Aluminum 201.0-T4
Temper
AA 201.0 · UNS A02010, A92010 · also CQ51A
T4 = solution heat treated and naturally aged
Pick when maximum ductility and impact energy matter more than yield strength, or before subsequent forming/straightening.
Values for the T4 condition
Other 201.0 tempers and conditions
201.0 is listed in 6 conditions; see the grade overview at 201.0.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Only an intermediate condition before solution treatment; 201.0 is never used structurally as-cast. | 110 | 190 | 4 | 65 HB | 35 % IACS |
T4This page Solution heat treated and naturally aged | Pick when maximum ductility and impact energy matter more than yield strength, or before subsequent forming/straightening. | 220 | 380 | 18 | 95 HB | 28 % IACS |
Solution treated and under-aged for maximum toughness | Specified for impact/crash-critical aerospace and armament castings needing high energy absorption with good strength. | 255 | 415 | 17 | 105 HB | 29 % IACS |
Solution heat treated and artificially aged | Choose for the highest room-temperature strength and hardness where corrosion is controlled by coatings. | 380 | 450 | 8 | 125 HB | 31 % IACS |
Solution treated and fully overaged for maximum stability | Used when long-term dimensional stability and elevated-temperature exposure outrank peak strength. | 400 | 440 | 5 | 125 HB | 34 % IACS |
T7Default Solution heat treated and overaged (stabilized) | The standard aerospace condition: near-peak strength with better dimensional stability, elevated-temperature retention and reduced SCC sensitivity. | 420 | 470 | 6 | 130 HB | 32 % IACS |
What is 201.0-T4?
201.0-T4 is 201.0 in the T4 temper — pick when maximum ductility and impact energy matter more than yield strength, or before subsequent forming/straightening. 201.0-T4 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 18% and the elastic modulus is 71 GPa (10.3 Msi). 201.0-T4 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 571°C (1,060 °F). T7 is the default condition FabDigit quotes; T4 is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 38 MPa·√m (34.6 ksi·√in), better than 96% of aluminum grades
- Ductile — tolerates forming and impact — 18%, better than 86% of aluminum grades
Limitations
- Needs corrosion protection — 32/100, worse than 94% of aluminum grades
- Limited service temperature — 100°C (212 °F), 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
- Low electrical conductivity — 28 % IACS, worse than 82% of aluminum grades
- Limited formability — 10/100, worse than 80% of aluminum grades
201.0-T4 properties
Typical room-temperature values for 201.0-T4; 15 are specific to this condition. Other listed values are 201.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
201.0-T4 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 571°C (1,060 °F).
Mechanical14
201.0-T4 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 18% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
201.0-T4 is rated for continuous service to 100°C (212 °F). It conducts heat at 110 W/m·K (63.6 BTU/hr·ft·°F), worse than 88% of aluminum grades. Thermal expansion is 19.3 µm/m·K (10.7 µin/in·°F).
Electrical3
201.0-T4 conducts electricity at 28 % IACS, worse than 82% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is poor (32/100), worse than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 201.0-T4 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 10%.
Manufacturability8
201.0-T4's machinability is good (58/100, worse than 54% of aluminum grades); weldability poor (25/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 201.0-T4
Is 201.0 easy to machine?
Machines very well in T6/T7 with sharp carbide tooling and high speeds; gummy in T4 — use polished flutes and generous coolant.
Can 201.0 be welded?
Poor fusion weldability: severe hot-tearing risk; repair welding only with qualified 2319/206-type filler plus full re-solution and re-age.
Can 201.0 be formed, bent or molded?
Sand and permanent-mold casting only, with chills, heavy risers and directional solidification; long freezing range makes thin, unfed sections hot-tear prone.
What surface finishes work on 201.0?
Chromic/sulfuric anodize as a paint base only (Cu darkens the film); usually chromate-conversion coated and primed, or nickel/cadmium plated for corrosion protection.
201.0 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 |
|---|---|---|
| Cu | 4 – 5.2 | 4.6 |
| Agsilver refines θ' precipitation, raises strength | 0.4 – 1 | 0.7 |
| Mg | 0.15 – 0.55 | 0.35 |
| Mn | 0.2 – 0.5 | 0.35 |
| Tigrain refinement | 0.15 – 0.35 | 0.25 |
| Siimpurity limit | ≤ 0.1 | — |
| Feimpurity limit; A201.0 limits to 0.10 | ≤ 0.15 | — |
| Znimpurity limit | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
201.0-T4 — frequently asked
What is 201.0-T4 used for?
201.0-T4 is typically used for aerospace structural castings, missile/aircraft fittings and high-strength brackets. In short: strongest cast aluminum; aerospace Al-Cu-Ag casting; hot-tear sensitive, hard to weld.
What is the yield strength of 201.0-T4?
201.0-T4 has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 59% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 201.0-T4 easy to machine?
Reasonably — machinability is rated good (58/100, worse than 54% of aluminum grades). Machines very well in T6/T7 with sharp carbide tooling and high speeds; gummy in T4 — use polished flutes and generous coolant.
Can 201.0-T4 be welded?
Not readily — weldability is rated poor (25/100). Poor fusion weldability: severe hot-tearing risk; repair welding only with qualified 2319/206-type filler plus full re-solution and re-age.
What surface finishes work on 201.0-T4?
Chromic/sulfuric anodize as a paint base only (Cu darkens the film); usually chromate-conversion coated and primed, or nickel/cadmium plated for corrosion protection.
Can 201.0-T4 be formed, bent or molded?
Sand and permanent-mold casting only, with chills, heavy risers and directional solidification; long freezing range makes thin, unfed sections hot-tear prone.
What is the maximum service temperature of 201.0-T4?
201.0-T4 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 201.0-T7 and 201.0-F?
T7 is the default condition — the standard aerospace condition: near-peak strength with better dimensional stability, elevated-temperature retention and reduced SCC sensitivity. F: only an intermediate condition before solution treatment; 201.0 is never used structurally as-cast. Yield strength is 420 MPa in T7 versus 110 MPa in F.
Sources
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (2018)
- ASTM B108/B108M — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- Registration Record of Aluminum Association Alloy Designations (Pink Sheets, cast alloys) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- AMS 4229 / AMS 4228 — Aluminum Alloy Castings 201.0/A201.0 — SAE International (2018)
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.