Aluminum BAlSi-2 AS-BRAZED
Heat-treated state · default condition
ASTM AWS A5.8 BAlSi-2 · EN B Al 4343
Use for design of the solidified BAlSi-2 fillet or joint after a 595–620 °C braze cycle.
Values for the AS-BRAZED condition
Other BAlSi-2 tempers and conditions
BAlSi-2 is listed in 5 conditions; see the grade overview at BAlSi-2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
4343 cladding on 3003 brazing sheet, annealed composite | The dominant commercial form: soft 3003-core brazing sheet with 5–15 % per-side 4343 cladding for deep-drawn header plates and tube stock. | 48 | 115 | 25 | 32 HB | 47 % IACS |
Annealed | Standard soft supply condition for coiled 4343 braze wire, cut rods and preform strip that must be bent or stamped. | 55 | 130 | 20 | 42 HB | 43 % IACS |
AS-BRAZEDDefaultThis page solidified filler / joint condition | Use for design of the solidified BAlSi-2 fillet or joint after a 595–620 °C braze cycle. | 60 | 165 | 10 | 48 HB | 42 % IACS |
4343-clad brazing sheet, half-hard composite | Use where the pre-braze blank must resist handling damage or hold tight roll-formed tube seams before the braze cycle. | 130 | 150 | 8 | 40 HB | 41 % IACS |
Strain hardened, half hard | Pick when straight rods or wire must feed stiffly through automatic ring-forming and wire-feed equipment. | 145 | 165 | 5 | 52 HB | 41 % IACS |
What is BAlSi-2 AS-BRAZED?
BAlSi-2 AS-BRAZED is BAlSi-2 heat treated to AS-BRAZED — use for design of the solidified BAlSi-2 fillet or joint after a 595–620 °C braze cycle. BAlSi-2 AS-BRAZED has a yield strength of 60 MPa (8.7 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi). BAlSi-2 AS-BRAZED has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 577°C (1,071 °F).
Advantages
- Conducts heat well — 175 W/m·K (101.1 BTU/hr·ft·°F), better than 85% of aluminum grades
- High electrical conductivity — 42 % IACS, better than 81% of aluminum grades
Limitations
- Low strength — 60 MPa (8.7 ksi), worse than 93% of aluminum grades
- Hard to polish — 40/100, worse than 91% of aluminum grades
BAlSi-2 AS-BRAZED properties
Typical room-temperature values for BAlSi-2 AS-BRAZED; 19 are specific to this condition. Other listed values are BAlSi-2 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
BAlSi-2 AS-BRAZED has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 577°C (1,071 °F).
Mechanical13
BAlSi-2 AS-BRAZED has a yield strength of 60 MPa (8.7 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
BAlSi-2 AS-BRAZED is rated for continuous service to 150°C (302 °F). It conducts heat at 175 W/m·K (101.1 BTU/hr·ft·°F), better than 85% of aluminum grades. Thermal expansion is 21.6 µm/m·K (12 µin/in·°F).
Electrical3
BAlSi-2 AS-BRAZED conducts electricity at 42 % IACS, better than 81% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of BAlSi-2 AS-BRAZED takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 30%.
Manufacturability8
BAlSi-2 AS-BRAZED's machinability is fair (45/100, worse than 72% of aluminum grades); weldability fair (45/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAlSi-2 AS-BRAZED
Is BAlSi-2 easy to machine?
Rarely machined; the near-eutectic Si particles are abrasive, so use PCD or polished-flute carbide, high speed and flood coolant to avoid smearing.
Can BAlSi-2 be welded?
Not a structural weld metal — it is the filler itself; hold braze temperature 595–620 °C with tight time control, since overheating dissolves the core and causes filler run-off.
Can BAlSi-2 be formed, bent or molded?
Monolithic 4343 is low-ductility, but as a 5–15 % cladding on 3003/6951 it deep-draws and roll-forms almost like the core alloy.
What surface finishes work on BAlSi-2?
Anodizing gives a dark mottled film; prefer chromate-free conversion coating, epoxy/PA e-coat or as-brazed CAB flux residue rinse for corrosion protection.
BAlSi-2 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 |
|---|---|---|
| Siprimary melting-point depressant | 6.8 – 8.2 | 7.5 |
| Fe | ≤ 0.8 | 0.35 |
| Cu | ≤ 0.25 | 0.05 |
| Mn | ≤ 0.1 | 0.02 |
| Zn | ≤ 0.2 | 0.03 |
| Be0.008 % max in some national versions; restricted for occupational-health reasons | ≤ 8×10⁻⁴ | — |
| Others (each)0.15 % total | ≤ 0.05 | — |
| Al | balance | — |
BAlSi-2 AS-BRAZED — frequently asked
What is BAlSi-2 AS-BRAZED used for?
BAlSi-2 AS-BRAZED is typically used for automotive radiators, HVAC heat exchangers and furnace brazing of aluminum sheet. In short: standard brazing-sheet cladding; narrow Al-Si melting range; high-conductivity braze joints.
What is the yield strength of BAlSi-2 AS-BRAZED?
BAlSi-2 AS-BRAZED has a typical yield strength of 60 MPa (8.7 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is BAlSi-2 AS-BRAZED easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 72% of aluminum grades). Rarely machined; the near-eutectic Si particles are abrasive, so use PCD or polished-flute carbide, high speed and flood coolant to avoid smearing.
Can BAlSi-2 AS-BRAZED be welded?
With care — weldability is rated fair (45/100). Not a structural weld metal — it is the filler itself; hold braze temperature 595–620 °C with tight time control, since overheating dissolves the core and causes filler run-off.
What surface finishes work on BAlSi-2 AS-BRAZED?
Anodizing gives a dark mottled film; prefer chromate-free conversion coating, epoxy/PA e-coat or as-brazed CAB flux residue rinse for corrosion protection.
Can BAlSi-2 AS-BRAZED be formed, bent or molded?
Monolithic 4343 is low-ductility, but as a 5–15 % cladding on 3003/6951 it deep-draws and roll-forms almost like the core alloy.
What is the maximum service temperature of BAlSi-2 AS-BRAZED?
BAlSi-2 AS-BRAZED 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 BAlSi-2 AS-BRAZED and BAlSi-2-H14?
AS-BRAZED is the default condition — use for design of the solidified BAlSi-2 fillet or joint after a 595–620 °C braze cycle. H14: pick when straight rods or wire must feed stiffly through automatic ring-forming and wire-feed equipment. Yield strength is 60 MPa in AS-BRAZED versus 145 MPa in H14.
Sources
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- Aluminum Association Teal Sheets — International Alloy Designations and Chemical Composition Limits for Wrought Aluminum — The Aluminum Association (2018)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Aluminum Brazing) — ASM International (1993)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum brazing sheet and Al-Si filler product data (3003/4343 clad) — Novelis / Granges / Chinese clad-sheet mills (2023)
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.