7075 Aluminum Bar

7075 is one of the highest strength aluminum alloys available. Its strength-to-weight ratio is excellent, and is 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.

ANALYSIS

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

MECHANICAL PROPERTIES

The above values are average and may be considered as representative of 7075 Aluminum Bar in tempers shown

APPLICATIONS

Due to its high strength-to-weight ratio, 7075 is used for highly stressed structural parts. 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

MACHINEABILITY AND WELDABILITY

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

7075 may be solution annealed at 900°F for 2 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 3 hours at temperature. Controlled cooling at 50F per hour should then be used down to 500F 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 8 hours, followed by 24 hours at 325°F and then air cool.

TOLERANCES

SPEEDY METALS ITEMS