminum grades. It melts at 574°C (1,065 °F). F-S is the default condition FabDigit quotes; F-PM is available on request or by drawing note.
Limitations
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Limited formability — 6/100, worse than 89% of aluminum grades
- Low strength — 85 MPa (12.3 ksi), worse than 88% of aluminum grades
- Difficult to machine — 33/100, worse than 87% of aluminum grades
- Poor heat conductor — 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades
AL2 F-PM properties
Typical room-temperature values for AL2 F-PM; 22 are specific to this condition. Other listed values are AL2 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
AL2 F-PM has a density of 2.65 g/cm³ (0.0957 lb/in³), lighter than 90% of aluminum grades. It melts at 574°C (1,065 °F).
Mechanical12
AL2 F-PM has a yield strength of 85 MPa (12.3 ksi) and a tensile strength of 170 MPa (24.7 ksi) — weaker than 88% of aluminum grades. Elongation at break is 4% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
AL2 F-PM is rated for continuous service to 150°C (302 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades. Thermal expansion is 20.4 µm/m·K (11.3 µin/in·°F).
Electrical3
AL2 F-PM conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 70% of aluminum grades.
Sustainability4
Producing a kilogram of AL2 F-PM takes about 200 MJ of energy and emits 11.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 80%.
Manufacturability8
AL2 F-PM's machinability is poor (33/100, worse than 87% of aluminum grades); weldability very good (80/100); formability not recommended (6/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with AL2 F-PM
Is AL2 easy to machine?
Abrasive eutectic silicon — use PCD or polished-flute carbide, high speed, light feed, flood coolant; expect built-up edge with HSS.
Can AL2 be welded?
Readily TIG/MIG welded and weld-repaired with ER4047/ER4043; preheat 150–200 °C on heavy sections; do not weld porous high-pressure die castings.
Can AL2 be formed, bent or molded?
Casting alloy only — outstanding fluidity and low hot-tearing, suited to thin walls in sand, permanent-mould and high-pressure die casting; Na or Sr modification refines eutectic and doubles elongation.
What surface finishes work on AL2?
Best protected by chromate/Ti-Zr conversion coating plus paint or powder coat; decorative anodizing gives a dark grey, blotchy film; hard anodize only where appearance is unimportant.
AL2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Sieutectic former; Na/Sr modified for ductility | 10 – 13 | 11.5 |
| Fe≤1.5 % permitted for pressure die castings | ≤ 1 | 0.5 |
| Cukeep low for corrosion resistance | ≤ 0.6 | 0.2 |
| Mn | ≤ 0.5 | 0.2 |
| Mgnot heat-treatable at this level | ≤ 0.1 | 0.05 |
| Zn | ≤ 0.3 | 0.1 |
| Tigrain refinement | ≤ 0.1 | 0.05 |
| Other, eachtotal impurities ≤ 2.7 % per ГОСТ 1583 | ≤ 0.15 | — |
| Al | balance | — |
AL2 F-PM — frequently asked
What is AL2 F-PM used for?
AL2 F-PM is typically used for housings and covers, marine fittings, thin-wall die castings, pump and blower casings, electrical enclosures and instrument bases and frames. In short: most castable Al-Si alloy; low strength, high corrosion resistance; abrasive to cutting tools.
What is the yield strength of AL2 F-PM?
AL2 F-PM has a typical yield strength of 85 MPa (12.3 ksi) and a tensile strength of 170 MPa (24.7 ksi) — weaker than 88% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is AL2 F-PM easy to machine?
Not especially — machinability is rated poor (33/100, worse than 87% of aluminum grades). Abrasive eutectic silicon — use PCD or polished-flute carbide, high speed, light feed, flood coolant; expect built-up edge with HSS.
Can AL2 F-PM be welded?
Yes — weldability is rated very good (80/100). Readily TIG/MIG welded and weld-repaired with ER4047/ER4043; preheat 150–200 °C on heavy sections; do not weld porous high-pressure die castings.
What surface finishes work on AL2 F-PM?
Best protected by chromate/Ti-Zr conversion coating plus paint or powder coat; decorative anodizing gives a dark grey, blotchy film; hard anodize only where appearance is unimportant.
Can AL2 F-PM be formed, bent or molded?
Casting alloy only — outstanding fluidity and low hot-tearing, suited to thin walls in sand, permanent-mould and high-pressure die casting; Na or Sr modification refines eutectic and doubles elongation.
What is the maximum service temperature of AL2 F-PM?
AL2 F-PM is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AL2 F-S and AL2 F-DC?
F-S is the default condition — default for general sand-cast housings, covers, pump and fitting bodies where pressure tightness and corrosion resistance matter more than strength. F-DC: highest strength form of this chemistry — thin chilled skin nearly doubles UTS; use for thin-wall pressure-tight die castings, but never solution treat (blistering). Yield strength is 75 MPa in F-S versus 145 MPa in F-DC.
Sources
- ГОСТ 1583-93 Сплавы алюминиевые литейные (АЛ2 / АК12) — Межгосударственный стандарт (1993)
- ASTM B26/B26M Aluminum-Alloy Sand Castings (443.0) — ASTM International (2018)
- ASTM B85/B85M Aluminum-Alloy Die Castings (A413.0) — ASTM International (2018)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 15: Casting — ASM International (2008)
- GB/T 1173 (ZL102) (2013)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.