Aluminum 4015-H12
Temper
AA 4015 · UNS A94015 · EN AW-4015, AlSi2Mn
H12 = strain hardened, quarter hard
Light cold work for slightly stiffer sheet that still bends and forms readily.
Values for the H12 condition
Other 4015 tempers and conditions
4015 is listed in 10 conditions; see the grade overview at 4015.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Default supply condition for brazing-sheet core and deep-drawn parts; maximum formability, lowest strength. | 55 | 120 | 26 | 31 HB | 43 % IACS |
Slightly strain hardened | Choose when flat, essentially soft sheet with mill leveling is needed; properties only marginally above O. | 60 | 125 | 23 | 33 HB | 43 % IACS |
As fabricated | Mill product taken directly from hot working; used as feedstock for further rolling, cladding or brazing-sheet manufacture. | 70 | 135 | 20 | 35 HB | 43 % IACS |
Strain hardened and partially annealed, quarter hard | Stabilized quarter-hard sheet giving H12-level strength with better ductility for forming. | 110 | 145 | 12 | 39 HB | 42.5 % IACS |
H12This page Strain hardened, quarter hard | Light cold work for slightly stiffer sheet that still bends and forms readily. | 120 | 148 | 9 | 40 HB | 42.5 % IACS |
Strain hardened and partially annealed, half hard | Half-hard sheet with recovered ductility; preferred over H14 when tighter bend radii are needed. | 125 | 160 | 9 | 44 HB | 42 % IACS |
Strain hardened, half hard | Most common work-hardened stock for brazed tube/plate stock needing handling stiffness before the braze cycle. | 138 | 163 | 6 | 45 HB | 42 % IACS |
Strain hardened and partially annealed, three-quarter hard | Stabilized three-quarter hard coil for roll-formed tube where springback must stay consistent. | 148 | 178 | 6 | 49 HB | 41.5 % IACS |
Strain hardened, three-quarter hard | Higher strength thin gauge where only mild bending is required. | 158 | 180 | 4 | 50 HB | 42 % IACS |
Strain hardened, full hard | Maximum as-rolled strength and flatness for fin/tube stock that is formed only by roll-forming, then softened by brazing. | 180 | 200 | 3 | 56 HB | 41.5 % IACS |
What is 4015-H12?
4015-H12 is 4015 in the H12 temper — light cold work for slightly stiffer sheet that still bends and forms readily. 4015-H12 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 148 MPa (21.5 ksi) — weaker than 77% of aluminum grades. Elongation at break is 9% and the elastic modulus is 70 GPa (10.2 Msi). 4015-H12 has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 630°C (1,166 °F). O is the default condition FabDigit quotes; H12 is available on request or by drawing note.
Advantages
- Forms and bends easily — 75/100, better than 86% of aluminum grades
- High electrical conductivity — 42.5 % IACS, better than 82% of aluminum grades
- Readily welded — 85/100, better than 79% of aluminum grades
- Conducts heat well — 162 W/m·K (93.6 BTU/hr·ft·°F), better than 77% of aluminum grades
Limitations
- Difficult to machine — 38/100, worse than 84% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
- Low strength — 120 MPa (17.4 ksi), worse than 77% of aluminum grades
4015-H12 properties
Typical room-temperature values for 4015-H12; 13 are specific to this condition. Other listed values are 4015 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4015-H12 has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 630°C (1,166 °F).
Mechanical11
4015-H12 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 148 MPa (21.5 ksi) — weaker than 77% of aluminum grades. Elongation at break is 9% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
4015-H12 is rated for continuous service to 120°C (248 °F). It conducts heat at 162 W/m·K (93.6 BTU/hr·ft·°F), better than 77% of aluminum grades. Thermal expansion is 23.2 µm/m·K (12.9 µin/in·°F).
Electrical3
4015-H12 conducts electricity at 42.5 % IACS, better than 82% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 70% of aluminum grades.
Sustainability4
Producing a kilogram of 4015-H12 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
4015-H12's machinability is fair (38/100, worse than 84% of aluminum grades); weldability excellent (85/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4015-H12
Is 4015 easy to machine?
Gummy in O/H1x tempers — use sharp polished-flute carbide, high rake, high speed and flood coolant; the ~2% Si adds mild tool abrasion, chip breaking is poor.
Can 4015 be welded?
Excellent for GTAW/GMAW/resistance welding with 4043 or 4047 filler; no hot-cracking issues, but weld and braze zones return to near-O strength.
Can 4015 be formed, bent or molded?
O and H1x2 tempers deep-draw and roll-form well; work-hardens quickly so interstage anneal at 340–400 °C for severe draws, and Mn dispersoids prevent coarse post-braze grain.
What surface finishes work on 4015?
Chromate-free (Ti/Zr) conversion coating or painting is standard on heat-exchanger parts; anodizing is protective but grey/dark due to Si, so avoid for decorative bright finishes.
4015 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/brazing-compatible addition | 1.4 – 2.2 | 1.8 |
| Feimpurity limit | ≤ 0.7 | 0.35 |
| Cukept low for corrosion resistance | ≤ 0.2 | 0.05 |
| Mndispersoid former; controls post-braze grain size | 0.6 – 1.2 | 0.9 |
| Mglimited for CAB (NOCOLOK) brazing compatibility | ≤ 0.5 | 0.15 |
| Zn | ≤ 0.2 | 0.05 |
| Tigrain refiner residue | ≤ 0.1 | 0.02 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
4015-H12 — frequently asked
What is 4015-H12 used for?
4015-H12 is typically used for brazing sheet core stock, heat exchanger tubing and fin stock. In short: weldable brazing-sheet core; best formability in family; fine post-braze grain structure.
What is the yield strength of 4015-H12?
4015-H12 has a typical yield strength of 120 MPa (17.4 ksi) and a tensile strength of 148 MPa (21.5 ksi) — weaker than 77% of aluminum grades. Strength varies by condition: see the 10 listed tempers.
Is 4015-H12 easy to machine?
Not especially — machinability is rated fair (38/100, worse than 84% of aluminum grades). Gummy in O/H1x tempers — use sharp polished-flute carbide, high rake, high speed and flood coolant; the ~2% Si adds mild tool abrasion, chip breaking is poor.
Can 4015-H12 be welded?
Yes — weldability is rated excellent (85/100). Excellent for GTAW/GMAW/resistance welding with 4043 or 4047 filler; no hot-cracking issues, but weld and braze zones return to near-O strength.
What surface finishes work on 4015-H12?
Chromate-free (Ti/Zr) conversion coating or painting is standard on heat-exchanger parts; anodizing is protective but grey/dark due to Si, so avoid for decorative bright finishes.
Can 4015-H12 be formed, bent or molded?
O and H1x2 tempers deep-draw and roll-form well; work-hardens quickly so interstage anneal at 340–400 °C for severe draws, and Mn dispersoids prevent coarse post-braze grain.
What is the maximum service temperature of 4015-H12?
4015-H12 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 4015-O and 4015-H18?
O is the default condition — default supply condition for brazing-sheet core and deep-drawn parts; maximum formability, lowest strength. H18: maximum as-rolled strength and flatness for fin/tube stock that is formed only by roll-forming, then softened by brazing. Yield strength is 55 MPa in O versus 180 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 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)
- Aluminium brazing sheet core alloy data (CAB heat-exchanger materials) — Constellium / Gränges (typical producer literature) (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.