Wrought Aluminium

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Grade 7xxx Alloys

Composition

The principle alloying element in Grade 7xxx alloys is Zinc, which accounts for up to 12.0% of these alloys by weight. Additional alloying elements include; 3.7 Magnesium, 2.8 Copper, ≤1.4 Iron, ≤0.8 Manganese, ≤0.5 Silicon, ≤0.5 Zirconium, ≤0.35

Chromium, ≤0.2 Titanium, ≤0.16 Nickel, ≤0.1 Vanadium, ≤0.03 Gallium, ≤0.01 Bismuth & ≤0.01 Lead

Characteristics

  • Highest strength Aluminium alloy

  • May be Alclad for increased corrosion resistance 

Commonly Used Alloys (AA)

7003 | 7004 | 7204 | 7005 | 7108(A) | 7009

7010 | 7012 | 7014 | 7015 | 7016 | 7116 | 7017 

7018 | 7019(A) | 7020 | 7021 | 7022 | 7023 

7024 | 7025 | 7026 | 7028 | 7029 | 7129 | 7229  7030 | 7031 | 7032 | 7034 | 7035(A) | 7036  7136 | 7037 | 7039 | 7040 | 7140 | 7041 | 7042  7046(A) | 7047 | 7049(A) | 7149 | 7249 | 7349  7449 | 7050(A) 7150 | 7055 | 7155 | 7255  7056 | 7060 | 7064 7065 | 7068 | 7168 | 7072  7075 | 7175 | 7475 7076 | 7178 | 7278(A)  7081 | 7181 | 7085 | 7185 | 7090 | 7093 | 7095  7099 | 7199

Common Forms

7xxx Series Alloys are commonly available in

  • Sheets and Plates

  • Drawn and extruded Tubes

  • Extruded Wire, Rod, Bar and Profiles

  • Rolled and cold finished Wires, Rods and Bars

  • Rivets

  • Forgings

(Not all alloys or tempers available in all shapes)

Uses

  • Aeronautical components

  • Leisure and recreation products

Weldability

Aside from spot welding, Grade 7xxx Alloys are very difficult to weld, the exception being 7072.

Commonly Used Alloys (UNS)

A97003 | A97004 | A97204 | A97005

A97108(A) | A97009 A97010 | A97012

A97014 | A97015 | A97016 | A97116 | A9701

A97018 | A97019(A) | A97020 | A97021

A97022 | A97023  A97024 | A97025 | A9702

A97028 | A97029 | A97129 | A97229 | A97030

A97031 | A97032 | A97034 | A97035(A)

A97036 A97136 | A97037 | A97039 | A97040

A97140 | A97041 | A97042 A97046(A)

A97047 | A97049(A) | A97149 | A97249

A97349 A97449 | A97050(A)

A97150 | A97055 | A97155 | A97255 | A97056

A97060 | A97064 | A97065 | A97068 | A97168

A97072  A97075 | A97175 | A97475

A97076 | A97178 | A97278(A)  A97081 | A97181 | A97085 | A97185 | A97090 A97093 | A97095  A97099 | A97199

Machinability

Grade 7xxx Alloys are fairly decent to machine, although this is not their forte. 

 

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