Aluminum 4115-H12
Temper
AA 4115 · EN AW-4115, AlSi2MnMgCu
H12 = strain hardened, quarter hard
Light cold work for slightly stiffer sheet that still bends and draws easily before brazing.
Values for the H12 condition
Other 4115 tempers and conditions
4115 is listed in 6 conditions; see the grade overview at 4115.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Choose for deep-drawn or heavily formed brazing-sheet parts (tubes, header plates) where maximum formability before the braze cycle is needed. | 55 | 130 | 25 | 38 HB | 44 % IACS |
H12This page Strain hardened, quarter hard | Light cold work for slightly stiffer sheet that still bends and draws easily before brazing. | 130 | 160 | 10 | 45 HB | 43 % IACS |
Strain hardened, half hard | The usual as-supplied condition for stamped heat-exchanger plates and fin/tube stock — good stiffness with workable ductility. | 155 | 180 | 8 | 50 HB | 43 % IACS |
Strain hardened and partially annealed, three-quarter hard | Stabilised/partially annealed route to near-H16 strength with better ductility and flatness for formed brazing-sheet components. | 165 | 195 | 7 | 54 HB | 43 % IACS |
Strain hardened, three-quarter hard | Higher-strength coil for roll-formed tube and fin where only gentle bending is required. | 180 | 200 | 5 | 56 HB | 42 % IACS |
Strain hardened, full hard | Maximum pre-braze strength and stiffness; use for thin fin stock or where sagging resistance during the braze cycle matters. | 205 | 225 | 4 | 62 HB | 42 % IACS |
What is 4115-H12?
4115-H12 is 4115 in the H12 temper — light cold work for slightly stiffer sheet that still bends and draws easily before brazing. 4115-H12 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 73% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi). 4115-H12 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 600°C (1,112 °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
- Conducts heat well — 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades
- High electrical conductivity — 43 % IACS, better than 83% of aluminum grades
Limitations
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
- Difficult to machine — 42/100, worse than 77% of aluminum grades
4115-H12 properties
Typical room-temperature values for 4115-H12; 13 are specific to this condition. Other listed values are 4115 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4115-H12 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 600°C (1,112 °F).
Mechanical11
4115-H12 has a yield strength of 130 MPa (18.9 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 73% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
4115-H12 is rated for continuous service to 120°C (248 °F). It conducts heat at 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades. Thermal expansion is 22.3 µm/m·K (12.4 µin/in·°F).
Electrical3
4115-H12 conducts electricity at 43 % IACS, better than 83% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (47/100), worse than 59% of aluminum grades.
Sustainability4
Producing a kilogram of 4115-H12 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 30%.
Manufacturability8
4115-H12's machinability is fair (42/100, worse than 77% of aluminum grades); weldability good (55/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4115-H12
Is 4115 easy to machine?
Machines like a soft Al-Mn sheet but the Si particles are abrasive — use PCD or polished-flute carbide, high speed, low feed and flood coolant to avoid built-up edge in O temper.
Can 4115 be welded?
GTAW/GMAW with 4043 filler is possible on bare core, but the ~600 °C solidus and clad braze layers mean joining is normally done by CAB (NOCOLOK) brazing rather than fusion welding.
Can 4115 be formed, bent or molded?
Excellent cold formability in O/H12; stamped and roll-formed as brazing sheet, with H14–H18 reserved for shallow forming and sag resistance during the braze cycle.
What surface finishes work on 4115?
Anodizes grey/dull because of Si; for service protection rely on the sacrificial clad layer, Zn-arc spray, chromate-free conversion coating or e-coat rather than decorative anodising or polishing.
4115 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 |
|---|---|---|
| Siprincipal alloying addition, Al-Si2 core | 1.5 – 2.5 | 2 |
| Feimpurity limit | ≤ 0.6 | 0.3 |
| Cupost-braze age hardening | 0.1 – 0.6 | 0.3 |
| Mndispersoid strengthening / grain control | 0.5 – 1.2 | 0.9 |
| Mglimited for controlled-atmosphere (NOCOLOK) brazing | 0.05 – 0.5 | 0.2 |
| Zn | ≤ 0.25 | — |
| Tigrain refiner | ≤ 0.15 | — |
| Others (each)others total 0.15 max | ≤ 0.05 | — |
| Alremainder; verify exact limits against current AA Teal Sheet / EN 573-3 registration | balance | — |
4115-H12 — frequently asked
What is 4115-H12 used for?
4115-H12 is typically used for high-strength brazing sheet core, automotive heat exchanger tanks and headers, radiator and condenser tube plate, charge-air cooler side plates and stamped and roll-formed brazing sheet components. In short: strongest brazing-sheet core; sag-resistant during brazing; cu lowers corrosion resistance.
What is the yield strength of 4115-H12?
4115-H12 has a typical yield strength of 130 MPa (18.9 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 73% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 4115-H12 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 77% of aluminum grades). Machines like a soft Al-Mn sheet but the Si particles are abrasive — use PCD or polished-flute carbide, high speed, low feed and flood coolant to avoid built-up edge in O temper.
Can 4115-H12 be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW with 4043 filler is possible on bare core, but the ~600 °C solidus and clad braze layers mean joining is normally done by CAB (NOCOLOK) brazing rather than fusion welding.
What surface finishes work on 4115-H12?
Anodizes grey/dull because of Si; for service protection rely on the sacrificial clad layer, Zn-arc spray, chromate-free conversion coating or e-coat rather than decorative anodising or polishing.
Can 4115-H12 be formed, bent or molded?
Excellent cold formability in O/H12; stamped and roll-formed as brazing sheet, with H14–H18 reserved for shallow forming and sag resistance during the braze cycle.
What is the maximum service temperature of 4115-H12?
4115-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 4115-O and 4115-H18?
O is the default condition — choose for deep-drawn or heavily formed brazing-sheet parts (tubes, header plates) where maximum formability before the braze cycle is needed. H18: maximum pre-braze strength and stiffness; use for thin fin stock or where sagging resistance during the braze cycle matters. Yield strength is 55 MPa in O versus 205 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 sheet, strip and plate — Mechanical properties — CEN (2016)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (aluminium brazing sheet) — ASM International (1993)
- Aluminium brazing sheet core alloy data (heat-exchanger products) — Novelis / Constellium / Granges (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.