Aluminum 1100-H28
Supply condition
AA 1100 · UNS A91100 · ASTM AWS A5.10 ER1100 · EN Al99.0Cu, AW-1100 · JIS A1100, A1100WY
H28 = strain hardened and partially annealed, full hard
Full-hard strength with stabilised, flat coil for high-speed stamping.
Values for the H28 condition
Other 1100 tempers and conditions
1100 is listed in 12 conditions; see the grade overview at 1100.
Compare all 12 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum ductility — deep drawing, spinning, severe bending and highest conductivity. | 34 | 90 | 40 | 23 HB | 59 % IACS |
Strain hardened from hot working only | Standard temper for thick 1100 plate and extruded shapes where cold rolling is not applicable. | 45 | 95 | 25 | 25 HB | 59 % IACS |
Strain hardened, hot-rolled plate temper | Commercially pure 1100 aluminium supplied as hot-rolled plate with a small amount of incidental strain hardening, giving strength just above the annealed condition while retaining excellent formability, weldability and conductivity. | 90 | 110 | 14 | 28 HB | 58.5 % IACS |
Strain hardened and partially annealed, quarter hard | Same strength class as H12 but with better ductility and flatness stability from the partial anneal. | 90 | 110 | 20 | 27 HB | 58 % IACS |
Strain hardened and partially annealed, half hard | H14-level strength with extra forming reserve — common for deep-drawn and spun 1100 parts. | 100 | 125 | 15 | 31 HB | 57 % IACS |
Strain hardened, quarter hard | Light cold work — a compromise when O is too floppy but forming is still moderately severe. | 105 | 110 | 17 | 28 HB | 57 % IACS |
Strain hardened, half hard | The default stock temper for 1100 sheet and coil — usable strength with still-excellent bending and welding. | 115 | 125 | 12 | 32 HB | 57 % IACS |
Strain hardened and partially annealed, three-quarter hard | H16 strength level with improved bend behaviour for roll-formed profiles. | 125 | 145 | 11 | 37 HB | 57 % IACS |
Strain hardened, three-quarter hard | Choose when a stiffer, more dent-resistant panel is needed and only gentle bends are required. | 140 | 145 | 9 | 38 HB | 57 % IACS |
H28This page Strain hardened and partially annealed, full hard | Full-hard strength with stabilised, flat coil for high-speed stamping. | 145 | 165 | 7 | 43 HB | 57 % IACS |
Strain hardened, full hard | Maximum cold-worked strength for flat parts, foil stock and stampings needing springiness rather than bendability. | 150 | 165 | 6 | 44 HB | 57 % IACS |
Strain hardened, extra hard | Very heavily rolled foil and fin stock where the highest as-rolled strength is needed. | 170 | 185 | 3 | 48 HB | 57 % IACS |
What is 1100-H28?
1100-H28 is 1100 supplied in the H28 condition — full-hard strength with stabilised, flat coil for high-speed stamping. 1100-H28 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 68% of aluminum grades. Elongation at break is 7% and the elastic modulus is 69 GPa (10 Msi). 1100-H28 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °F).
Advantages
- Readily welded — 95/100, better than 99% of aluminum grades
- High electrical conductivity — 57 % IACS, better than 94% of aluminum grades
- Good corrosion resistance — 78/100, better than 94% of aluminum grades
- Conducts heat well — 218 W/m·K (126 BTU/hr·ft·°F), better than 93% of aluminum grades
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
- Difficult to machine — 43/100, worse than 76% of aluminum grades
1100-H28 properties
Typical room-temperature values for 1100-H28; 18 are specific to this condition. Other listed values are 1100 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
1100-H28 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 643°C (1,189 °F).
Mechanical11
1100-H28 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 68% of aluminum grades. Elongation at break is 7% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1100-H28 is rated for continuous service to 120°C (248 °F). It conducts heat at 218 W/m·K (126 BTU/hr·ft·°F), better than 93% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1100-H28 conducts electricity at 57 % IACS, better than 94% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 1100-H28 takes about 210 MJ of energy and emits 12.5 kg of CO₂ — more than 88% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
1100-H28's machinability is fair (43/100, worse than 76% of aluminum grades); weldability excellent (95/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1100-H28
Is 1100 easy to machine?
Very gummy — use sharp polished high-rake carbide, high surface speed, generous flood or mist lubrication and large chip clearance to avoid built-up edge; harder H16/H18 tempers finish noticeably better.
Can 1100 be welded?
Excellent by GTAW/GMAW/resistance and brazing; use ER1100 (or ER4043 where cracking is a concern) and accept that the HAZ reverts to O-temper strength.
Can 1100 be formed, bent or molded?
Outstanding cold formability — deep draws, spinning and tight bends (≈0–1 t bend radius in O/H12); anneal at 340–400 °C between severe forming steps.
What surface finishes work on 1100?
Anodizes bright and clear, takes dyes evenly, buffs to a high specular reflector finish, and accepts chromate/chemical conversion, paint and electroplating well.
1100 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+Fecombined Si plus Fe limit per AA/ASTM B209 | ≤ 0.95 | — |
| Cuintentional addition for strength | 0.05 – 0.2 | 0.12 |
| Mn | ≤ 0.05 | — |
| Zn | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al99.00 % minimum aluminium | ≥ 99 (balance) | — |
1100-H28 — frequently asked
What is 1100-H28 used for?
1100-H28 is typically used for heat-exchanger fins, deep-drawn and spun parts, chemical vessels and tank liners, lighting reflectors, nameplates and signage and ER1100 welding and brazing filler. In short: ultra-soft; maximum conductivity.
What is the yield strength of 1100-H28?
1100-H28 has a typical yield strength of 145 MPa (21 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 68% of aluminum grades. Strength varies by condition: see the 12 listed tempers.
Is 1100-H28 easy to machine?
Not especially — machinability is rated fair (43/100, worse than 76% of aluminum grades). Very gummy — use sharp polished high-rake carbide, high surface speed, generous flood or mist lubrication and large chip clearance to avoid built-up edge; harder H16/H18 tempers finish noticeably better.
Can 1100-H28 be welded?
Yes — weldability is rated excellent (95/100). Excellent by GTAW/GMAW/resistance and brazing; use ER1100 (or ER4043 where cracking is a concern) and accept that the HAZ reverts to O-temper strength.
What surface finishes work on 1100-H28?
Anodizes bright and clear, takes dyes evenly, buffs to a high specular reflector finish, and accepts chromate/chemical conversion, paint and electroplating well.
Can 1100-H28 be formed, bent or molded?
Outstanding cold formability — deep draws, spinning and tight bends (≈0–1 t bend radius in O/H12); anneal at 340–400 °C between severe forming steps.
What is the maximum service temperature of 1100-H28?
1100-H28 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 1100-H28?
Yes — 1100-H28 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B209 / B209M — Aluminum and Aluminum-Alloy Sheet and Plate — ASTM International (2021)
- 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 and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- JIS H 4000 — Aluminium and aluminium alloy sheets, strips and plates — JSA (2014)
- MMPDS-style typical mechanical property tables for 1000-series wrought products — Battelle / FAA (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.