Aluminum AC2B
JIS AC2B
AC2B is a lower-cost JIS Al-Cu-Si casting alloy with a wider composition tolerance than AC2A, also cross-referenced to A319.0, and supplied in F, T5, T6 and T7.
Reference datasheet — AC2B 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 F condition
AC2B tempers and conditions
AC2B is supplied in 4 conditions, soft to hard. F 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 |
|---|---|---|---|---|---|---|
FDefault As fabricated | Default, lowest-cost condition for general non-critical sand or permanent-mold castings. | 110 | 180 | 2 | 70 HB | 27 % IACS |
Cooled from hot working and artificially aged | Cheap strength/stability bump without solution treatment; used to stabilize dimensions before machining. | 150 | 200 | 1.5 | 80 HB | 28 % IACS |
Solution heat treated and overaged (stabilized) | Use where dimensional stability at elevated temperature matters more than peak strength. | 165 | 230 | 2.5 | 82 HB | 30 % IACS |
Solution heat treated and artificially aged | Pick when maximum strength and hardness are needed from an AC2B casting; JIS minimum 240 MPa. | 200 | 270 | 2 | 95 HB | 29 % IACS |
What is AC2B?
AC2B is a lower-cost JIS Al-Cu-Si casting alloy with a wider composition tolerance than AC2A, also cross-referenced to A319.0, and supplied in F, T5, T6 and T7. It is specified for less critical general engineering castings such as housings and brackets: 110 MPa yield, 180 MPa tensile, 2% elongation, 70 HB, 109 W/m·K, 27% IACS, machinability 65 and service to 150 °C. Strength and machinability sit below AC2A, and the copper content keeps it hot-crack sensitive and prone to porosity, so pressure-tight parts often need impregnation. Step up to AC2A or AC4C when properties must be controlled. AC2B has a density of 2.77 g/cm³ (0.1 lb/in³), heavier than 71% of aluminum grades. It melts at 516°C (961 °F). AC2B has a yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Elongation at break is 2% and the elastic modulus is 74 GPa (10.7 Msi).
What is AC2B used for?
- housings
- brackets
- general castings
Limitations
- Limited formability — 5/100, worse than 94% of aluminum grades
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Poor heat conductor — 109 W/m·K (63 BTU/hr·ft·°F), worse than 90% of aluminum grades
- Limited ductility — 2%, worse than 87% of aluminum grades
- Low electrical conductivity — 27 % IACS, worse than 86% of aluminum grades
AC2B properties
Typical room-temperature values for AC2B-F; bars are the position among aluminum grades.
Physical3
AC2B has a density of 2.77 g/cm³ (0.1 lb/in³), heavier than 71% of aluminum grades. It melts at 516°C (961 °F).
Mechanical13
AC2B has a yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Elongation at break is 2% and the elastic modulus is 74 GPa (10.7 Msi).
Thermal6
AC2B is rated for continuous service to 150°C (302 °F). It conducts heat at 109 W/m·K (63 BTU/hr·ft·°F), worse than 90% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
AC2B 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 AC2B takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 85%.
Manufacturability8
AC2B's machinability is good (65/100, better than 62% of aluminum grades); weldability fair (35/100); formability not recommended (5/100).
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. AC2B is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AC2B
Is AC2B easy to machine?
Machines freely with carbide/PCD tooling; use high speed, generous coolant and sharp geometry — free Si is abrasive and porosity can smear.
Can AC2B be welded?
Cu content makes it hot-crack prone; repair-weld with 4043/4145 filler, preheat 150–200 °C and keep heat input low; post-weld T6 recovers strength.
Can AC2B be formed, bent or molded?
Casting alloy only — excellent fluidity for thin sand/permanent-mold sections; degas and grain-refine to control shrinkage porosity; no cold forming.
AC2B 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 |
|---|---|---|
| Si | 5 – 7 | 6 |
| Cu | 2 – 4 | 3 |
| Mg | ≤ 0.5 | 0.15 |
| Znwider tolerance than AC2A | ≤ 1 | |
| Fesecondary-ingot impurity | ≤ 1 | 0.7 |
| Mn | ≤ 0.5 | |
| Ni | ≤ 0.35 | |
| Tigrain refiner | ≤ 0.2 | |
| Sn | ≤ 0.1 | |
| Pb | ≤ 0.2 | |
| Al | balance |
What surface finishes work on AC2B?
Do not use decorative anodizing (dark grey mottling from Si/Cu); prefer shot blast + chromate/conversion coat, powder coat or paint; impregnation often needed for pressure tightness.
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 AC2B in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- A319.0319.0
How much does AC2B cost?
AC2B 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.
AC2B — frequently asked
What is AC2B used for?
AC2B is typically used for housings, brackets and general castings. In short: low-cost general casting alloy; wide composition tolerance; non-critical parts only.
What is the yield strength of AC2B?
AC2B has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is AC2B easy to machine?
Reasonably — machinability is rated good (65/100, better than 62% of aluminum grades). Machines freely with carbide/PCD tooling; use high speed, generous coolant and sharp geometry — free Si is abrasive and porosity can smear.
Can AC2B be welded?
With care — weldability is rated fair (35/100). Cu content makes it hot-crack prone; repair-weld with 4043/4145 filler, preheat 150–200 °C and keep heat input low; post-weld T6 recovers strength.
What surface finishes work on AC2B?
Do not use decorative anodizing (dark grey mottling from Si/Cu); prefer shot blast + chromate/conversion coat, powder coat or paint; impregnation often needed for pressure tightness.
Can AC2B be formed, bent or molded?
Casting alloy only — excellent fluidity for thin sand/permanent-mold sections; degas and grain-refine to control shrinkage porosity; no cold forming.
What is the maximum service temperature of AC2B?
AC2B 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 AC2B-F and AC2B-T6?
F is the default condition — default, lowest-cost condition for general non-critical sand or permanent-mold castings. T6: pick when maximum strength and hardness are needed from an AC2B casting; JIS minimum 240 MPa. Yield strength is 110 MPa in F versus 200 MPa in T6.
How much does AC2B cost?
AC2B 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)
- ASTM B26/B26M Standard Specification for Aluminum-Alloy Sand Castings — ASTM (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys (319.0) — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Aluminum Association Teal Sheets — casting alloy registrations — The Aluminum Association (2015)
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.