Aluminum 3203-H24
Temper
AA 3203 · EN AW-3203, AW 3203
H24 = strain hardened and partially annealed, half hard
Most common fin/tube-stock temper: H14 strength with H12-like bendability after partial anneal.
Values for the H24 condition
Other 3203 tempers and conditions
3203 is listed in 13 conditions; see the grade overview at 3203.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for deep drawing, tight bending, fin-forming and for brazing-sheet core where post-braze softness is accepted. | 42 | 110 | 35 | 28 HB | 50 % IACS |
Slightly strain hardened | Near-O softness with slight flattening/levelling work; used where O flatness is insufficient but formability must stay high. | 50 | 115 | 28 | 30 HB | 49 % IACS |
As fabricated | Extruded or hot-worked product with no mechanical property guarantee; cheapest route for tube and shapes. | 55 | 115 | 25 | 30 HB | 46 % IACS |
Strain hardened from hot working only | Hot-rolled plate / extruded tube with guaranteed minimum properties; typical for thicker sections. | 60 | 120 | 22 | 32 HB | 47 % IACS |
Strain hardened and partially annealed, quarter hard | H12-level strength with markedly better ductility; preferred for stamped and roll-formed heat-exchanger parts. | 115 | 140 | 14 | 35 HB | 43 % IACS |
Strain hardened, quarter hard | Light work hardening for roll-formed and moderately bent parts needing a bit more strength than O. | 124 | 131 | 10 | 35 HB | 42 % IACS |
H24This page Strain hardened and partially annealed, half hard | Most common fin/tube-stock temper: H14 strength with H12-like bendability after partial anneal. | 130 | 152 | 12 | 40 HB | 42 % IACS |
H14Default Strain hardened, half hard | The general-purpose stocked sheet/tube temper: good strength–formability balance for heat-exchanger tube, panels and fin stock. | 145 | 150 | 8 | 40 HB | 41 % IACS |
Strain hardened and partially annealed, three-quarter hard | For strip needing H16 strength but some residual bend ductility. | 160 | 180 | 8 | 47 HB | 41 % IACS |
Strain hardened, three-quarter hard | Higher-strength strip for lightly formed parts, shutters and tube where stiffness matters more than bendability. | 172 | 179 | 5 | 47 HB | 40 % IACS |
Strain hardened and partially annealed, full hard | Full-hard strength with a stabilised, slightly more ductile structure than H18. | 180 | 200 | 5 | 54 HB | 40 % IACS |
Strain hardened, full hard | Maximum work-hardened strength for flat blanks, fin stock and thin strip with minimal forming. | 186 | 200 | 4 | 55 HB | 40 % IACS |
Strain hardened, extra hard | Ultra-cold-rolled thin strip/foil stock where peak as-rolled strength and flatness are needed. | 200 | 215 | 3 | 58 HB | 40 % IACS |
What is 3203-H24?
3203-H24 is 3203 in the H24 temper — most common fin/tube-stock temper: H14 strength with H12-like bendability after partial anneal. 3203-H24 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 152 MPa (22 ksi) — weaker than 73% of aluminum grades. Elongation at break is 12% and the elastic modulus is 69 GPa (10 Msi). 3203-H24 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 643°C (1,189 °F). H14 is the default condition FabDigit quotes; H24 is available on request or by drawing note.
Advantages
- Forms and bends easily — 75/100, better than 86% of aluminum grades
- Readily welded — 88/100, better than 85% of aluminum grades
- High electrical conductivity — 42 % IACS, better than 81% of aluminum grades
- Good corrosion resistance — 70/100, better than 79% of aluminum grades
- Conducts heat well — 163 W/m·K (94.2 BTU/hr·ft·°F), better than 77% of aluminum grades
Limitations
- Hard to polish — 45/100, worse than 76% of aluminum grades
3203-H24 properties
Typical room-temperature values for 3203-H24; 18 are specific to this condition. Other listed values are 3203 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
3203-H24 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 643°C (1,189 °F).
Mechanical10
3203-H24 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 152 MPa (22 ksi) — weaker than 73% of aluminum grades. Elongation at break is 12% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
3203-H24 is rated for continuous service to 150°C (302 °F). It conducts heat at 163 W/m·K (94.2 BTU/hr·ft·°F), better than 77% of aluminum grades. Thermal expansion is 23.2 µm/m·K (12.9 µin/in·°F).
Electrical3
3203-H24 conducts electricity at 42 % IACS, better than 81% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 79% of aluminum grades.
Sustainability4
Producing a kilogram of 3203-H24 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability7
3203-H24's machinability is fair (45/100, worse than 72% of aluminum grades); weldability excellent (88/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 3203-H24
Is 3203 easy to machine?
Soft and gummy — use polished high-rake carbide, high surface speed, sharp tools and flood coolant to avoid built-up edge; harder H16/H18 tempers cut cleaner.
Can 3203 be welded?
Readily GTAW/GMAW welded with 1100 or 4043 filler (4047 for brazing-sheet assemblies); weld zone reverts to O-temper strength.
Can 3203 be formed, bent or molded?
Excellent cold formability in O/H22/H24 — deep drawing, fin corrugation and tube rolling are routine; allow larger bend radii in H16–H19.
What surface finishes work on 3203?
Takes chromate/no-chrome conversion coatings and paint well; clear anodize is protective but grey-toned, so use for functional rather than decorative finishes.
3203 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 |
|---|---|---|
| SiSi+Fe controlled in fin stock | ≤ 0.6 | 0.25 |
| Fe | ≤ 0.7 | 0.45 |
| Cukey difference vs 3003 (Cu 0.05–0.20) | ≤ 0.05 | 0.02 |
| Mnprimary strengthening/dispersoid element | 1 – 1.5 | 1.2 |
| Zn | ≤ 0.1 | 0.03 |
| Tigrain refiner (where registered) | ≤ 0.1 | 0.02 |
| Other (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
3203-H24 — frequently asked
What is 3203-H24 used for?
3203-H24 is typically used for brazed heat exchanger fin stock, heat exchanger tube stock, brazing sheet core, radiator and condenser assemblies, cooking utensils and roofing and siding sheet. In short: international 3003 equivalent; general purpose.
What is the yield strength of 3203-H24?
3203-H24 has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 152 MPa (22 ksi) — weaker than 73% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 3203-H24 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 72% of aluminum grades). Soft and gummy — use polished high-rake carbide, high surface speed, sharp tools and flood coolant to avoid built-up edge; harder H16/H18 tempers cut cleaner.
Can 3203-H24 be welded?
Yes — weldability is rated excellent (88/100). Readily GTAW/GMAW welded with 1100 or 4043 filler (4047 for brazing-sheet assemblies); weld zone reverts to O-temper strength.
What surface finishes work on 3203-H24?
Takes chromate/no-chrome conversion coatings and paint well; clear anodize is protective but grey-toned, so use for functional rather than decorative finishes.
Can 3203-H24 be formed, bent or molded?
Excellent cold formability in O/H22/H24 — deep drawing, fin corrugation and tube rolling are routine; allow larger bend radii in H16–H19.
What is the maximum service temperature of 3203-H24?
3203-H24 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 3203-H14 and 3203-O?
H14 is the default condition — the general-purpose stocked sheet/tube temper: good strength–formability balance for heat-exchanger tube, panels and fin stock. O: pick for deep drawing, tight bending, fin-forming and for brazing-sheet core where post-braze softness is accepted. Yield strength is 145 MPa in H14 versus 42 MPa in O.
Can FabDigit make parts in 3203-H24?
Yes — 3203-H24 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)
- EN 573-3 / EN 485-2 — Aluminium and aluminium alloys: chemical composition and mechanical properties of sheet, strip and plate — CEN (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (3003/3000-series data) — ASM International (1990)
- ASTM B209 — Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate — ASTM International (2021)
- Heat-exchanger tube and fin stock alloy datasheets (3003/3203 class) — Constellium / Novelis (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.