Aluminum 4147-O (Annealed)
Temper · default condition
AA 4147 · EN AW-4147, AlSi11Cu3
Standard soft-drawn/annealed condition for brazing wire, preforms, foil and brazing-sheet cladding; pick it for any brazing consumable.
Values for the O condition
Other 4147 tempers and conditions
4147 is listed in 4 conditions; see the grade overview at 4147.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefaultThis page Annealed | Standard soft-drawn/annealed condition for brazing wire, preforms, foil and brazing-sheet cladding; pick it for any brazing consumable. | 60 | 130 | 15 | 45 HB | 40 % IACS |
As fabricated | As-cast ingot or as-extruded rod with no thermal or mechanical control; used for remelt stock and powder/paste feedstock. | 90 | 170 | 6 | 55 HB | 39 % IACS |
solidified filler in the joint | Condition of the filler after it has melted and resolidified in a joint; use these numbers for joint strength checks, not the wire properties. | 90 | 160 | 3 | 55 HB | 37 % IACS |
Strain hardened, half hard | Cold-drawn stiffer wire chosen when spooled or hand-fed rod must resist bending during automated brazing; values are indicative only. | 140 | 175 | 5 | 60 HB | 40 % IACS |
What is 4147-O?
4147-O is 4147 in the O temper — standard soft-drawn/annealed condition for brazing wire, preforms, foil and brazing-sheet cladding; pick it for any brazing consumable. 4147-O has a yield strength of 60 MPa (8.7 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 93% of aluminum grades. Elongation at break is 15% and the elastic modulus is 71 GPa (10.3 Msi). 4147-O has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 560°C (1,040 °F).
Advantages
- Ductile — tolerates forming and impact — 15%, better than 82% 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
- Difficult to machine — 32/100, worse than 89% of aluminum grades
4147-O properties
Typical room-temperature values for 4147-O; 11 are specific to this condition. Other listed values are 4147 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4147-O has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 560°C (1,040 °F).
Mechanical12
4147-O has a yield strength of 60 MPa (8.7 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 93% of aluminum grades. Elongation at break is 15% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
4147-O is rated for continuous service to 150°C (302 °F). It conducts heat at 155 W/m·K (89.6 BTU/hr·ft·°F), better than 71% of aluminum grades. Thermal expansion is 20 µm/m·K (11.1 µin/in·°F).
Electrical3
4147-O conducts electricity at 40 % IACS, better than 72% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of 4147-O takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
4147-O's machinability is poor (32/100, worse than 89% of aluminum grades); weldability fair (50/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4147-O
Is 4147 easy to machine?
Machinable but abrasive — use PCD or polished carbide, high speed, low feed and flood coolant; primary silicon dulls HSS quickly and gives a matte finish.
Can 4147 be welded?
Intended as a filler, not a base metal: it flows freely and resists hot cracking in Al-Si and Al-Mg-Si joints, but a resolidified bead is brittle and should not be bent or post-formed.
Can 4147 be formed, bent or molded?
Very limited cold formability; keep to wire drawing, foil rolling and cladding on brazing sheet, with interstage anneals, and avoid tight bends or deep forming.
What surface finishes work on 4147?
Chemical conversion coating, chromate-free pretreatment or paint over brazed seams; anodizing turns high-Si filler dark grey and blotchy, and Mg-bearing joints must be cleaned of flux/oxide residue before finishing.
4147 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 |
|---|---|---|
| Sinear-eutectic; sets the low melting range | 11 – 13 | 12 |
| Mgoxide getter for fluxless vacuum brazing; incompatible with NOCOLOK CAB flux | 0.1 – 0.5 | 0.3 |
| Feimpurity limit | ≤ 0.8 | — |
| Cuimpurity limit | ≤ 0.25 | — |
| Mnimpurity limit | ≤ 0.1 | — |
| Znimpurity limit | ≤ 0.2 | — |
| Others (each)others total 0.15 max | ≤ 0.05 | — |
| Al | balance | — |
4147-O — frequently asked
What is 4147-O used for?
4147-O is typically used for furnace brazing, torch brazing and aluminum assembly joining. In short: wide melting range filler; free-flowing braze alloy; brittle after resolidification.
What is the yield strength of 4147-O?
4147-O has a typical yield strength of 60 MPa (8.7 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 4147-O easy to machine?
Not especially — machinability is rated poor (32/100, worse than 89% of aluminum grades). Machinable but abrasive — use PCD or polished carbide, high speed, low feed and flood coolant; primary silicon dulls HSS quickly and gives a matte finish.
Can 4147-O be welded?
With care — weldability is rated fair (50/100). Intended as a filler, not a base metal: it flows freely and resists hot cracking in Al-Si and Al-Mg-Si joints, but a resolidified bead is brittle and should not be bent or post-formed.
What surface finishes work on 4147-O?
Chemical conversion coating, chromate-free pretreatment or paint over brazed seams; anodizing turns high-Si filler dark grey and blotchy, and Mg-bearing joints must be cleaned of flux/oxide residue before finishing.
Can 4147-O be formed, bent or molded?
Very limited cold formability; keep to wire drawing, foil rolling and cladding on brazing sheet, with interstage anneals, and avoid tight bends or deep forming.
What is the maximum service temperature of 4147-O?
4147-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 4147-O and 4147-H14?
O is the default condition — standard soft-drawn/annealed condition for brazing wire, preforms, foil and brazing-sheet cladding; pick it for any brazing consumable. H14: cold-drawn stiffer wire chosen when spooled or hand-fed rod must resist bending during automated brazing; values are indicative only. Yield strength is 60 MPa in O versus 140 MPa in H14.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding (BAlSi series) — AWS (2019)
- EN 573-3 — Aluminium and aluminium alloys, chemical composition of wrought products — CEN (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (aluminium brazing) — ASM International (1993)
- Aluminium brazing sheet and filler alloy data (Al-Si-Mg vacuum brazing cladding) — Gränges / Aleris (2022)
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.