Aluminum 1070-H22
Temper
AA 1070 · UNS A91070 · EN Al99.7, AW-1070 · JIS A1070
H22 = strain hardened and partially annealed, quarter hard
Back-annealed light temper giving H12-level strength with better ductility for forming.
Values for the H22 condition
Other 1070 tempers and conditions
1070 is listed in 11 conditions; see the grade overview at 1070.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Default stock condition for foil, deep-drawn parts, capacitor/conductor strip and anything needing maximum ductility and conductivity. | 25 | 68 | 43 | 19 HB | 59.5 % IACS |
As fabricated | Hot-rolled plate, extrusions and forgings where mechanical properties are not guaranteed. | 35 | 75 | 30 | 21 HB | 59 % IACS |
Strain hardened from hot working only | Hot-worked extrusion/plate temper of 99.7% pure aluminium retaining slight work hardening, giving strength just above annealed with very high ductility and conductivity. | 40 | 80 | 25 | 22 HB | 59 % IACS |
H22This page Strain hardened and partially annealed, quarter hard | Back-annealed light temper giving H12-level strength with better ductility for forming. | 62 | 88 | 16 | 26 HB | 59 % IACS |
Strain hardened, quarter hard | Light cold work when slightly more stiffness/handling strength is needed but forming is still required. | 70 | 85 | 12 | 25 HB | 59 % IACS |
Strain hardened and partially annealed, half hard | Half-hard sheet with restored ductility — preferred over H14 when tight bends or spinning are required. | 80 | 105 | 11 | 31 HB | 58.8 % IACS |
Strain hardened, half hard | Most common cold-worked sheet temper: better handling strength and flatness with moderate bending ability. | 92 | 105 | 8 | 30 HB | 58.8 % IACS |
Strain hardened and partially annealed, three-quarter hard | Higher-strength back-annealed strip for roll-formed and stamped parts needing some bend capability. | 100 | 120 | 7 | 34 HB | 58.6 % IACS |
Strain hardened, three-quarter hard | Choose for flat strip and stamped parts needing higher stiffness with only gentle bends. | 105 | 120 | 5 | 33 HB | 58.6 % IACS |
Strain hardened, full hard | Full-hard strip/foil for maximum work-hardened strength, springy flatness and clean blanking. | 122 | 135 | 4 | 35 HB | 58.5 % IACS |
Strain hardened, extra hard | Extra-hard drawn wire and very thin foil where maximum as-drawn strength is needed. | 140 | 155 | 2.5 | 38 HB | 58 % IACS |
What is 1070-H22?
1070-H22 is 1070 in the H22 temper — back-annealed light temper giving H12-level strength with better ductility for forming. 1070-H22 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 93% of aluminum grades. Elongation at break is 16% and the elastic modulus is 69 GPa (10 Msi). 1070-H22 has a density of 2.71 g/cm³ (0.0977 lb/in³), lighter than 54% of aluminum grades. It melts at 646°C (1,195 °F).
Advantages
- Conducts heat well — 226 W/m·K (130.6 BTU/hr·ft·°F), better than 95% of aluminum grades
- High electrical conductivity — 59 % IACS, better than 95% of aluminum grades
- Good corrosion resistance — 78/100, better than 94% of aluminum grades
- Forms and bends easily — 90/100, better than 93% of aluminum grades
- Readily welded — 90/100, better than 90% of aluminum grades
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 93% of aluminum grades
- Difficult to machine — 36/100, worse than 84% of aluminum grades
1070-H22 properties
Typical room-temperature values for 1070-H22; 18 are specific to this condition. Other listed values are 1070 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
1070-H22 has a density of 2.71 g/cm³ (0.0977 lb/in³), lighter than 54% of aluminum grades. It melts at 646°C (1,195 °F).
Mechanical10
1070-H22 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 93% of aluminum grades. Elongation at break is 16% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1070-H22 is rated for continuous service to 130°C (266 °F). It conducts heat at 226 W/m·K (130.6 BTU/hr·ft·°F), better than 95% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1070-H22 conducts electricity at 59 % IACS, better than 95% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 1070-H22 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 10%.
Manufacturability7
1070-H22's machinability is fair (36/100, worse than 84% of aluminum grades); weldability excellent (90/100); formability excellent (90/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1070-H22
Is 1070 easy to machine?
Very soft and gummy — use polished high-rake tools, sharp inserts, high speed with low feed and generous lubricant; consider H18 temper or 6061 substitution for machined parts.
Can 1070 be welded?
Excellent with TIG/MIG using 1100 or 1188 filler (1070 wire for conductor work); resistance and friction-stir welding also fine, but weld metal reverts to annealed strength.
Can 1070 be formed, bent or molded?
Outstanding deep drawing, spinning, roll forming and foil rolling in O/H2x tempers; springback is low but the material galls, so use good lubrication and polished dies.
What surface finishes work on 1070?
Anodizes to clear, bright films (standard for reflectors and bright trim); accepts chemical brightening, chromate/chrome-free conversion coating and paint, but the soft surface dents and scratches easily.
1070 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 |
|---|---|---|
| SiAA limit; EN AW-1070A limits Si 0.20 | ≤ 0.2 | 0.08 |
| Fe | ≤ 0.25 | 0.15 |
| Cu | ≤ 0.04 | 0.01 |
| Mn | ≤ 0.03 | 0.01 |
| Mg | ≤ 0.03 | 0.01 |
| Zn | ≤ 0.04 | 0.01 |
| Ti | ≤ 0.03 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| Others (each)each other element | ≤ 0.03 | — |
| Alminimum aluminium content defines the grade | ≥ 99.7 (balance) | — |
1070-H22 — frequently asked
What is 1070-H22 used for?
1070-H22 is typically used for electrical conductors and busbars, chemical processing tanks and liners, deep-drawn and spun vessels, foil and thin strip, reflector sheet and bright trim and heat transfer fin stock. In short: very high purity; high conductivity.
What is the yield strength of 1070-H22?
1070-H22 has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 1070-H22 easy to machine?
Not especially — machinability is rated fair (36/100, worse than 84% of aluminum grades). Very soft and gummy — use polished high-rake tools, sharp inserts, high speed with low feed and generous lubricant; consider H18 temper or 6061 substitution for machined parts.
Can 1070-H22 be welded?
Yes — weldability is rated excellent (90/100). Excellent with TIG/MIG using 1100 or 1188 filler (1070 wire for conductor work); resistance and friction-stir welding also fine, but weld metal reverts to annealed strength.
What surface finishes work on 1070-H22?
Anodizes to clear, bright films (standard for reflectors and bright trim); accepts chemical brightening, chromate/chrome-free conversion coating and paint, but the soft surface dents and scratches easily.
Can 1070-H22 be formed, bent or molded?
Outstanding deep drawing, spinning, roll forming and foil rolling in O/H2x tempers; springback is low but the material galls, so use good lubrication and polished dies.
What is the maximum service temperature of 1070-H22?
1070-H22 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 1070-H22?
Yes — 1070-H22 is available for CNC machining and 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: composition and sheet properties — CEN (2019)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Commercially pure aluminium 1070/1070A sheet, strip and foil datasheets — various mills (Chalco, Constellium, Alcoa) (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.