Aluminum 393.0-T5
Temper
AA 393.0 · UNS A03930
T5 = cooled from hot working and artificially aged
Cheap stabilizing age used when distortion from solution treatment must be avoided.
Values for the T5 condition
Other 393.0 tempers and conditions
393.0 is listed in 4 conditions; see the grade overview at 393.0.
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 |
T5This page 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-T5?
393.0-T5 is 393.0 in the T5 temper — cheap stabilizing age used when distortion from solution treatment must be avoided. 393.0-T5 has a yield strength of 225 MPa (32.6 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Elongation at break is 0.5% and the elastic modulus is 88 GPa (12.8 Msi). 393.0-T5 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). T6 is the default condition FabDigit quotes; T5 is available on request or by drawing note.
Advantages
- Stiff — 88 GPa (12.8 Msi), better than 98% of aluminum grades
- High service temperature — 230°C (446 °F), better than 95% of aluminum grades
Limitations
- Limited ductility — 0.5%, worse than 99% of aluminum grades
- Low fracture toughness — 12 MPa·√m (10.9 ksi·√in), worse than 99% 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 — 23 % IACS, worse than 97% of aluminum grades
393.0-T5 properties
Typical room-temperature values for 393.0-T5; 22 are specific to this condition. Other listed values are 393.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
393.0-T5 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-T5 has a yield strength of 225 MPa (32.6 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Elongation at break is 0.5% and the elastic modulus is 88 GPa (12.8 Msi).
Thermal6
393.0-T5 is rated for continuous service to 230°C (446 °F). It conducts heat at 127 W/m·K (73.4 BTU/hr·ft·°F), worse than 69% of aluminum grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
393.0-T5 conducts electricity at 23 % IACS, worse than 97% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (44/100), worse than 65% of aluminum grades.
Sustainability4
Producing a kilogram of 393.0-T5 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-T5's machinability is poor (22/100, worse than 98% of aluminum grades); weldability poor (25/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 393.0-T5
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.
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.
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 | — |
393.0-T5 — frequently asked
What is 393.0-T5 used for?
393.0-T5 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-T5?
393.0-T5 has a typical yield strength of 225 MPa (32.6 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 393.0-T5 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-T5 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-T5?
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-T5 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-T5?
393.0-T5 is rated for continuous use to about 230°C (446 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.