Aluminum 4007-H18
Temper
AA 4007 · UNS A94007 · EN AW-4007, AlSi1.5Mn
H18 = strain hardened, full hard
Maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation.
Values for the H18 condition
Other 4007 tempers and conditions
4007 is listed in 11 conditions; see the grade overview at 4007.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Pick for maximum formability: deep drawing, stretch forming and foil/clad-sheet stock before brazing. | 65 | 150 | 27 | 42 HB | 40 % IACS |
As fabricated | Mill condition for hot-rolled plate and re-roll coil where properties are not guaranteed. | 75 | 155 | 22 | 44 HB | 40 % IACS |
Slightly strain hardened | Standard as-supplied condition for EN sheet/plate that has seen only levelling or straightening after annealing; nearly O formability with slightly higher yield. | 85 | 160 | 22 | 46 HB | 40 % IACS |
Strain hardened and partially annealed, quarter hard | Stabilised quarter-hard strip when better ductility than H12 at similar strength is required. | 135 | 180 | 11 | 50 HB | 40 % IACS |
Strain hardened, quarter hard | Choose when moderate bending/roll-forming ability must be combined with roughly double the annealed yield strength. | 150 | 185 | 9 | 52 HB | 39 % IACS |
Strain hardened and partially annealed, half hard | The usual half-hard supply condition for formed sheet parts; more bend-friendly than H14. | 160 | 200 | 8 | 56 HB | 39.5 % IACS |
Strain hardened, half hard | General-purpose semi-hard strip for lightly loaded panels and fins that need only gentle bends. | 175 | 205 | 6 | 58 HB | 39 % IACS |
Strain hardened and partially annealed, three-quarter hard | High-strength stabilised strip with residual bendability for roll-formed profiles. | 185 | 220 | 5 | 62 HB | 39 % IACS |
Strain hardened, three-quarter hard | For flat or roll-formed parts needing high strength and stiffness with minimal forming. | 200 | 225 | 4 | 64 HB | — |
Strain hardened and partially annealed, full hard | Full-hard stabilised thin strip/foil for flat, high-strength applications. | 220 | 245 | 3 | 68 HB | 39 % IACS |
H18This page Strain hardened, full hard | Maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation. | 230 | 250 | 3 | 70 HB | 158 W/m·K |
What is 4007-H18?
4007-H18 is 4007 in the H18 temper — maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation. 4007-H18 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 60% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi). 4007-H18 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 625°C (1,157 °F). O is the default condition FabDigit quotes; H18 is available on request or by drawing note.
Limitations
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
- Limited ductility — 3%, worse than 79% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
4007-H18 properties
Typical room-temperature values for 4007-H18; 12 are specific to this condition. Other listed values are 4007 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
4007-H18 has a density of 2.73 g/cm³ (0.0986 lb/in³), heavier than 61% of aluminum grades. It melts at 625°C (1,157 °F).
Mechanical12
4007-H18 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 60% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
4007-H18 is rated for continuous service to 100°C (212 °F). It conducts heat at 158 W/m·K (91.3 BTU/hr·ft·°F), better than 74% of aluminum grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
4007-H18 conducts electricity at 40 % IACS, better than 72% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 57% of aluminum grades.
Sustainability4
Producing a kilogram of 4007-H18 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
4007-H18's machinability is good (58/100, worse than 54% of aluminum grades); weldability good (62/100); formability poor (32/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4007-H18
Is 4007 easy to machine?
Machines like a soft Al-Mn sheet alloy: use polished high-rake carbide, high speed and flood lubrication to avoid built-up edge; hard tempers chip-break better than O.
Can 4007 be welded?
GTAW/GMAW with 4043 or 4047 filler and resistance/laser welding work well; avoid autogenous fusion of thin cold-worked strip because of hot-cracking and full local softening of the HAZ.
Can 4007 be formed, bent or molded?
Excellent cold formability in O/H111 (deep drawing, fin corrugating, bending to tight radii); H16–H18 tolerate only large-radius bends and should be bent across the rolling direction.
What surface finishes work on 4007?
Prefer chemical conversion coating, chromate-free pretreat plus paint, or brazing-flux compatible surfaces; decorative anodizing gives dark grey mottling because of Si/Mn/Ni intermetallics.
4007 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/eutectic former | 1 – 1.7 | 1.4 |
| Fe | 0.4 – 1 | 0.7 |
| Cu | ≤ 0.2 | 0.05 |
| Mndispersoid former, raises strength | 0.8 – 1.5 | 1.2 |
| Mg | ≤ 0.2 | 0.05 |
| Cr | 0.05 – 0.25 | 0.15 |
| Nithermal stability | 0.15 – 0.7 | 0.35 |
| Zn | ≤ 0.1 | — |
| Ti | ≤ 0.1 | — |
| Others (each)0.15 % total | ≤ 0.05 | — |
| Al | balance | — |
4007-H18 — frequently asked
What is 4007-H18 used for?
4007-H18 is typically used for foil stock, fin stock and thin gauge sheet. In short: stronger than 1000-series foil; high-formability fin alloy; not heat treatable.
What is the yield strength of 4007-H18?
4007-H18 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 60% of aluminum grades. Strength varies by condition: see the 11 listed tempers.
Is 4007-H18 easy to machine?
Reasonably — machinability is rated good (58/100, worse than 54% of aluminum grades). Machines like a soft Al-Mn sheet alloy: use polished high-rake carbide, high speed and flood lubrication to avoid built-up edge; hard tempers chip-break better than O.
Can 4007-H18 be welded?
Yes — weldability is rated good (62/100). GTAW/GMAW with 4043 or 4047 filler and resistance/laser welding work well; avoid autogenous fusion of thin cold-worked strip because of hot-cracking and full local softening of the HAZ.
What surface finishes work on 4007-H18?
Prefer chemical conversion coating, chromate-free pretreat plus paint, or brazing-flux compatible surfaces; decorative anodizing gives dark grey mottling because of Si/Mn/Ni intermetallics.
Can 4007-H18 be formed, bent or molded?
Excellent cold formability in O/H111 (deep drawing, fin corrugating, bending to tight radii); H16–H18 tolerate only large-radius bends and should be bent across the rolling direction.
What is the maximum service temperature of 4007-H18?
4007-H18 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 4007-O and 4007-H18?
O is the default condition — pick for maximum formability: deep drawing, stretch forming and foil/clad-sheet stock before brazing. H18: maximum cold-worked strength; used for thin strip and foil where forming is limited to slitting and light corrugation. Yield strength is 65 MPa in O versus 230 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 and form 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)
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.