7055 aluminium forgings forged product parts are generally used in the T77 state to manufacture aircraft load-bearing structural parts recently produced, such as 7055 T77511 for the upper wing panel of ARJ21-700 regional airliner being manufactured in China, 7055-T77 for landing gear joints and 7055 T76511 for the long truss of the fuselage. 7055 super-strength aluminium alloy is the highest strength alloy in wrought aluminium alloy at present. The microstructure of 7055 alloy is resistant to intergranular cracking and corrosion, and its microstructure has strong ability to hinder dislocation movement.


 
7055 T77 aluminium forgings forged product parts are generally used in large aircraft upper wing skin, truss, horizontal tail, keel beam, seat rail, freight slide. Compressive strength and tensile strength are 10% higher than 7150, and fracture toughness and corrosiveness are similar to 7150.

7050 Alloy Chemical Composition

Alloy

Si

Fe

Cu

Mn

Mg

Cr

Ni

Zn

Ti

Zr

Others

Al

Unit

Total

7055

0.10

0.15

2.0~2.6

0.05

1.8~2.3

0.04

~

7.6~8.4

0.06

0.05~0.25

0.05

0.15

Rest

 
 
 
 

Alloy	Alloy sereis	Main features	Σb Value /MPa	Working temperature/℃
7055	7050 series	7055 is currently the highest alloying degree of 7 x x x series aluminium alloy. Compared with 7150 alloy, it improves tensile and compressive strength while maintaining some important properties such as fracture toughness and corrosion resistance.	643～669	<125

Type	Alloy	Projected area（m2）Or weight（kg）	Temper	Standard
Aluminum free forging	5 series	≤3000kg	O、F	GBn223     ASTMB247
	2、6、7 series	≤3000kg	T6、T4、O、F、T77
Aluminum die forging	5 series	≤2.5m2	O、F
	2、6、7 series	≤2.5m2	T6、T4、O、F、T77