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7075:

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Disclaimer: The content of this page is for general information only and is not to be used for engineering or design. The content of this material specification page was compiled from available public sources and authorities on material properties. Although we believe the information to be corrrect, Metal Stock, Inc. is not responsible for the accuracy of any of the material specifications and only presents this data as general information for our customers.

7075 is one of the highest strength aluminum alloys available. Its strength-to-weight ratio is excellent, and itis ideally used for highly stressed parts. It can be formed in the annealed condition and subsequently heat treated. 7075 is comparatively tough for an aluminum alloy. As such, it produces greater springback during forming operations. If forming difficulty is encountered in the annealed condition, then warming the material to 200° - 250°F will assist formability. 7075 alloy is capable of high-strength as developed by heat treating. It also has excellent properties at low temperatures. Its electrical conductivity is 36% of copper.

7075 Drawn Bar conforms to AMS 4122, QQ-A-225/9.
7075 Extruded Bar conforms to AMS 4154, QQ-A-200/11.
7075 Bare Plate conforms to AMS 4045, QQ-A-250/12.
7075-T651 Wrought Aluminum Plate conforms to QQ-A-250/12.

General Information about 7075:


APPLICATIONS:

7075 is used for highly stressed structural parts because of its high strength-to-weight ratio. Applications include aircraft fittings, gears and shafts, fuse parts, meter shafts and gears, missile parts, regulating valve parts, worm gears, keys, and various other commercial aircraft, aerospace and defense equipment and components.

MACHINING AND WELDING:

7075 in the T6 condition has a machinability rating of 80% when compared to 2011 at 100%. 7075 is can be formed in the annealed condition. 7075 may be forged in the temperature range of 700° to 900°F. It should be solution heat treated following forging. 7075 is a very poor choice for welding. Resistance welding is the only preferred method of joining 7075. Gas welding should be avoided and the use of arc welding may result in degradation of corrosion resistance.

HEAT TREATING - Forging, Normalizing, and Annealing:

7075 may be solution annealed at 900°F for two hours at temperature, followed by a water quench. The alloy may then be given a precipation hardening (aging) heat treatment.

ANNEALING:

Annealing is done at 775°F, holding for three hours at temperature. Controlled cooling at 50°F per hour should then be used down to 500°F from which it can be air cooled.

AGING:

Precipitation strengthening (aging) is done at 250°F for 24 hours and air cooled for T6. The T73 temper requires heating to 225°F for eight hours, followed by 24 hours at 325°F and then air cool.

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