Aluminum B443.0
AA B443.0 · UNS A24430
B443.0 is a secondary-grade Al-Si5 sand and permanent-mold casting alloy in the ANSI/AA 4xx.x family, with relaxed impurity limits for general-purpose, non-critical castings.
Reference datasheet — B443.0 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 F-S condition
B443.0 tempers and conditions
B443.0 is supplied in 3 conditions, soft to hard. F-S is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Occasionally specified when maximum dimensional stability and ductility are needed after machining; slightly lower strength than F. | 48 | 117 | 10 | 35 HB | 38 % IACS |
F-SDefault F | Default condition: general-purpose sand castings where pressure tightness and complex shape matter more than strength. | 55 | 130 | 8 | 40 HB | 37 % IACS |
F | Choose for higher-volume gravity-die parts: faster solidification gives finer eutectic and ~15–20 % higher strength and ductility than sand cast. | 62 | 159 | 10 | 45 HB | 37 % IACS |
What is B443.0?
B443.0 is a secondary-grade Al-Si5 sand and permanent-mold casting alloy in the ANSI/AA 4xx.x family, with relaxed impurity limits for general-purpose, non-critical castings. It is chosen for cost and castability rather than strength — 130 MPa tensile, 55 MPa yield, 8% elongation, 40 HB — with 142 W/m·K conductivity and use to about 150 °C; conditions on file are as-sand-cast (F-S), as-permanent-mold-cast (F-P) and annealed (O). It is not heat treatable to higher strength and machinability rates only 38 because of gummy chip behaviour, so A356.0-T6 is the alternative where strength or machined finish matters. B443.0 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 575°C (1,067 °F). B443.0 has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 94% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi).
What is B443.0 used for?
- cookware
- hardware fittings
- general castings
Advantages
- Low embodied carbon — 4 kg CO₂/kg, better than 100% of aluminum grades
- Readily welded — 82/100, better than 76% of aluminum grades
Limitations
- Low strength — 55 MPa (7.98 ksi), worse than 94% of aluminum grades
- Difficult to machine — 38/100, worse than 84% of aluminum grades
- Limited formability — 10/100, worse than 80% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
B443.0 properties
Typical room-temperature values for B443.0-F-S; bars are the position among aluminum grades.
Physical3
B443.0 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 575°C (1,067 °F).
Mechanical11
B443.0 has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 94% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
B443.0 is rated for continuous service to 150°C (302 °F). It conducts heat at 142 W/m·K (82 BTU/hr·ft·°F), better than 51% of aluminum grades. Thermal expansion is 22.1 µm/m·K (12.3 µin/in·°F).
Electrical3
B443.0 conducts electricity at 37 % IACS, better than 58% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 73% of aluminum grades.
Sustainability4
Producing a kilogram of B443.0 takes about 60 MJ of energy and emits 4 kg of CO₂ — less than 99% of aluminum grades. Typical recycled content is 90%.
Manufacturability8
B443.0's machinability is fair (38/100, worse than 84% of aluminum grades); weldability very good (82/100); 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. B443.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with B443.0
Is B443.0 easy to machine?
Gummy with long chips at low Si content — use sharp polished-flute carbide or PCD, high speed, low feed, and flood coolant; expect abrasive tool wear from eutectic Si.
Can B443.0 be welded?
Readily GTAW/GMAW welded with 4043 (Al-Si5) filler, essentially matching composition; low hot-cracking sensitivity, but as-cast strength is not recovered by post-weld heat treatment.
Can B443.0 be formed, bent or molded?
Excellent fluidity and feeding for thin, intricate sand and permanent-mold castings; modify with Na or Sr for finer eutectic and use chills to raise local ductility.
B443.0 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 | 4.5 – 6 | 5.25 |
| Ferelaxed vs 443.0 (0.8) / A443.0 (0.8) — secondary-metal limit | ≤ 0.8 | |
| Cu | ≤ 0.15 | |
| Mn | ≤ 0.35 | |
| Mg | ≤ 0.05 | |
| Zn | ≤ 0.35 | |
| Tigrain refiner | ≤ 0.25 | |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al | balance |
What surface finishes work on B443.0?
Takes clear/hard anodize as a grey, non-uniform film; chromate/phosphate conversion coatings and paint or powder coat give the best appearance and 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 B443.0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A24430
- Also called
- S5A
How much does B443.0 cost?
B443.0 is a standard-cost aluminum ($$), cheaper than about 71% 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.
B443.0 — frequently asked
What is B443.0 used for?
B443.0 is typically used for cookware, hardware fittings and general castings. In short: low-cost general casting alloy; excellent fluidity, low strength; secondary-grade 443.0.
What is the yield strength of B443.0?
B443.0 has a typical yield strength of 55 MPa (7.98 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 94% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is B443.0 easy to machine?
Not especially — machinability is rated fair (38/100, worse than 84% of aluminum grades). Gummy with long chips at low Si content — use sharp polished-flute carbide or PCD, high speed, low feed, and flood coolant; expect abrasive tool wear from eutectic Si.
Can B443.0 be welded?
Yes — weldability is rated very good (82/100). Readily GTAW/GMAW welded with 4043 (Al-Si5) filler, essentially matching composition; low hot-cracking sensitivity, but as-cast strength is not recovered by post-weld heat treatment.
What surface finishes work on B443.0?
Takes clear/hard anodize as a grey, non-uniform film; chromate/phosphate conversion coatings and paint or powder coat give the best appearance and corrosion protection.
Can B443.0 be formed, bent or molded?
Excellent fluidity and feeding for thin, intricate sand and permanent-mold castings; modify with Na or Sr for finer eutectic and use chills to raise local ductility.
What is the maximum service temperature of B443.0?
B443.0 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 B443.0 F-S and B443.0 F-P?
F-S is the default condition — default condition: general-purpose sand castings where pressure tightness and complex shape matter more than strength. F-P: choose for higher-volume gravity-die parts: faster solidification gives finer eutectic and ~15–20 % higher strength and ductility than sand cast. Yield strength is 55 MPa in F-S versus 62 MPa in F-P.
How much does B443.0 cost?
B443.0 is a standard-cost aluminum ($$), cheaper than about 71% 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)
- International Alloy Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (Pink Sheets) — The Aluminum Association (2019)
- ASM Handbook, Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- 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.