Aluminum 4045-H26
Supply condition
AA 4045 · UNS A94045 · EN AW-4045, AW 4045
H26 = strain hardened and partially annealed, three-quarter hard
Stabilized three-quarter hard strip balancing strength and residual formability.
Values for the H26 condition
Other 4045 tempers and conditions
4045 is listed in 10 conditions; see the grade overview at 4045.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Default stock condition for brazing sheet cladding and formed heat-exchanger parts requiring maximum ductility before the braze cycle. | 45 | 110 | 20 | 30 HB | 41 % IACS |
As fabricated | Use for braze rod, wire and cast/hot-worked stock where no mechanical property limits are guaranteed. | 55 | 115 | 12 | 33 HB | 40 % IACS |
after furnace/CAB braze cycle (fillet metal) | Condition of the solidified 4045 fillet/clad after a 590–605 °C braze cycle; coarse Si structure, essentially annealed. | 60 | 130 | 6 | 40 HB | 38 % IACS |
Strain hardened and partially annealed, quarter hard | Stabilized quarter-hard strip with better ductility than H12 at similar strength. | 100 | 130 | 12 | 36 HB | 40 % IACS |
Strain hardened, quarter hard | Light cold work for slightly stiffer clad sheet that still forms readily. | 110 | 135 | 9 | 38 HB | 40 % IACS |
Strain hardened and partially annealed, half hard | Preferred half-hard temper for brazing sheet that must be roll-formed or stamped before the furnace cycle. | 125 | 155 | 8 | 43 HB | 40 % IACS |
Strain hardened, half hard | Most common as-rolled hard condition for fin and tube brazing sheet needing coil handling stiffness. | 145 | 165 | 5 | 45 HB | 40 % IACS |
H26This page Strain hardened and partially annealed, three-quarter hard | Stabilized three-quarter hard strip balancing strength and residual formability. | 155 | 180 | 5 | 50 HB | 40 % IACS |
Strain hardened, three-quarter hard | Higher strength coil for stiff, lightly formed fin stock. | 170 | 190 | 3 | 52 HB | 40 % IACS |
Strain hardened, full hard | Maximum cold-rolled strength; used where flat, springy strip is slit and only bent to large radii. | 195 | 215 | 2 | 58 HB | 40 % IACS |
What is 4045-H26?
4045-H26 is 4045 supplied in the H26 condition — stabilized three-quarter hard strip balancing strength and residual formability. 4045-H26 has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 63% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi). 4045-H26 has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 577°C (1,071 °F).
Advantages
- Conducts heat well — 163 W/m·K (94.2 BTU/hr·ft·°F), better than 77% of aluminum grades
Limitations
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Difficult to machine — 42/100, worse than 77% of aluminum grades
4045-H26 properties
Typical room-temperature values for 4045-H26; 19 are specific to this condition. Other listed values are 4045 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4045-H26 has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 577°C (1,071 °F).
Mechanical10
4045-H26 has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 63% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
4045-H26 is rated for continuous service to 130°C (266 °F). It conducts heat at 163 W/m·K (94.2 BTU/hr·ft·°F), better than 77% of aluminum grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
4045-H26 conducts electricity at 40 % IACS, better than 72% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 58% of aluminum grades.
Sustainability4
Producing a kilogram of 4045-H26 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
4045-H26's machinability is fair (42/100, worse than 77% of aluminum grades); weldability good (68/100); formability fair (44/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4045-H26
Is 4045 easy to machine?
Primary silicon is very abrasive — use PCD or polished-flute carbide, high speed, low feed and flood coolant; expect gummy chips in the O temper.
Can 4045 be welded?
Rarely welded as a base metal; it is itself a filler (BAlSi-5) for GTAW/GMAW/torch brazing of 1000 series, 3000 and 6000 series alloys, and re-melts in furnace/CAB braze cycles at 590–605 °C.
Can 4045 be formed, bent or molded?
Form in O or H24 before brazing; heavy H16/H18 tempers crack on tight bends, and post-braze material is soft and easily distorted.
What surface finishes work on 4045?
Chemical/mechanical cleaning and flux removal are the norm; anodizing gives dark grey non-decorative films, so painting or chromate/Zr conversion coating is preferred.
4045 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 braze-filler element, lowers melting range | 9 – 11 | 10 |
| Fe | ≤ 0.8 | 0.35 |
| Cu | ≤ 0.3 | 0.05 |
| Mn | ≤ 0.05 | 0.02 |
| Mgkept low for controlled-atmosphere (NOCOLOK) brazing | ≤ 0.05 | 0.01 |
| Zn | ≤ 0.1 | 0.02 |
| Ti | ≤ 0.2 | 0.02 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
4045-H26 — frequently asked
What is 4045-H26 used for?
4045-H26 is typically used for brazing sheet clad layer over 3003/3005 core, automotive radiator and condenser assemblies, evaporator plates and tube stock, heat exchanger fin stock, oil cooler plates and BAlSi-5 braze filler wire and rod. In short: brazing sheet skin alloy; 10% Si.
What is the yield strength of 4045-H26?
4045-H26 has a typical yield strength of 155 MPa (22.5 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 63% of aluminum grades. Strength varies by condition: see the 10 listed tempers.
Is 4045-H26 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 77% of aluminum grades). Primary silicon is very abrasive — use PCD or polished-flute carbide, high speed, low feed and flood coolant; expect gummy chips in the O temper.
Can 4045-H26 be welded?
Yes — weldability is rated good (68/100). Rarely welded as a base metal; it is itself a filler (BAlSi-5) for GTAW/GMAW/torch brazing of 1000 series, 3000 and 6000 series alloys, and re-melts in furnace/CAB braze cycles at 590–605 °C.
What surface finishes work on 4045-H26?
Chemical/mechanical cleaning and flux removal are the norm; anodizing gives dark grey non-decorative films, so painting or chromate/Zr conversion coating is preferred.
Can 4045-H26 be formed, bent or molded?
Form in O or H24 before brazing; heavy H16/H18 tempers crack on tight bends, and post-braze material is soft and easily distorted.
What is the maximum service temperature of 4045-H26?
4045-H26 is rated for continuous use to about 130°C (266 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 4045-H26?
Yes — 4045-H26 is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASTM B209 / B209M — Aluminum and Aluminum-Alloy Sheet and Plate — ASTM International (2021)
- AWS A5.10/A5.10M — Filler Metals for Aluminum and Aluminum Alloys (BAlSi-5) — American Welding Society (2021)
- EN 573-3 / EN 485-2 — Wrought aluminium: composition and mechanical properties of sheet — CEN (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminium brazing sheet (4045 clad on 3003 core) product data — Aluminium brazing-sheet producers (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.