Aluminum 5449-H28
Supply condition
AA 5449 · UNS A95449
H28 = strain hardened and partially annealed, full hard
Highest-strength strip temper for flat or lightly bent parts; forming is limited to gentle radii.
Values for the H28 condition
Other 5449 tempers and conditions
5449 is listed in 6 conditions; see the grade overview at 5449.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Pick for maximum drawability and stretch forming of complex body panels; skin-pass or temper-roll to avoid Lüders lines. | 95 | 210 | 24 | 55 HB | 34 % IACS |
Slightly strain hardened | Standard as-supplied condition for coil/plate that receives slight straightening or levelling after annealing; properties essentially O-level. | 100 | 215 | 22 | 58 HB | 34 % IACS |
Strain hardened and partially annealed, quarter hard | Choose when moderate strength is needed but the part still requires bending and moderate drawing. | 165 | 245 | 12 | 68 HB | 33 % IACS |
Strain hardened and partially annealed, half hard | Common structural/body-panel temper: good balance of dent resistance, bendability and strength. | 200 | 265 | 9 | 75 HB | 33 % IACS |
Strain hardened and partially annealed, three-quarter hard | Use where higher yield strength and stiffness-per-gauge matter more than forming, e.g. flat reinforcements and brackets. | 230 | 285 | 6 | 82 HB | 32 % IACS |
H28This page Strain hardened and partially annealed, full hard | Highest-strength strip temper for flat or lightly bent parts; forming is limited to gentle radii. | 260 | 305 | 4 | 88 HB | 32 % IACS |
What is 5449-H28?
5449-H28 is 5449 supplied in the H28 condition — highest-strength strip temper for flat or lightly bent parts; forming is limited to gentle radii. 5449-H28 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 305 MPa (44.2 ksi) — stronger than 68% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi). 5449-H28 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 610°C (1,130 °F). O is the default condition FabDigit quotes; H28 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 74/100, better than 87% of aluminum grades
Limitations
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
5449-H28 properties
Typical room-temperature values for 5449-H28; 12 are specific to this condition. Other listed values are 5449 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
5449-H28 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 610°C (1,130 °F).
Mechanical10
5449-H28 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 305 MPa (44.2 ksi) — stronger than 68% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
5449-H28 is rated for continuous service to 100°C (212 °F). It conducts heat at 137 W/m·K (79.2 BTU/hr·ft·°F), worse than 57% of aluminum grades. Thermal expansion is 23.7 µm/m·K (13.2 µin/in·°F).
Electrical3
5449-H28 conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 87% of aluminum grades.
Sustainability4
Producing a kilogram of 5449-H28 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
5449-H28's machinability is fair (50/100, worse than 65% of aluminum grades); weldability very good (80/100); formability fair (42/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 5449-H28
Is 5449 easy to machine?
Machines like other soft 5000-series sheet — use sharp polished high-rake carbide tools, high speed and flood lubrication to prevent built-up edge and burring.
Can 5449 be welded?
Readily GMAW/GTAW, resistance spot and laser welded with 5356 or 5183 filler; HAZ softens to near-O strength in H2x tempers.
Can 5449 be formed, bent or molded?
Excellent deep drawing, stretch forming and hemming in O/H111; the high n-value gives good strain distribution, but temper-roll or pre-strain to suppress Lüders bands and allow bake response.
What surface finishes work on 5449?
Takes clear and colour anodize well, and is a good substrate for conversion coating, e-coat and automotive paint systems; mechanical polish before anodizing for bright finishes.
5449 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 |
|---|---|---|
| Si | ≤ 0.4 | 0.15 |
| Fe | ≤ 0.5 | 0.3 |
| Cu | ≤ 0.15 | 0.05 |
| Mndispersoid former, grain-size control | 0.6 – 1.1 | 0.8 |
| Mgprincipal solid-solution strengthener | 1.6 – 2.6 | 2 |
| Cr | ≤ 0.3 | 0.05 |
| Zn | ≤ 0.2 | 0.05 |
| Ti | ≤ 0.1 | 0.02 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
5449-H28 — frequently asked
What is 5449-H28 used for?
5449-H28 is typically used for automotive body sheet, structural inner panels and formed brackets. In short: formability-first automotive sheet; high n-value Al-Mg; good dent resistance.
What is the yield strength of 5449-H28?
5449-H28 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 305 MPa (44.2 ksi) — stronger than 68% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 5449-H28 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 65% of aluminum grades). Machines like other soft 5000-series sheet — use sharp polished high-rake carbide tools, high speed and flood lubrication to prevent built-up edge and burring.
Can 5449-H28 be welded?
Yes — weldability is rated very good (80/100). Readily GMAW/GTAW, resistance spot and laser welded with 5356 or 5183 filler; HAZ softens to near-O strength in H2x tempers.
What surface finishes work on 5449-H28?
Takes clear and colour anodize well, and is a good substrate for conversion coating, e-coat and automotive paint systems; mechanical polish before anodizing for bright finishes.
Can 5449-H28 be formed, bent or molded?
Excellent deep drawing, stretch forming and hemming in O/H111; the high n-value gives good strain distribution, but temper-roll or pre-strain to suppress Lüders bands and allow bake response.
What is the maximum service temperature of 5449-H28?
5449-H28 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 5449-O and 5449-H28?
O is the default condition — pick for maximum drawability and stretch forming of complex body panels; skin-pass or temper-roll to avoid Lüders lines. H28: highest-strength strip temper for flat or lightly bent parts; forming is limited to gentle radii. Yield strength is 95 MPa in O versus 260 MPa in H28.
Sources
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate — Mechanical properties — CEN (2016)
- EN 573-3 Chemical composition of wrought aluminium alloys — CEN (2019)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.