Aluminum 201.0
AA 201.0 · UNS A02010, A92010 · also CQ51A
201.0 is a high-strength Al-Cu-Ag sand and permanent-mold casting alloy (A02010, CQ51A) with silver and magnesium additions and T4 through T71 heat treatments.
Reference datasheet — 201.0 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 T7 condition
201.0 tempers and conditions
201.0 is supplied in 6 conditions, soft to hard. T7 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
201.0 is a high-strength Al-Cu-Ag sand and permanent-mold casting alloy (A02010, CQ51A) with silver and magnesium additions and T4 through T71 heat treatments. In T6/T7 it develops about 420 MPa yield and 470 MPa tensile with 6% elongation and HB 130, the highest strength-to-weight ratio among cast aluminums, and it holds properties to 200 °C. It is used for aerospace structural castings that would otherwise be machined from wrought plate. Trade-offs are severe hot-tearing sensitivity, poor fusion weldability, corrosion resistance that requires coating, and foundry cost well above A356.0, the usual alternative when strength allows. 201.0 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). 201.0 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 89% of aluminum grades. Elongation at break is 6% and the elastic modulus is 71 GPa (10.3 Msi).
What is 201.0 used for?
- aerospace structural castings
- missile/aircraft fittings
- high-strength brackets
Advantages
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
- High strength — 420 MPa (60.9 ksi), better than 89% of aluminum grades
- Tough — resists crack growth — 30 MPa·√m (27.3 ksi·√in), better than 76% of aluminum grades
Limitations
- Limited formability — 10/100, worse than 80% of aluminum grades
- Needs corrosion protection — 38/100, worse than 79% of aluminum grades
- Poor heat conductor — 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
201.0 properties
Typical room-temperature values for 201.0-T7; bars are the position among aluminum grades.
Physical3
201.0 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 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 89% of aluminum grades. Elongation at break is 6% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
201.0 is rated for continuous service to 200°C (392 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades. Thermal expansion is 19.3 µm/m·K (10.7 µin/in·°F).
Electrical3
201.0 conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 79% of aluminum grades.
Sustainability4
Producing a kilogram of 201.0 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's machinability is good (65/100, better than 62% of aluminum grades); weldability poor (25/100); 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. 201.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 201.0
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.
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 |
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.
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 201.0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A02010A92010
- Trade names
- CQ51A
How much does 201.0 cost?
201.0 is a high-cost aluminum ($$$$), pricier than about 78% 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.
201.0 — frequently asked
What is 201.0 used for?
201.0 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?
201.0 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 89% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 201.0 easy to machine?
Reasonably — machinability is rated good (65/100, better than 62% 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 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?
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 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?
201.0 is rated for continuous use to about 200°C (392 °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.
How much does 201.0 cost?
201.0 is a high-cost aluminum ($$$$), pricier than about 78% 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
- 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; 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.