Aluminum BAlSi-11-O (Annealed)
Temper
ASTM AWS A5.8 BAlSi-11
Choose for hand-fed rod, coiled wire and rolled foil preform stock supplied soft for easy shaping.
Values for the O condition
Other BAlSi-11 tempers and conditions
BAlSi-11 is listed in 3 conditions; see the grade overview at BAlSi-11.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Choose for hand-fed rod, coiled wire and rolled foil preform stock supplied soft for easy shaping. | 65 | 145 | 8 | 50 HB | 38 % IACS |
AS-BRAZEDDefault filler deposit after vacuum/flux-free braze cycle | Default condition: properties of the solidified fillet/joint after a 588–604 °C vacuum braze cycle. | 90 | 170 | 3 | 60 HB | 37 % IACS |
Strain hardened, half hard | Choose when the filler is rolled as the clad layer of vacuum brazing sheet or supplied as stiffer strip for stamped preforms. | 150 | 195 | 3 | 70 HB | 37 % IACS |
What is BAlSi-11-O?
BAlSi-11-O is BAlSi-11 in the O temper — choose for hand-fed rod, coiled wire and rolled foil preform stock supplied soft for easy shaping. BAlSi-11-O has a yield strength of 65 MPa (9.43 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 92% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi). BAlSi-11-O has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 559°C (1,038 °F). AS-BRAZED is the default condition FabDigit quotes; O is available on request or by drawing note.
Limitations
- Hard to polish — 35/100, worse than 98% of aluminum grades
- Low strength — 65 MPa (9.43 ksi), worse than 92% of aluminum grades
- Difficult to machine — 35/100, worse than 86% of aluminum grades
- Low fracture toughness — 17 MPa·√m (15.5 ksi·√in), worse than 83% of aluminum grades
BAlSi-11-O properties
Typical room-temperature values for BAlSi-11-O; 17 are specific to this condition. Other listed values are BAlSi-11 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
BAlSi-11-O has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 559°C (1,038 °F).
Mechanical15
BAlSi-11-O has a yield strength of 65 MPa (9.43 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 92% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
BAlSi-11-O is rated for continuous service to 150°C (302 °F). It conducts heat at 135 W/m·K (78 BTU/hr·ft·°F), worse than 58% of aluminum grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
BAlSi-11-O conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of BAlSi-11-O takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 10%.
Manufacturability8
BAlSi-11-O's machinability is fair (35/100, worse than 86% of aluminum grades); weldability poor (30/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BAlSi-11-O
Is BAlSi-11 easy to machine?
Rarely machined as a bulk product; braze fillets are abrasive from primary Si — use sharp polished-flute carbide, high speed and generous lubricant to avoid smearing.
Can BAlSi-11 be welded?
Not a structural welding filler — the high Mg plus Bi content is intended for brazing; arc welding of the deposit causes Mg loss and porosity.
Can BAlSi-11 be formed, bent or molded?
Supplied as rolled foil/clad layer or drawn wire; anneal between passes since the near-eutectic Si structure work-hardens and cracks quickly in cold forming.
What surface finishes work on BAlSi-11?
Anodizes dark and blotchy because of the Si and Bi phases; for cosmetic assemblies use chemical conversion coating or paint rather than clear anodize.
BAlSi-11 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 |
|---|---|---|
| Simelting-point depressant, near-eutectic flow | 9 – 10.5 | 9.8 |
| Mgoxide-disrupting getter for vacuum brazing | 1 – 2 | 1.5 |
| Bilowers surface tension, improves flow without flux | 0.02 – 0.2 | 0.1 |
| Feimpurity limit | ≤ 0.8 | — |
| Cuimpurity limit | ≤ 0.25 | — |
| Mnimpurity limit | ≤ 0.1 | — |
| Znimpurity limit | ≤ 0.2 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
BAlSi-11-O — frequently asked
What is BAlSi-11-O used for?
BAlSi-11-O is typically used for flux-free vacuum brazing of aluminum assemblies, specialty heat exchanger cores, brazing preforms and rings, clad foil layers on brazing sheet, vacuum-brazed cold plates and manifolds and powder and paste braze deposits. In short: bismuth-modified vacuum braze filler; no flux required; low-ductility brittle deposit.
What is the yield strength of BAlSi-11-O?
BAlSi-11-O has a typical yield strength of 65 MPa (9.43 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 92% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is BAlSi-11-O easy to machine?
Not especially — machinability is rated fair (35/100, worse than 86% of aluminum grades). Rarely machined as a bulk product; braze fillets are abrasive from primary Si — use sharp polished-flute carbide, high speed and generous lubricant to avoid smearing.
Can BAlSi-11-O be welded?
Not readily — weldability is rated poor (30/100). Not a structural welding filler — the high Mg plus Bi content is intended for brazing; arc welding of the deposit causes Mg loss and porosity.
What surface finishes work on BAlSi-11-O?
Anodizes dark and blotchy because of the Si and Bi phases; for cosmetic assemblies use chemical conversion coating or paint rather than clear anodize.
Can BAlSi-11-O be formed, bent or molded?
Supplied as rolled foil/clad layer or drawn wire; anneal between passes since the near-eutectic Si structure work-hardens and cracks quickly in cold forming.
What is the maximum service temperature of BAlSi-11-O?
BAlSi-11-O 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-11 AS-BRAZED and BAlSi-11-H14?
AS-BRAZED is the default condition — default condition: properties of the solidified fillet/joint after a 588–604 °C vacuum braze cycle. H14: choose when the filler is rolled as the clad layer of vacuum brazing sheet or supplied as stiffer strip for stamped preforms. Yield strength is 90 MPa in AS-BRAZED versus 150 MPa in H14.
Sources
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- AWS Brazing Handbook, 5th ed. — Aluminum and Aluminum Alloys — American Welding Society (2007)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
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.