Aluminum 7N01
GB 7N01 · JIS A7N01
7N01 is a Japanese weldable Al-Zn-Mg structural alloy (A7N01) without copper, supplied in F, O, T4, T5, T6, T651 and the over-aged T73, T74 and T76 tempers as extrusions and plate.
Reference datasheet — 7N01 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T5 condition
7N01 tempers and conditions
7N01 is supplied in 9 conditions, soft to hard. T5 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for severe forming or deep bending before re-solution treating and ageing. | 120 | 225 | 20 | 65 HB | 40 % IACS |
As fabricated | Mill stock for customers who will heat treat or age the parts themselves; properties are not guaranteed. | 200 | 300 | 15 | 80 HB | 33 % IACS |
Solution heat treated and naturally aged | Choose when parts must be formed or welded first and allowed to re-age naturally to useful strength. | 210 | 330 | 17 | 90 HB | 32 % IACS |
T5Default Cooled from hot working and artificially aged | Default rolling-stock extrusion condition: good strength/weldability balance with press-quench economics. | 285 | 355 | 13 | 105 HB | 35 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Use where SCC and exfoliation resistance outweigh a 10–15 % strength penalty versus T6. | 290 | 345 | 13 | 105 HB | 38 % IACS |
Overaged between T73 and T76 | Compromise temper: most of T6 strength with much of the T73 stress-corrosion benefit. | 300 | 360 | 12 | 110 HB | 37 % IACS |
Overaged for exfoliation-corrosion resistance | Select for thin sections and skins exposed to marine or de-icing environments where exfoliation is the risk. | 310 | 365 | 12 | 112 HB | 36 % IACS |
Solution heat treated and artificially aged | Pick for maximum strength in welded frames and plate parts where full solution treatment is possible. | 320 | 375 | 12 | 115 HB | 34 % IACS |
T6, stress relieved by stretching | Plate temper for machined parts where low residual stress and dimensional stability matter. | 330 | 380 | 11 | 118 HB | 34 % IACS |
What is 7N01?
7N01 is a Japanese weldable Al-Zn-Mg structural alloy (A7N01) without copper, supplied in F, O, T4, T5, T6, T651 and the over-aged T73, T74 and T76 tempers as extrusions and plate. It is used for large welded structures such as railway rolling-stock car bodies because it combines 285 MPa yield, 355 MPa tensile and 13% elongation with a weldability score of 80/100 and HAZ recovery by natural re-ageing. Strength is far below Cu-bearing 7000-series grades, formability is limited in aged tempers (45/100) and welded joints in wet chloride service need post-weld ageing; 7020 and 7005 are equivalents. 7N01 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 600°C (1,112 °F). 7N01 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 355 MPa (51.5 ksi) — stronger than 73% of aluminum grades. Elongation at break is 13% and the elastic modulus is 70 GPa (10.2 Msi).
What is 7N01 used for?
- railway car bodies
- welded structural extrusions
- vehicle frames
Advantages
- Tough — resists crack growth — 33 MPa·√m (30 ksi·√in), better than 87% of aluminum grades
- Ductile — tolerates forming and impact — 13%, better than 79% of aluminum grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7N01 properties
Typical room-temperature values for 7N01-T5; bars are the position among aluminum grades.
Physical3
7N01 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 600°C (1,112 °F).
Mechanical13
7N01 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 355 MPa (51.5 ksi) — stronger than 73% of aluminum grades. Elongation at break is 13% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
7N01 is rated for continuous service to 120°C (248 °F). It conducts heat at 140 W/m·K (80.9 BTU/hr·ft·°F), worse than 52% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7N01 conducts electricity at 35 % IACS, better than 52% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 58% of aluminum grades.
Sustainability4
Producing a kilogram of 7N01 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
7N01's machinability is good (62/100, better than 55% of aluminum grades); weldability very good (80/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 7N01 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 7N01
Is 7N01 easy to machine?
Machines well in aged tempers with sharp carbide tools, high speed and generous coolant; softer T4/O tempers tend to smear and give stringy chips.
Can 7N01 be welded?
Excellent MIG/TIG weldability with ER5356 or Al-Zn-Mg filler; HAZ softens on welding but recovers most strength by natural re-ageing over weeks, so keep welded joints out of long-term wet chloride exposure unless post-weld aged.
Can 7N01 be formed, bent or molded?
Form in O or T4 and age afterwards; aged T5/T6 material has limited bend ductility and needs generous bend radii (≥3–4 t).
7N01 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 |
|---|---|---|
| Si | ≤ 0.3 | 0.15 |
| Fe | ≤ 0.35 | 0.2 |
| Cukept low for weldability and SCC resistance | ≤ 0.2 | 0.05 |
| Mn | 0.2 – 0.7 | 0.35 |
| Mg | 1 – 2 | 1.4 |
| Cr | ≤ 0.3 | 0.1 |
| Zn | 4 – 5 | 4.5 |
| Ti | ≤ 0.2 | 0.03 |
| ZrZr+Ti total limited to 0.25 % | ≤ 0.25 | 0.15 |
| V | ≤ 0.1 | |
| Others (each)total 0.15 % max | ≤ 0.05 | |
| Al | balance |
What surface finishes work on 7N01?
Takes clear and hard anodizing well and paints readily after chromate-free pretreatment; dyed decorative anodizing can look grey-cast compared with 6000-series alloys.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 7N01 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- JIS
- A7N01
How much does 7N01 cost?
7N01 is a premium-cost aluminum ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
7N01 — frequently asked
What is 7N01 used for?
7N01 is typically used for railway car bodies, welded structural extrusions and vehicle frames. In short: weldable high-strength 7000 series; rolling-stock body alloy; HAZ re-ages naturally.
What is the yield strength of 7N01?
7N01 has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 355 MPa (51.5 ksi) — stronger than 73% of aluminum grades. Strength varies by condition: see the 9 listed tempers.
Is 7N01 easy to machine?
Reasonably — machinability is rated good (62/100, better than 55% of aluminum grades). Machines well in aged tempers with sharp carbide tools, high speed and generous coolant; softer T4/O tempers tend to smear and give stringy chips.
Can 7N01 be welded?
Yes — weldability is rated very good (80/100). Excellent MIG/TIG weldability with ER5356 or Al-Zn-Mg filler; HAZ softens on welding but recovers most strength by natural re-ageing over weeks, so keep welded joints out of long-term wet chloride exposure unless post-weld aged.
What surface finishes work on 7N01?
Takes clear and hard anodizing well and paints readily after chromate-free pretreatment; dyed decorative anodizing can look grey-cast compared with 6000-series alloys.
Can 7N01 be formed, bent or molded?
Form in O or T4 and age afterwards; aged T5/T6 material has limited bend ductility and needs generous bend radii (≥3–4 t).
What is the maximum service temperature of 7N01?
7N01 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 7N01-T5 and 7N01-O?
T5 is the default condition — default rolling-stock extrusion condition: good strength/weldability balance with press-quench economics. O: softest condition for severe forming or deep bending before re-solution treating and ageing. Yield strength is 285 MPa in T5 versus 120 MPa in O.
How much does 7N01 cost?
7N01 is a premium-cost aluminum ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- JIS H 4100 — Aluminium and aluminium alloy extruded shapes — Japanese Standards Association (2015)
- JIS H 4000 — Aluminium and aluminium alloy sheets, strips and plates — Japanese Standards Association (2014)
- JIS E 4001 / rolling stock structural material practice — Japanese Standards Association (2011)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (Al-Zn-Mg SCC behaviour) — ASM International (2005)
- International Alloy Designations and Chemical Composition Limits (Teal Sheets) — 7020/7005 comparison — The Aluminum Association (2018)
- SMM / Mysteel aluminium extrusion price references — SMM (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.