Aluminum 4007-H28
Supply condition
AA 4007 · UNS A94007 · EN AW-4007, AlSi1.5Mn
H28 = strain hardened and partially annealed, full hard
Full-hard stabilised thin strip/foil for flat, high-strength applications.
Values for the H28 condition
Other 4007 tempers and conditions
4007 is listed in 11 conditions; see the grade overview at 4007.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Pick for maximum formability: deep drawing, stretch forming and foil/clad-sheet stock before brazing. | 65 | 150 | 27 | 42 HB | 40 % IACS |
As fabricated | Mill condition for hot-rolled plate and re-roll coil where properties are not guaranteed. | 75 | 155 | 22 | 44 HB | 40 % IACS |
Slightly strain hardened | Standard as-supplied condition for EN sheet/plate that has seen only levelling or straightening after annealing; nearly O formability with slightly higher yield. | 85 | 160 | 22 | 46 HB | 40 % IACS |
Strain hardened and partially annealed, quarter hard | Stabilised quarter-hard strip when better ductility than H12 at similar strength is required. | 135 | 180 | 11 | 50 HB | 40 % IACS |
Strain hardened, quarter hard | Choose when moderate bending/roll-forming ability must be combined with roughly double the annealed yield strength. | 150 | 185 | 9 | 52 HB | 39 % IACS |
Strain hardened and partially annealed, half hard | The usual half-hard supply condition for formed sheet parts; more bend-friendly than H14. | 160 | 200 | 8 | 56 HB | 39.5 % IACS |
Strain hardened, half hard | General-purpose semi-hard strip for lightly loaded panels and fins that need only gentle bends. | 175 | 205 | 6 | 58 HB | 39 % IACS |
Strain hardened and partially annealed, three-quarter hard | High-strength stabilised strip with residual bendability for roll-formed profiles. | 185 | 220 | 5 | 62 HB | 39 % IACS |
Strain hardened, three-quarter hard | For flat or roll-formed parts needing high strength and stiffness with minimal forming. | 200 | 225 | 4 | 64 HB | — |
H28This page Strain hardened and partially annealed, full hard | Full-hard stabilised thin strip/foil for flat, high-strength applications. | 220 | 245 | 3 | 68 HB | 39 % IACS |
Strain hardened, full hard | Maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation. | 230 | 250 | 3 | 70 HB | 158 W/m·K |
What is 4007-H28?
4007-H28 is 4007 supplied in the H28 condition — full-hard stabilised thin strip/foil for flat, high-strength applications. 4007-H28 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi). 4007-H28 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 625°C (1,157 °F). O is the default condition FabDigit quotes; H28 is available on request or by drawing note.
Advantages
- Conducts heat well — 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades
Limitations
- Limited service temperature — 110°C (230 °F), worse than 89% of aluminum grades
- Limited ductility — 3%, worse than 79% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
4007-H28 properties
Typical room-temperature values for 4007-H28; 19 are specific to this condition. Other listed values are 4007 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4007-H28 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 625°C (1,157 °F).
Mechanical12
4007-H28 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
4007-H28 is rated for continuous service to 110°C (230 °F). It conducts heat at 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
4007-H28 conducts electricity at 39 % IACS, better than 65% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of 4007-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
4007-H28's machinability is good (64/100, better than 58% of aluminum grades); weldability good (55/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4007-H28
Is 4007 easy to machine?
Machines like a soft Al-Mn sheet alloy: use polished high-rake carbide, high speed and flood lubrication to avoid built-up edge; hard tempers chip-break better than O.
Can 4007 be welded?
GTAW/GMAW with 4043 or 4047 filler and resistance/laser welding work well; avoid autogenous fusion of thin cold-worked strip because of hot-cracking and full local softening of the HAZ.
Can 4007 be formed, bent or molded?
Excellent cold formability in O/H111 (deep drawing, fin corrugating, bending to tight radii); H16–H18 tolerate only large-radius bends and should be bent across the rolling direction.
What surface finishes work on 4007?
Prefer chemical conversion coating, chromate-free pretreat plus paint, or brazing-flux compatible surfaces; decorative anodizing gives dark grey mottling because of Si/Mn/Ni intermetallics.
4007 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 strengthening/eutectic former | 1 – 1.7 | 1.4 |
| Fe | 0.4 – 1 | 0.7 |
| Cu | ≤ 0.2 | 0.05 |
| Mndispersoid former, raises strength | 0.8 – 1.5 | 1.2 |
| Mg | ≤ 0.2 | 0.05 |
| Cr | 0.05 – 0.25 | 0.15 |
| Nithermal stability | 0.15 – 0.7 | 0.35 |
| Zn | ≤ 0.1 | — |
| Ti | ≤ 0.1 | — |
| Others (each)0.15 % total | ≤ 0.05 | — |
| Al | balance | — |
4007-H28 — frequently asked
What is 4007-H28 used for?
4007-H28 is typically used for foil stock, fin stock and thin gauge sheet. In short: stronger than 1000-series foil; high-formability fin alloy; not heat treatable.
What is the yield strength of 4007-H28?
4007-H28 has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 245 MPa (35.5 ksi) — stronger than 59% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 4007-H28 easy to machine?
Reasonably — machinability is rated good (64/100, better than 58% of aluminum grades). Machines like a soft Al-Mn sheet alloy: use polished high-rake carbide, high speed and flood lubrication to avoid built-up edge; hard tempers chip-break better than O.
Can 4007-H28 be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW with 4043 or 4047 filler and resistance/laser welding work well; avoid autogenous fusion of thin cold-worked strip because of hot-cracking and full local softening of the HAZ.
What surface finishes work on 4007-H28?
Prefer chemical conversion coating, chromate-free pretreat plus paint, or brazing-flux compatible surfaces; decorative anodizing gives dark grey mottling because of Si/Mn/Ni intermetallics.
Can 4007-H28 be formed, bent or molded?
Excellent cold formability in O/H111 (deep drawing, fin corrugating, bending to tight radii); H16–H18 tolerate only large-radius bends and should be bent across the rolling direction.
What is the maximum service temperature of 4007-H28?
4007-H28 is rated for continuous use to about 110°C (230 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 4007-O and 4007-H18?
O is the default condition — pick for maximum formability: deep drawing, stretch forming and foil/clad-sheet stock before brazing. H18: maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation. Yield strength is 65 MPa in O versus 230 MPa in H18.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- EN 573-3 Aluminium and aluminium alloys — Chemical composition and form of wrought products — CEN (2019)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate — Mechanical properties — CEN (2016)
- 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.