Aluminum AC2A
JIS AC2A
AC2A is a JIS Al-Cu-Si sand and gravity die casting alloy corresponding to A319.0 and ZL203, supplied in F, T5, T6 and T7.
Reference datasheet — AC2A is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T6 condition
AC2A tempers and conditions
AC2A is supplied in 4 conditions, soft to hard. T6 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Pick the as-cast sand or permanent-mould state for lowest cost and best dimensional stability in low to moderately loaded housings and oil-gallery bodies; 190 MPa tensile, 125 MPa yield. | 125 | 190 | 2 | 70 HB | 27 % IACS |
Solution heat treated and overaged (stabilized) | Pick the solution treated and overaged state when dimensional stability and long-term service to 200 °C outweigh strength; tensile falls to 215 MPa while elongation rises to 2.5%. | 150 | 215 | 2.5 | 75 HB | 30 % IACS |
T6Default Solution heat treated and artificially aged | Use solution heat treated and artificially aged castings for the highest strength state, 250 MPa tensile and 85 HB, in load-bearing housings, cylinder blocks and brackets needing wear resistance. | 170 | 250 | 2 | 85 HB | 27 % IACS |
Cooled from hot working and artificially aged | Choose when the casting is only artificially aged without solution treatment: hardness reaches 80 HB with better machinability and far less distortion and cracking risk than T6. | 180 | 205 | 1.5 | 80 HB | 28 % IACS |
What is AC2A?
AC2A is a JIS Al-Cu-Si sand and gravity die casting alloy corresponding to A319.0 and ZL203, supplied in F, T5, T6 and T7. The copper plus eutectic silicon combination balances strength, machinability and castability: 170 MPa yield, 250 MPa tensile, 2% elongation, 85 HB, 110 W/m·K, 27% IACS, machinability 72 and service to 175 °C. Elongation is low, weldability is poor and decorative anodizing is not practical, so parts are normally conversion-coated or painted. AC4C/A356 is the alternative where ductility and corrosion resistance matter more. AC2A has a density of 2.79 g/cm³ (0.101 lb/in³), heavier than 77% of aluminum grades. It melts at 516°C (961 °F). AC2A has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 56% of aluminum grades. Elongation at break is 2% and the elastic modulus is 74 GPa (10.7 Msi).
What is AC2A used for?
- gearbox housings
- pump bodies
- general machinery castings
Advantages
- High service temperature — 175°C (347 °F), better than 83% of aluminum grades
- Easy to machine — 72/100, better than 80% of aluminum grades
Limitations
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Poor heat conductor — 110 W/m·K (63.6 BTU/hr·ft·°F), worse than 88% of aluminum grades
- Limited ductility — 2%, worse than 87% of aluminum grades
- Low electrical conductivity — 27 % IACS, worse than 86% of aluminum grades
- Limited formability — 10/100, worse than 80% of aluminum grades
AC2A properties
Typical room-temperature values for AC2A-T6; bars are the position among aluminum grades.
Physical3
AC2A has a density of 2.79 g/cm³ (0.101 lb/in³), heavier than 77% of aluminum grades. It melts at 516°C (961 °F).
Mechanical12
AC2A has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 56% of aluminum grades. Elongation at break is 2% and the elastic modulus is 74 GPa (10.7 Msi).
Thermal6
AC2A is rated for continuous service to 175°C (347 °F). It conducts heat at 110 W/m·K (63.6 BTU/hr·ft·°F), worse than 88% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
AC2A conducts electricity at 27 % IACS, worse than 86% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 69% of aluminum grades.
Sustainability4
Producing a kilogram of AC2A takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 80%.
Manufacturability8
AC2A's machinability is very good (72/100, better than 80% of aluminum grades); weldability fair (35/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. AC2A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AC2A
Is AC2A easy to machine?
Copper content plus eutectic silicon gives better machinability than straight Al-Si alloys, with good chip breaking. Use diamond or coated carbide tooling at high speed and light feed for a good surface finish.
Can AC2A be welded?
Weldability is poor and the high Cu content makes the alloy hot-crack prone. For repair use 4043/4145 filler with 150-200 °C preheat, then re-heat-treat to T6 to restore properties.
Can AC2A be formed, bent or molded?
Suited to sand and gravity permanent-mould casting; fluidity is moderate to good and hot-tearing tendency is moderate. Provide good feeding with adequate risers and avoid very thin wall sections.
AC2A 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 |
|---|---|---|
| SiJIS H5202 AC2A | 4 – 6 | 5 |
| Cu | 3 – 4.5 | 3.8 |
| Mg | ≤ 0.25 | |
| Zn | ≤ 0.55 | |
| Femaximum impurity limit | ≤ 0.8 | |
| Mn | ≤ 0.55 | |
| Ni | ≤ 0.3 | |
| Ti | ≤ 0.2 | |
| Cr | ≤ 0.15 | |
| Pb | ≤ 0.15 | |
| Sn | ≤ 0.05 | |
| Al | balance |
What surface finishes work on AC2A?
Chemical conversion coating or painting is standard. Decorative anodizing is not recommended because films come out grey and dull; hard anodize or powder coat can be used, and polishing is limited by the silicon particles.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum AC2A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- A319.0ZL203319.0
How much does AC2A cost?
AC2A is a standard-cost aluminum ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
AC2A — frequently asked
What is AC2A used for?
AC2A is typically used for gearbox housings, pump bodies and general machinery castings. In short: balanced Al-Cu-Si casting alloy; better machining than Al-Si; moderate hot-tear risk.
What is the yield strength of AC2A?
AC2A has a typical yield strength of 170 MPa (24.7 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 56% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is AC2A easy to machine?
Yes — machinability is rated very good (72/100, better than 80% of aluminum grades). Copper content plus eutectic silicon gives better machinability than straight Al-Si alloys, with good chip breaking. Use diamond or coated carbide tooling at high speed and light feed for a good surface finish.
Can AC2A be welded?
With care — weldability is rated fair (35/100). Weldability is poor and the high Cu content makes the alloy hot-crack prone. For repair use 4043/4145 filler with 150-200 °C preheat, then re-heat-treat to T6 to restore properties.
What surface finishes work on AC2A?
Chemical conversion coating or painting is standard. Decorative anodizing is not recommended because films come out grey and dull; hard anodize or powder coat can be used, and polishing is limited by the silicon particles.
Can AC2A be formed, bent or molded?
Suited to sand and gravity permanent-mould casting; fluidity is moderate to good and hot-tearing tendency is moderate. Provide good feeding with adequate risers and avoid very thin wall sections.
What is the maximum service temperature of AC2A?
AC2A is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AC2A-T6 and AC2A-F?
T6 is the default condition — use solution heat treated and artificially aged castings for the highest strength state, 250 MPa tensile and 85 HB, in load-bearing housings, cylinder blocks and brackets needing wear resistance. F: pick the as-cast sand or permanent-mould state for lowest cost and best dimensional stability in low to moderately loaded housings and oil-gallery bodies; 190 MPa tensile, 125 MPa yield. Yield strength is 170 MPa in T6 versus 125 MPa in F.
How much does AC2A cost?
AC2A is a standard-cost aluminum ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- JIS H 5202 Aluminium alloy castings — JSA (2010)
- ASM Handbook Vol.2: Properties and Selection — Nonferrous Alloys (319.0/A319.0) — ASM International (1990)
- Aluminum Association Pink Sheets — Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot — The Aluminum Association (2018)
- GB/T 1173 (ZL203) (2013)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.