7075 T7351 Aluminum Plate
7075 T7351 is a high-strength aluminum alloy material, belonging to the 7xxx series aluminum alloys, with zinc (Zn) as the main alloying element. It is one of the highest strength alloys in this series.
T7351 is an over-aged temper condition that provides excellent resistance to stress corrosion cracking while maintaining a relatively high strength level.
The 7075 T7351 material has very high strength and hardness, with strength levels equal to or exceeding those of low carbon steel, making it an ideal choice for structural components that need to withstand high stress.
The 7075 T7351 aluminum alloy material complies with multiple internationally recognized industry standards, mainly including:
- ASTM B209: The American Society for Testing and Materials (ASTM) standard specification for aluminum and aluminum-alloy sheet, strip, and plate
- AMS QQ-A-250/12: Aerospace Material Specification (AMS) quality requirements for aluminum alloy sheet and strip
- AMS 4078: Aerospace Material Specification detailing the T7351 heat treatment condition requirements for aluminum alloy sheet and strip
Additionally, this material may also meet other standards such as AMS 2154, ASTM B594, BSS 7055, MMS 159, etc.
Specifications and Parameters of 7075 T7351 Material
Common Thickness and Specifications of 7075 T7351 Aluminum Plate
The thickness range of 7075 T7351 aluminum alloy plates is wide, with common specifications including:
- Thin plate: 0.032 inches (0.81mm), 0.0625 inches (1.59mm), 0.125 inches (3.18mm)
- Medium plate: 0.25 inches (6.35mm), 0.375 inches (9.53mm), 0.5 inches (12.7mm), 0.75 inches (19.05mm)
- Thick plate: 1 inch (25.4mm), 1.5 inches (38.1mm), 1.75 inches (44.45mm), 2.5 inches (63.5mm), etc.
Common Sizes of 7075 T7351
Dimensions of 7075 T7351 aluminum plates
- Width: usually 48 inches (1219mm) or customized
- Length: usually 144 inches (3658mm) or customized
- 12" X 12"
- 12" X 24"
- 12" X 36"
- 12" X 48"
- 24" X 24"
- 24" X 36"
- 24" X 48"
- 36" X 36"
- 36" X 48"
- 48" X 48"
- 48" X 144"
Common Product Forms of 7075 T7351 Aluminum
- 7075 T7351 aluminum plates and sheets: flat shape with uniform thickness, widely used for structural parts and panels
- 7075 T7351 aluminum bars: round or rectangular cross-section, used to machine various mechanical parts and structural components
- 7075 T7351 aluminum tubes: hollow circular cross-section, used for lightweight and high-strength tubular structures
- 7075 T7351 aluminum wires: small diameter round cross-section, used for manufacturing cold heading parts, bolts, and fasteners
- 7075 T7351 aluminum forgings: various shapes produced by forging process, used for critical components under high stress
- 7075 T7351 aluminum extrusions: products with specific cross-sectional shapes such as angles, channels, etc.
Common Temper States of 7075 by Haomei Aluminum
Common temper conditions for 7075 aluminum alloy include:
- T6: solution heat treated and artificially aged, offering high strength and hardness but poorer corrosion resistance
- T651: solution heat treated, stress-relieved by stretching, then artificially aged, suitable for applications requiring high precision and flatness
- T73: solution heat treated and over-aged to improve resistance to stress corrosion cracking
- T7351: solution heat treated, stress-relieved by stretching, then over-aged, combining high strength and good stress corrosion resistance
- T73511: suitable for extruded products like bars and profiles, with specific stress relief treatment
- O: annealed condition, with highest ductility and lowest strength
Applications of 7075 T7351
Aerospace Applications
7075 T7351 aluminum alloy has wide applications in aerospace due to its high strength, light weight, good corrosion resistance, and excellent strength-to-weight ratio. Specific applications include:
- Aircraft structural parts: such as fuselage structures and frames, which are primary application areas for 7075 T7351 aluminum plates
- Wing and tail structures: providing necessary strength and lightweight characteristics
- Aircraft skin: used as external covering material requiring high strength and good surface treatment properties
- Aircraft landing gear components: bearing the enormous stresses during takeoff and landing
- Aerospace engine parts: maintaining good mechanical performance even under high-temperature environments
Other Industrial Applications
Besides aerospace, 7075 T7351 aluminum alloy is also widely used in other high-performance demanding fields:
- Mold manufacturing: for injection molds and die-casting molds, especially in the plastics industry
- High-performance automotive parts: such as structural components and suspension system parts in racing and high-performance cars
- Military equipment: such as weapon system parts and armored vehicle structural components
- Sports equipment: such as bicycle frames, golf club heads, tennis rackets, etc.
- Marine engineering: used in marine environments requiring high strength and some seawater corrosion resistance
- Precision mechanical parts: such as instrument shafts, gears, and worm gears requiring high precision and strength
Differences Between 7075 T651 and 7075 T7351
Heat Treatment Process Differences
The main difference between 7075 T651 and 7075 T7351 lies in their heat treatment processes and subsequent treatments:
- 7075 T651: solution heat treatment → rapid quenching → artificial aging → stretching stress relief
- 7075 T7351: solution heat treatment → rapid quenching → stretching stress relief → over-aging treatment
The over-aging process in T7351 is the key difference from T651, significantly improving the material’s resistance to stress corrosion cracking.
Corrosion Resistance Comparison
- 7075 T651 has moderate corrosion resistance but poor resistance to stress corrosion cracking (SCC), especially in high temperature and high humidity environments.
- 7075 T7351 significantly improves resistance to stress corrosion cracking through over-aging treatment and is one of the best corrosion resistant tempers among 7075 alloys.
Processing Performance Differences
- Machinability: both have good machinability, but T7351 may be easier to machine in some cases due to its lower hardness
- Weldability: welding performance of both is generally average, typically requiring special welding procedures and filler materials
- Surface treatment: both accept various surface treatments well, such as anodizing and painting
- Cold working: T651, due to its higher strength, may require greater force during cold working, whereas T7351 is relatively easier to cold work
Application Scenarios Comparison
7075 T651 Application Scenarios
- Structural parts requiring the highest strength
- Applications not exposed to severe corrosive environments
- Situations with extremely strict weight requirements
- Examples include aircraft main beams, high-strength bolts, etc.
7075 T7351 Application Scenarios
- Applications requiring high strength with good corrosion resistance
- Structural parts potentially exposed to humid or corrosive environments
- Components subject to long-term high stress
- Examples include aircraft landing gear components, structural parts in marine environments, etc.
Advantages and Limitations of 7075 T7351
Advantages of 7075 T7351 Aluminum
- High strength-to-weight ratio, one of the strongest commercially available aluminum alloys
- Good resistance to stress corrosion cracking
- Excellent machinability and surface treatment characteristics
- Good fatigue strength and impact resistance
- Can be further strengthened by heat treatment and cold working
- Complies with multiple international standards, ensuring quality and reliability
Limitations of 7075 T7351 Aluminum
- Higher cost compared to other aluminum alloys
- Average weldability, requiring special welding procedures
- Corrosion resistance, although better than T651, is still inferior to some other aluminum alloy series
- Processing difficulty is relatively high, especially in heat-treated condition
