Aluminum 535
AA 535 · UNS A05350 · EN AlMg7 · also Almag 35, GM70B
535.0 (Almag 35 / AlMg7) is a cast aluminum alloy with about 7% magnesium that reaches high strength and excellent elongation by solid-solution strengthening in the as-cast (F) condition, with no heat treatment required.
535 tempers and conditions
535 is supplied in 3 conditions, soft to hard.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | The only commercially supplied condition: solid-solution strengthened as cast, use for maximum corrosion resistance, machinability and dimensional stability. | 140 | 275 | 13 | 70 HB | 24 % IACS |
Cooled from hot working and artificially aged | Non-standard for 535.0 (normally supplied as-cast F); a low-temperature stabilizing age is used mainly for dimensional stability, raising yield slightly while cutting elongation and sensitizing the high-Mg matrix to intergranular attack and SCC. | 155 | 260 | 8 | 73 HB | 25 % IACS |
Solution heat treated and artificially aged | Non-standard for 535.0 (AA registers this alloy only as -F); a solution treat plus artificial age precipitates Mg-rich β-phase, giving a modest strength and hardness gain at the cost of ductility and the alloy's outstanding corrosion/SCC resistance. | 170 | 290 | 6 | 80 HB | 25 % IACS |
What is 535?
535.0 (Almag 35 / AlMg7) is a cast aluminum alloy with about 7% magnesium that reaches high strength and excellent elongation by solid-solution strengthening in the as-cast (F) condition, with no heat treatment required. Among cast aluminum alloys it offers the best corrosion resistance, especially in marine and alkaline service, together with the best machinability and anodized appearance, so it is used for marine hardware, instrument housings and food and chemical fittings. The trade-offs are poor castability (high Mg oxidises, forms dross and hot tears and needs tight melt and pouring control), higher cost, and a limited service temperature, since high-Mg alloys tend to sensitise and stress-corrode above roughly 65–100 °C. 535 has a density of 2.62 g/cm³ (0.0947 lb/in³), lighter than 96% of aluminum grades. It melts at 549°C (1,020 °F). 535 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 70% of aluminum grades. Elongation at break is 13% and the elastic modulus is 71 GPa (10.3 Msi).
What is 535 used for?
- Marine castings
- Saltwater deck and rigging hardware
- Instrument and sensor housings
- Food processing fittings
- Chemical handling components
- Outboard motor parts
- Anodized cast enclosures
Advantages
- Easy to machine — 85/100, better than 95% of aluminum grades
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
- Ductile — tolerates forming and impact — 13%, better than 79% of aluminum grades
- Good corrosion resistance — 68/100, better than 75% of aluminum grades
Limitations
- Poor heat conductor — 96 W/m·K (55.5 BTU/hr·ft·°F), worse than 95% of aluminum grades
- Low electrical conductivity — 24 % IACS, worse than 95% of aluminum grades
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
535 properties
Typical room-temperature values; bars are the position among aluminum grades.
Physical3
535 has a density of 2.62 g/cm³ (0.0947 lb/in³), lighter than 96% of aluminum grades. It melts at 549°C (1,020 °F).
Mechanical10
535 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 70% of aluminum grades. Elongation at break is 13% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
535 is rated for continuous service to 100°C (212 °F). It conducts heat at 96 W/m·K (55.5 BTU/hr·ft·°F), worse than 95% of aluminum grades. Thermal expansion is 24.5 µm/m·K (13.6 µin/in·°F).
Electrical3
535 conducts electricity at 24 % IACS, worse than 95% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 75% of aluminum grades.
Sustainability4
Producing a kilogram of 535 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 20%.
Manufacturability7
535's machinability is excellent (85/100, better than 95% of aluminum grades); weldability very good (70/100).
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. 535 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 535
Is 535 easy to machine?
Outstanding chip formation and surface finish — the benchmark machining alloy among Al castings; use sharp polished-flute carbide, high speed, low feed, minimal lubricant.
Can 535 be welded?
Readily GTAW/GMAW welded with 5356 or 5556 filler; keep interpass temperature low and avoid Si-bearing (4000 series) filler to prevent brittle Mg2Si.
Can 535 be formed, bent or molded?
Sand and permanent-mold casting only; low fluidity and strong Mg oxidation demand flux/cover-gas melt protection, chilled risers and generous gating to avoid hot tears and dross.
Manufacturability
The process limits FabDigit applies to 535. Every 535 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Better85 / 100 |
|---|---|
| ISO material group | N.1 |
| Cutting speed (rough / finish) | 350 / 420 m/min |
| Minimum wall | 0.5 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 8× diameter |
| Best surface (machined / polished) | Ra 0.8 / — |
| Hardenable after machining | No |
535 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 |
|---|---|---|
| Mgprincipal solid-solution strengthener | 6.2 – 7.5 | 6.9 |
| Mn | 0.1 – 0.25 | 0.18 |
| Tigrain refiner | 0.1 – 0.25 | 0.18 |
| Si | ≤ 0.15 | |
| Fe | ≤ 0.15 | |
| Cu | ≤ 0.05 | |
| Zn | ≤ 0.1 | |
| Others (each)total 0.15 max | ≤ 0.05 | |
| Al | balance |
What surface finishes work on 535?
Excellent clear and hard anodizing with bright uniform color; polishes well; chromate/chrome-free conversion coatings and marine paints adhere readily — no plating or brazing.
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).
Passivation
Conversion Coating
PVD Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 535 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A05350
- EN / DIN / Werkstoff-Nr.
- AlMg7
- Trade names
- Almag 35GM70B
- Similar grades
- ZL301
How much does 535 cost?
535 is a standard-cost aluminum ($$), cheaper than about 81% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
535 — frequently asked
What is 535 used for?
535 is typically used for marine castings, saltwater deck and rigging hardware, instrument and sensor housings, food processing fittings, chemical handling components and outboard motor parts. In short: cast Al-Mg, marine grade.
What is the yield strength of 535?
535 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 70% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is 535 easy to machine?
Yes — machinability is rated excellent (85/100, better than 95% of aluminum grades). Outstanding chip formation and surface finish — the benchmark machining alloy among Al castings; use sharp polished-flute carbide, high speed, low feed, minimal lubricant.
Can 535 be welded?
Yes — weldability is rated very good (70/100). Readily GTAW/GMAW welded with 5356 or 5556 filler; keep interpass temperature low and avoid Si-bearing (4000 series) filler to prevent brittle Mg2Si.
What surface finishes work on 535?
Excellent clear and hard anodizing with bright uniform color; polishes well; chromate/chrome-free conversion coatings and marine paints adhere readily — no plating or brazing.
Can 535 be formed, bent or molded?
Sand and permanent-mold casting only; low fluidity and strong Mg oxidation demand flux/cover-gas melt protection, chilled risers and generous gating to avoid hot tears and dross.
What is the maximum service temperature of 535?
535 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 535 cost?
535 is a standard-cost aluminum ($$), cheaper than about 81% 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.
Can FabDigit make parts in 535?
Yes — 535 is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
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 and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot ('Pink Sheets') — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
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.