Name: Aluminium 7075 4.0 Mm Sheets & Plates
Brand: Vintex Steel & Engg. Co.
Availability: InStock
Rating: 1 (1 reviews)

Question 1

Which temper should I choose for 4.0 mm material: 7075 T6 for maximum strength or 7075 T7351 for corrosion resistance?

Accepted Answer

The choice depends entirely on the operating environment. 7075 T6 offers the highest possible strength (typical yield strength around 500 MPa), making it ideal for high load, non corrosive structural applications like internal aircraft components or high performance race car chassis parts. However, the T6 temper is highly susceptible to Stress Corrosion Cracking (SCC). If the 4.0 mm material will be exposed to moisture, salt, or high stress in a humid environment (like marine or external aerospace use), you must choose the 7075 T7351 temper. T7351 accepts a slight reduction in strength (yield strength around 434 MPa) in exchange for significantly superior SCC resistance, making it the safer, more durable choice for critical outdoor or aggressive applications.

Question 2

Can 4.0 mm 7075 sheets be easily bent or welded for fabrication, and what are the best practices?

Accepted Answer

Since 7075 is a high strength aluminum alloy, fabrication is challenging and requires specific techniques. Its high strength and low ductility mean it has poor formability (difficult to bend) compared to softer alloys like 5052 or 6061, especially at the 4.0 mm thickness. Bending should be limited to large radii and preferably done on the softer O temper before final heat treatment, though this is rarely practical. More critically, 7075 is considered non weldable by conventional fusion welding (like TIG/MIG) due to severe hot cracking. Therefore, 4.0 mm parts must primarily be joined using mechanical fastening (riveting or bolting) or specialized methods like Friction Stir Welding (FSW).

Question 3

What are the typical commercial specifications for 4.0 mm 7075 sheets, including thickness tolerance and common plate si

Accepted Answer

For a 4.0 mm plate, you will typically order material to the ASTM B209 or AMS 4045/4049 aerospace specifications. The 4.0 mm thickness falls squarely within the 'sheet' or lighter 'plate' category. Common plate sizes in the market are usually large to accommodate cutting, such as 1220 mm×2440 mm (4 ft×8 ft) or 1520 mm×3050 mm (5 ft×10 ft). Due to the high strength and critical use, the dimensional tolerance on thickness is strict; standard commercial tolerance for 4.0 mm plate under ASTM B209 is typically around ±0.1 mm, but always verify the exact tolerance with your supplier's Mill Test Certificate (MTC).

Thickness	12
Width	48
Hardness	150 Hb
Surface Finish	Mill Finish, Anodized

Aluminium 7075 4.0 Mm Sheets & Plates

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