Aluminum 358.0
AA 358.0
358.0 is an Al-Si-Mg sand and permanent-mold casting alloy in the ANSI/AA 3xx.x series, closely related to 356/357 and strengthened by Mg2Si precipitation in the F, T5, T6, T61, T62 and T7 conditions.
Reference datasheet — 358.0 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
358.0 tempers and conditions
358.0 is supplied in 6 conditions, soft to hard. T6 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 | Untreated castings used only as an intermediate state before solution treatment, or for non-structural parts. | 95 | 180 | 6 | 55 HB | 41 % IACS |
Cooled from hot working and artificially aged | Low-cost partial strengthening with no solution treatment; used when distortion from quenching must be avoided. | 150 | 205 | 3 | 70 HB | 42 % IACS |
Solution heat treated and overaged (stabilized) | Overaged for dimensional stability and lower residual stress where elevated-temperature service or machining stability governs. | 220 | 275 | 6 | 85 HB | 42 % IACS |
T6 variant, underaged | Underaged/controlled-age variant chosen when higher elongation and toughness matter more than peak yield strength. | 250 | 320 | 8 | 90 HB | 39 % IACS |
T6Default Solution heat treated and artificially aged | Standard supply condition: best balance of strength and ductility for structural sand, permanent-mold and investment castings. | 275 | 345 | 5 | 100 HB | 39 % IACS |
T6, heat treated by the user | Peak-aged condition for maximum strength in aerospace and highly loaded castings, at the cost of ductility and toughness. | 290 | 379 | 5 | 110 HB | 38 % IACS |
What is 358.0?
358.0 is an Al-Si-Mg sand and permanent-mold casting alloy in the ANSI/AA 3xx.x series, closely related to 356/357 and strengthened by Mg2Si precipitation in the F, T5, T6, T61, T62 and T7 conditions. Engineers use it for moderate-strength, pressure-tight castings with good fluidity: 275 MPa yield, 345 MPa tensile, 5% elongation, 100 HB, 72 GPa modulus, 151 W/m·K and 39% IACS. Service is limited to about 150 °C, corrosion resistance is moderate (score 58), and the beryllium content demands fume extraction when welding or grinding. 356.0 or A357.0 are the nearest alternatives where a beryllium-free chemistry is required. 358.0 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 557°C (1,035 °F). 358.0 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 70% of aluminum grades. Elongation at break is 5% and the elastic modulus is 72 GPa (10.4 Msi).
What is 358.0 used for?
- General-purpose sand castings
- Permanent-mold pump and valve bodies
- Pressure-tight manifold and housing castings
- Aerospace brackets and fittings in T6
- Investment-cast structural components
- Gearbox cases and covers
- Automotive suspension castings
Limitations
- Limited formability — 10/100, worse than 80% of aluminum grades
358.0 properties
Typical room-temperature values for 358.0-T6; bars are the position among aluminum grades.
Physical3
358.0 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 557°C (1,035 °F).
Mechanical11
358.0 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 70% of aluminum grades. Elongation at break is 5% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
358.0 is rated for continuous service to 150°C (302 °F). It conducts heat at 151 W/m·K (87.2 BTU/hr·ft·°F), better than 63% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
358.0 conducts electricity at 39 % IACS, better than 65% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 57% of aluminum grades.
Sustainability4
Producing a kilogram of 358.0 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 15%.
Manufacturability8
358.0's machinability is good (60/100, worse than 51% of aluminum grades); weldability very good (70/100); 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. 358.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 358.0
Is 358.0 easy to machine?
Machines well with sharp PCD or polished carbide tooling, high speed and flood coolant; the hard eutectic Si is abrasive so HSS tool life is short.
Can 358.0 be welded?
GTAW/GMAW with 4043 or 4047 filler is routine for repair, but the joint must be re-solution treated and aged to recover T6 properties; beryllium fume extraction is mandatory.
Can 358.0 be formed, bent or molded?
A casting alloy only — excellent fluidity and pressure tightness in sand, permanent-mold and investment casting; use chills and directional solidification, HIP for aerospace class-A parts.
358.0 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 |
|---|---|---|
| Si | 7.6 – 8.6 | 8.1 |
| Mg | 0.4 – 0.6 | 0.5 |
| BeBeryllium addition — melting/welding fume requires dedicated extraction and PPE | 0.1 – 0.3 | 0.18 |
| Tigrain refinement | 0.1 – 0.2 | 0.15 |
| Feimpurity limit | ≤ 0.2 | |
| Cuimpurity limit | ≤ 0.2 | |
| Mnimpurity limit | ≤ 0.2 | |
| Znimpurity limit | ≤ 0.1 | |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al | balance |
What surface finishes work on 358.0?
Takes sulfuric and hard-coat anodizing for protection (dark grey cosmetic due to Si), chromate/trivalent conversion coating and primer-paint systems; bright decorative anodizing is not practical.
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
How much does 358.0 cost?
358.0 is a premium-cost aluminum ($$$), cheaper than about 51% 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.
358.0 — frequently asked
What is 358.0 used for?
358.0 is typically used for general-purpose sand castings, permanent-mold pump and valve bodies, pressure-tight manifold and housing castings, aerospace brackets and fittings in T6, investment-cast structural components and gearbox cases and covers. In short: heat-treatable Al-Si-Mg casting alloy; good castability, moderate strength; beryllium-bearing; fume control needed.
What is the yield strength of 358.0?
358.0 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 70% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 358.0 easy to machine?
Reasonably — machinability is rated good (60/100, worse than 51% of aluminum grades). Machines well with sharp PCD or polished carbide tooling, high speed and flood coolant; the hard eutectic Si is abrasive so HSS tool life is short.
Can 358.0 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with 4043 or 4047 filler is routine for repair, but the joint must be re-solution treated and aged to recover T6 properties; beryllium fume extraction is mandatory.
What surface finishes work on 358.0?
Takes sulfuric and hard-coat anodizing for protection (dark grey cosmetic due to Si), chromate/trivalent conversion coating and primer-paint systems; bright decorative anodizing is not practical.
Can 358.0 be formed, bent or molded?
A casting alloy only — excellent fluidity and pressure tightness in sand, permanent-mold and investment casting; use chills and directional solidification, HIP for aerospace class-A parts.
What is the maximum service temperature of 358.0?
358.0 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 358.0-T6 and 358.0-F?
T6 is the default condition — standard supply condition: best balance of strength and ductility for structural sand, permanent-mold and investment castings. F: untreated castings used only as an intermediate state before solution treatment, or for non-structural parts. Yield strength is 275 MPa in T6 versus 95 MPa in F.
How much does 358.0 cost?
358.0 is a premium-cost aluminum ($$$), cheaper than about 51% 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
- Registration Record of International Alloy Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (Pink Sheets) — The Aluminum Association (2019)
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (2018)
- ASTM B108/B108M — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- 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. 19 — Fatigue and Fracture — ASM International (1996)
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.