Aluminum 1275-H22
Temper
AA 1275 · EN AW-1275, Al99.75
H22 = strain hardened and partially annealed, quarter hard
Same strength class as H12 but with better ductility and more stable properties for forming.
Values for the H22 condition
Other 1275 tempers and conditions
1275 is listed in 13 conditions; see the grade overview at 1275.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for deep drawing, spinning, chemical-vessel lining and foil where maximum ductility matters. | 25 | 70 | 42 | 19 HB | 62 % IACS |
Slightly strain hardened | Sheet/plate essentially in O condition but with incidental work from levelling or stretching. | 30 | 75 | 35 | 21 HB | 61.8 % IACS |
Strain hardened from hot working only | Hot-rolled plate, extrusions and forged shapes where only modest guaranteed strength is required. | 32 | 78 | 28 | 22 HB | 61.5 % IACS |
As fabricated | Extruded or cast-and-rolled stock supplied without guaranteed mechanicals; used where properties are set by later processing. | 35 | 80 | 25 | 23 HB | 61.5 % IACS |
H22This page Strain hardened and partially annealed, quarter hard | Same strength class as H12 but with better ductility and more stable properties for forming. | 68 | 88 | 16 | 25 HB | 61.8 % IACS |
Strain hardened, quarter hard | Light cold work for slightly higher strength while retaining good bending and forming. | 72 | 85 | 14 | 25 HB | 61.8 % IACS |
Strain hardened and partially annealed, half hard | Preferred over H14 when the part must still be bent or drawn after supply. | 85 | 103 | 11 | 30 HB | 61.5 % IACS |
H14Default Strain hardened, half hard | The general-purpose stocked sheet temper: usable strength and flatness with acceptable bending. | 90 | 100 | 8 | 30 HB | 61.5 % IACS |
Strain hardened and partially annealed, three-quarter hard | H16-level strength with improved bend behaviour, for roll-formed profiles and trim. | 100 | 118 | 7 | 34 HB | 61.3 % IACS |
Strain hardened, three-quarter hard | Choose for flat panels and shallow forming where higher stiffness under handling is wanted. | 105 | 115 | 5 | 34 HB | 61.3 % IACS |
Strain hardened and partially annealed, full hard | Full-hard strip stabilized by a partial anneal; used for foil and thin strip needing consistent hardness. | 118 | 132 | 5 | 38 HB | 61 % IACS |
Strain hardened, full hard | Maximum practical strength from cold work; for flat strip, foil stock and rigid trim with minimal forming. | 120 | 130 | 4 | 38 HB | 61 % IACS |
Strain hardened, extra hard | Extra-hard strip/wire condition beyond H18, used for springy strip, foil and conductor wire. | 140 | 150 | 3 | 42 HB | 60.8 % IACS |
What is 1275-H22?
1275-H22 is 1275 in the H22 temper — same strength class as H12 but with better ductility and more stable properties for forming. 1275-H22 has a yield strength of 68 MPa (9.86 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 92% of aluminum grades. Elongation at break is 16% and the elastic modulus is 69 GPa (10 Msi). 1275-H22 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 646°C (1,195 °F). H14 is the default condition FabDigit quotes; H22 is available on request or by drawing note.
Advantages
- High electrical conductivity — 61.8 % IACS, better than 98% of aluminum grades
- Conducts heat well — 231 W/m·K (133.5 BTU/hr·ft·°F), better than 97% of aluminum grades
- Polishes to a fine finish — 85/100, better than 96% of aluminum grades
- Readily welded — 92/100, better than 95% of aluminum grades
- Forms and bends easily — 90/100, better than 93% of aluminum grades
Limitations
- Low strength — 68 MPa (9.86 ksi), worse than 92% of aluminum grades
- Difficult to machine — 30/100, worse than 92% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
1275-H22 properties
Typical room-temperature values for 1275-H22; 17 are specific to this condition. Other listed values are 1275 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
1275-H22 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 646°C (1,195 °F).
Mechanical11
1275-H22 has a yield strength of 68 MPa (9.86 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 92% of aluminum grades. Elongation at break is 16% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
1275-H22 is rated for continuous service to 120°C (248 °F). It conducts heat at 231 W/m·K (133.5 BTU/hr·ft·°F), better than 97% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
1275-H22 conducts electricity at 61.8 % IACS, better than 98% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), better than 67% of aluminum grades.
Sustainability4
Producing a kilogram of 1275-H22 takes about 210 MJ of energy and emits 13 kg of CO₂ — more than 88% of aluminum grades. Typical recycled content is 3%.
Manufacturability7
1275-H22's machinability is poor (30/100, worse than 92% of aluminum grades); weldability excellent (92/100); formability excellent (90/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1275-H22
Is 1275 easy to machine?
Very soft and gummy — use polished high-rake carbide, high speed, generous feed and flood coolant or lubricated air to avoid built-up edge and smeared surfaces.
Can 1275 be welded?
Excellent GTAW/GMAW and resistance weldability; use 1100 or 1188 filler for matching purity and expect the weld/HAZ to return to O-temper strength.
Can 1275 be formed, bent or molded?
Outstanding cold formability in O/H22 — deep drawing, spinning and roll forming are easy; interanneal at 340–410 °C when heavy work-hardening builds up.
What surface finishes work on 1275?
Ideal for bright dipping and clear or coloured anodizing with very low haze; chemical conversion coating, painting and electropolishing all work well, but pure Al is soft so surfaces mark easily.
1275 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 |
|---|---|---|
| Siimpurity limit | ≤ 0.08 | 0.04 |
| Feimpurity limit | ≤ 0.12 | 0.07 |
| Cu | ≤ 0.05 | 0.01 |
| Mn | ≤ 0.02 | 0.01 |
| Mg | ≤ 0.02 | 0.01 |
| Zn | ≤ 0.05 | 0.01 |
| Ti | ≤ 0.03 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| Ga | ≤ 0.03 | 0.01 |
| Others (each)each other element | ≤ 0.02 | — |
| Al99.75 % min by difference | ≥ 99.75 (balance) | — |
1275-H22 — frequently asked
What is 1275-H22 used for?
1275-H22 is typically used for chemical process vessels, decorative trim, electrical conductor stock and reflector sheet. In short: european 99.75% purity grade; high conductivity, 61.5% IACS; low ductility as supplied.
What is the yield strength of 1275-H22?
1275-H22 has a typical yield strength of 68 MPa (9.86 ksi) and a tensile strength of 88 MPa (12.8 ksi) — weaker than 92% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 1275-H22 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 92% of aluminum grades). Very soft and gummy — use polished high-rake carbide, high speed, generous feed and flood coolant or lubricated air to avoid built-up edge and smeared surfaces.
Can 1275-H22 be welded?
Yes — weldability is rated excellent (92/100). Excellent GTAW/GMAW and resistance weldability; use 1100 or 1188 filler for matching purity and expect the weld/HAZ to return to O-temper strength.
What surface finishes work on 1275-H22?
Ideal for bright dipping and clear or coloured anodizing with very low haze; chemical conversion coating, painting and electropolishing all work well, but pure Al is soft so surfaces mark easily.
Can 1275-H22 be formed, bent or molded?
Outstanding cold formability in O/H22 — deep drawing, spinning and roll forming are easy; interanneal at 340–410 °C when heavy work-hardening builds up.
What is the maximum service temperature of 1275-H22?
1275-H22 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.
What is the difference between 1275-H14 and 1275-O?
H14 is the default condition — the general-purpose stocked sheet temper: usable strength and flatness with acceptable bending. O: pick for deep drawing, spinning, chemical-vessel lining and foil where maximum ductility matters. Yield strength is 90 MPa in H14 versus 25 MPa in O.
Sources
- EN 573-3 Aluminium and aluminium alloys — Chemical composition of wrought products — CEN (2019)
- EN 485-2 Aluminium and aluminium alloys — Sheet, strip and plate: Mechanical properties — CEN (2016)
- 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)
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.