Aluminum 393.0
AA 393.0 · UNS A03930
393.0 (A03930) is a hypereutectic Al-Si-Cu-Ni casting alloy with roughly 22% Si, supplied in F, T5, T6 and T7 tempers within the ANSI/AA cast aluminum series.
Reference datasheet — 393.0 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
393.0 tempers and conditions
393.0 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 | Lowest-cost condition for wear parts where dimensional stability after machining is not critical. | 200 | 220 | 0.5 | 115 HB | 22 % IACS |
Cooled from hot working and artificially aged | Cheap stabilizing age used when distortion from solution treatment must be avoided. | 225 | 245 | 0.5 | 125 HB | 23 % IACS |
Solution heat treated and overaged (stabilized) | Choose when long-term dimensional stability and growth resistance at 250–300 °C outrank peak strength. | 230 | 250 | 1 | 120 HB | 26 % IACS |
T6Default Solution heat treated and artificially aged | Standard condition for high-output pistons: maximum room- and elevated-temperature strength with best wear resistance. | 275 | 290 | 0.7 | 140 HB | 24 % IACS |
What is 393.0?
393.0 (A03930) is a hypereutectic Al-Si-Cu-Ni casting alloy with roughly 22% Si, supplied in F, T5, T6 and T7 tempers within the ANSI/AA cast aluminum series. Engineers choose it for very low thermal expansion, high wear resistance and a 250 °C service ceiling; typical forms are permanent-mold, low-pressure and squeeze-cast pistons and liners at 275 MPa yield, 290 MPa tensile and HB 140. The limits are 0.7% elongation, poor fusion weldability, thermal conductivity of 130 W/m·K and a machinability score of 22 that forces diamond tooling. Where ductility matters more than wear, 390.0 is the nearer casting choice. 393.0 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 555°C (1,031 °F). 393.0 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 70% of aluminum grades. Elongation at break is 0.7% and the elastic modulus is 88 GPa (12.8 Msi).
What is 393.0 used for?
- performance engine pistons
- cylinder liners
- wear plates
Advantages
- Stiff — 88 GPa (12.8 Msi), better than 98% of aluminum grades
- High service temperature — 250°C (482 °F), better than 97% of aluminum grades
Limitations
- Limited ductility — 0.7%, worse than 98% of aluminum grades
- Low fracture toughness — 13 MPa·√m (11.8 ksi·√in), worse than 98% of aluminum grades
- Difficult to machine — 22/100, worse than 98% of aluminum grades
- Hard to polish — 35/100, worse than 98% of aluminum grades
- Low electrical conductivity — 24 % IACS, worse than 95% of aluminum grades
393.0 properties
Typical room-temperature values for 393.0-T6; bars are the position among aluminum grades.
Physical3
393.0 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 555°C (1,031 °F).
Mechanical16
393.0 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 70% of aluminum grades. Elongation at break is 0.7% and the elastic modulus is 88 GPa (12.8 Msi).
Thermal6
393.0 is rated for continuous service to 250°C (482 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), worse than 65% of aluminum grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
393.0 conducts electricity at 24 % IACS, worse than 95% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (43/100), worse than 65% of aluminum grades.
Sustainability4
Producing a kilogram of 393.0 takes about 190 MJ of energy and emits 12 kg of CO₂ — less than 89% of aluminum grades. Typical recycled content is 30%.
Manufacturability8
393.0's machinability is poor (22/100, worse than 98% of aluminum grades); weldability poor (25/100); 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. 393.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 393.0
Is 393.0 easy to machine?
Treat as an abrasive metal-matrix composite: PCD or CVD-diamond tooling, high speed / light feed, flood coolant; carbide life is measured in minutes.
Can 393.0 be welded?
Poor — fusion welding causes hot cracking and coarse Si; repair only by specialized TIG with 4047/4145 filler and preheat, or avoid entirely.
Can 393.0 be formed, bent or molded?
Permanent mold, low-pressure or squeeze casting with phosphorus refinement, ~750–800 °C pour and controlled cooling to keep primary Si fine and evenly dispersed; not a die-casting-friendly or wrought alloy.
393.0 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 |
|---|---|---|
| Siprimary Si; P-refined for fine particle size | 21 – 23 | 22 |
| Cu | 0.7 – 1.1 | 0.9 |
| Mg | 0.7 – 1.3 | 1 |
| Nielevated-temperature aluminides | 2 – 2.5 | 2.2 |
| Fe | ≤ 1.3 | |
| Mn | ≤ 0.1 | |
| Cr | ≤ 0.1 | |
| Zn | ≤ 0.1 | |
| Ti | 0.1 – 0.2 | 0.15 |
| Others (each)each | ≤ 0.05 | |
| Others (total)total | ≤ 0.15 | |
| Al | balance |
What surface finishes work on 393.0?
Hard anodize gives thin dark films only; ring grooves are usually hard-anodized or Ni-plated, skirts tin-plated or graphite/moly coated for scuff resistance.
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 393.0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A03930
How much does 393.0 cost?
393.0 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.
393.0 — frequently asked
What is 393.0 used for?
393.0 is typically used for performance engine pistons, cylinder liners and wear plates. In short: lowest-expansion cast aluminum; highest wear resistance; needs diamond tooling.
What is the yield strength of 393.0?
393.0 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 70% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 393.0 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 98% of aluminum grades). Treat as an abrasive metal-matrix composite: PCD or CVD-diamond tooling, high speed / light feed, flood coolant; carbide life is measured in minutes.
Can 393.0 be welded?
Not readily — weldability is rated poor (25/100). Poor — fusion welding causes hot cracking and coarse Si; repair only by specialized TIG with 4047/4145 filler and preheat, or avoid entirely.
What surface finishes work on 393.0?
Hard anodize gives thin dark films only; ring grooves are usually hard-anodized or Ni-plated, skirts tin-plated or graphite/moly coated for scuff resistance.
Can 393.0 be formed, bent or molded?
Permanent mold, low-pressure or squeeze casting with phosphorus refinement, ~750–800 °C pour and controlled cooling to keep primary Si fine and evenly dispersed; not a die-casting-friendly or wrought alloy.
What is the maximum service temperature of 393.0?
393.0 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 393.0-T6 and 393.0-F?
T6 is the default condition — standard condition for high-output pistons: maximum room- and elevated-temperature strength with best wear resistance. F: lowest-cost condition for wear parts where dimensional stability after machining is not critical. Yield strength is 275 MPa in T6 versus 200 MPa in F.
How much does 393.0 cost?
393.0 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
- Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (Pink Sheets) — The Aluminum Association (2018)
- ASTM B108 / B26 — Aluminum-Alloy Permanent Mold and Sand Castings — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
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.