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7 Series Alu Forgings

7A04 alloy is a heat-treated strengthening alloy of Al-Zn-Mg-Cu system. Its strength is higher than that of hard aluminium. Its yield strength is close to tensile strength and its plasticity is lower. Its sensitivity to stress concentration is strong, especially under the condition of vibration load and repeated static load. Therefore, the design, manufacturing and assembly of parts need to strictly avoid stress concentration and additional stress factors. The heat resistance of the alloy is poor, and it will soften sharply when the temperature is higher than 125 C. The stress corrosion resistance of thick parts in short and transverse direction is poor.
 
7A04 aluminum forgings forged product parts is widely used in the main stress parts of aircraft structure, such as girder, truss, partition frame, skin, wing rib, joint, landing gear parts, etc. It can produce various semi-finished products, such as sheets, strips, profiles, bars, wallboards, pipes, wires, free forgings and die forgings.
Chemical Composition of 7A04 aluminum alloy
Alloy Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Others Al
Single Total
7A04 0.50 0.50 1.4~2.0 0.20~0.60 1.8~2.8 0.15~0.25 5.0~7.0 0.05 0.15 Rest
 
 
Alloy Alloy series Main features Σb Value/MPa Working temperature/℃
7A04 B95(Russia) Yield strength is close to tensile strength, plasticity is low, and sensitivity to stress concentration is strong, especially under the condition of vibration load and repeated static load. Therefore, stress concentration and additional stress factors should be strictly avoided in the design, manufacture and assembly process of parts. The short transverse Kang stress corrosion resistance of the heavy alloy parts is poor.  
                  480~570
<125
Physical Property of 7A04 aluminum forgings forged product parts
Alloy Type Temper δ Specs/mm Direction σb/MPa σp 0.2/MPa δ % Standard
7A04 Free forgings T6 Weight ≤30KG L 510 420 6 GJB 2351-1995
Weight>30KG L 510 420 5
Die forgings T6 Weight≤30KG L 530 440 6
Weight>30KG L 430 440 6
                   
 
Alloy Temper Aircraft type Application parts and typical part
7A04 Aluminum forgings forged product parts:T6、T652、T73、T7352 Y8, Y12 Skin, wallboard, all kinds of beams (backlogs, forgings), partition frame, wing ribs, long truss, joints, landing gear parts, etc.
 
 
Type Alloy       Projected area
(m2)Or weight(kg)
Temper Standard
Aluminum free forgings 5 series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Aluminum die forgings 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F
 



7049 aluminium forgings forged product parts are generally used to manufacture parts with the same static strength as 7079-T6 alloy and high stress corrosion cracking resistance, such as landing gear box, hydraulic cylinder and extrusion parts of aircraft and missile parts. The fatigue property of the parts is approximately the same as that of 7075 T6 alloy, but the willfulness is slightly higher.
The general states of 7049 aluminium forgings forged product parts are F, T6, T652, T73 and T7352.
On the basis of 7001 alloy, the content of alloying elements Cu and Cr is reduced, the ratio of Zn/Mg is increased, and the content of impurities Fe and Si is reduced. It is mainly used to produce forgings and backlogs in T73 state, as well as thick and thin plates. The stress corrosion crack growth rate of 7075 T6 alloy is much lower than that of 7075 T651 alloy.
 
                                                            7049 Aluminum Chemical Composition
Alloy Si Fe Cu Mn Mg Cr Ni Zn Ti Zr         Others Al
Single Total
7049 0.25    0.35 1.2~1.9 0.20 2.0~2.9 0.10~0.22 ~ 7.2~8.2 0.10 ~ 0.05 0.15 Rest
 
 
 
 
 
 
 
 
 
 
Alloy temper Main features Main products and status Application parts and typical parts
7049 The alloy for the purpose of replacing 7079 has high strength, good SCC resistance and poor corrosion resistance.  T73,T7352,T6,T652 Aircraft main landing gear, missile accessories.
 
 
 
Type Alloy Projected area(m2)or weight(kg) Temper           Standard
Aluminum free forgings 5 Series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 Series ≤3000kg T6、T4、O、F
Aluminum die forgings 5 Series ≤2.5m2 O、F
2、6、7 Series ≤2.5m2 T6、T4、O、F


7050 is a high strength Al-Zn-Mg-Cu alloy, which can be strengthened by heat treatment. On the basis of 7075 superhard aluminium alloy, the chemical composition of the alloy was adjusted, the content of zinc and copper was increased, the grain was refined by zirconium instead of chromium, and the content of impurities such as silicon and iron was reduced. Due to the optimization of chemical composition and the over-aging treatment, the aluminium alloy has high fatigue limit, good toughness, good stress corrosion resistance and good hardenability while maintaining high strength. Its hot working performance is similar to 7075 alloy. It has general weldability and good cutting property.
 
77050 is mainly used for high strength, good fracture toughness, and high stress corrosion cracking resistance and spalling corrosion of the main bearing structural parts, such as aircraft structure with thick plates, extrusions, free forgings and die forgings, such as aircraft structure with thick plates, extrusions, free forgings and die forgings, including fuselage frames, partitions, wing beams, landing gear support parts and rivets. Because the alloy has good hardenability, it is especially suitable for manufacturing large thick section parts. The supply state of the aluminum alloy includes T74, T76 and T73. T74 should be selected for structural parts requiring high strength and stress corrosion cracking resistance; T76 should be generally used for structural parts requiring high strength and anti-spalling corrosion; and T73 is mainly used for rivet materials requiring high strength and good corrosion resistance.
 

The Brinell hardness of 7050 aluminium alloy forging in T74 state is 158HBW.
7150 T77 aluminium forging forged product parts are an improved 7050 Alloy with high strength and good corrosion resistance. The fatigue resistance of 7150 T651 is 10%-15% higher than that of 7075, and the fracture toughness is 10% higher. The SCC resistance of 7150 T651 is similar to that of 7075. Mainly used in large passenger aircraft upper wing structure, body plate girder flange, upper outer panel main wing longitudinal beam, fuselage reinforcement, keel beam, seat guide rail.
 
Reduce heat treatment stress and avoid quenching deformation.
After solution treatment, the free forgings should be pre-compressed before artificial aging, and the permanent deformation is 1.5%-5.0%, so as to eliminate the internal stress.
The formability of the alloy is similar to that of 7075 aluminium alloy. If the initial forging temperature is too high, hot forging is easy to occur, which is disadvantageous to the hammer forging process.
 

                        Tensile Properties of 7050 Aluminum Alloy T73652 Free Forging at Room Temperature
 
Thickness/mm      Direction Tension strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Provision of non-proportional compressive strength
Rpc0.2/MPa
Elongation A
(%)
≤50 Portrait 496 434 441 9
Long transverse 490 421 448 5
>50--75 Portrait 496 427 434 9
Long transverse 483 414 441 5
Short transverse 462 379 421 4
>50--110 Portrait 483 421 427 9
Long transverse 476 407 434 5
Short transverse 455 379 421 4
 
7050 7150 Chemical Composition
Alloy Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Others Al
Single Total
7050 0.12 0.15 2.0~2.6 0.10 1.9~2.6 0.04 ~ 5.7~6.7 0.06 0.08~0.15 0.05 0.15 Rest
7150 0.12 0.15 1.9~2.5 0.10 2.0~2.7 0.04 ~ 5.9~6.9 0.06 0.08~0.15 0.05 0.15 Rest
 
 
 
 
 
 
Room Temperature Tensile Properties of Aluminum Alloy T736 State Die Forging
Thickness/mm      Direction Tension strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Provision of non-proportional compressive strength
Rpc0.2/MPa
Elongation A
(%)
≤50 portrait 496 427 434 7
transverse 469 386 400 5
>50--100 portrait 490 421 434 7
transverse 462 379 393 4
>100--125 portrait 483 414 434 7
transverse 455 372 379 3
 
Tensile Properties of 7050 Aluminum Alloy T736 State Die Forging at Room Temperature
Thickness/mm      Direction Tension strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Provision of non-proportional compressive strength
Rpc0.2/MPa
Elongation A
(%)
≤50 portrait 496 427 434 7
transverse 469 386 400 5
>50--100 portrait 490 421 434 7
transverse 462 379 393 4
>100--125 portrait 483 414 434 7
transverse 455 372 379 3
 
 
 
Low Temperature Tensile Properties of 7050 Aluminum Alloy Forgings
Alloy Temper Temperature Tension Strength Rm/MPa Prescribed plastic elongation strength  Rp0.2/MPa Elongation A
(%)
7050  T73652 -195 662 572 13
-80 586 503 14
-28 552 476 15
 
 
Tensile Properties of 7050 Aluminum Alloy Forgings at High Temperature
Alloy Temper Temperature/℃ holding time/h Tension Strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Elongation A
(%)
7050  T73652 24 - 524 455 15
100 0.1--10 462 427 16
100 469 434 16
1000 462 427 17
150 0.1 414 386 17
10 407 386 18
100 365 352 20
1000 290 276 23
175 0.1 379 345 19
10 324 310 22
100 248 234 25
1000 193 172 31
205 0.1 324 290 22
10 221 207 27
100 165 152 32
1000 131 110 45
 

Room Temperature Shear Properties of 7050 Aluminum Alloy Forgings
  Temper Shear strength of the following thickness  MPa
≤50mm >50--100mm >100--125mm
Aluminum free forging T73652 290 283 283
  Aluminum die forging T736 290 283 283
 
 
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
  Aluminum die forging 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F
 
 
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
 
 
7175 improves the purity of 7075 alloy. It is mainly used as die forgings. It has three heat treatment states: T66, T74 and T7452. Among them, the static strength of T66 forging is higher than that of 7075 T6 forging, while fatigue, crack resistance and stress corrosion resistance are equivalent. The static strength of T74 die forging and free forging is similar to that of 7075 T6 forging, and the stress corrosion resistance balance is between 7075 T73 and 7075 T76, while the toughness and fatigue properties are comparable to or even better than 7075 T73 forging. The stress corrosion resistance of T74 state is obviously higher than that of 7075 T6 state, approaching 7075 T73 state.
 
7175 alloy is specially used to produce forgings and rolling rings. The material state is T74. The characteristics of 7175 T74 aluminium alloy forgings are that special processing and heat treatment processes are adopted to make the strength close to 7075 T6 alloy forgings and the stress corrosion resistance close to 7075 T73 forgings in the best corrosion state. The reduction of Fe and Si rolling can not only improve the forging properties of the alloy, but also significantly improve the stress corrosion resistance and fracture toughness of the forgings.
 
7175 7075 Aluminum Alloy Chemical Composition
Alloy Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Others Al
Single Total
7175 0.15 0.20 1.2~2.0 0.1 2.1~2.9 0.18~0.28 ~ 5.1~6.1 0.10 ~ 0.05 0.15 Rest
7075 0.40    0.50 1.2~2.0 0.3 2.1~2.9 0.18~0.28 ~ 5.1~6.1 0.20 ~ 0.05 0.15   Rest
7075 aluminium forgings are high strength deformed aluminium alloys strengthened by heat treatment at any time. They can produce products of various kinds and sizes. They are the most widely used high strength aluminium alloys at present. It has several heat treatment states: T6, T73 and T76. The strength of T6 state is the highest, but the fracture toughness is low.


Technical Indicators for 7075 T74 Aluminum Alloy Forging
Direction Rm/MPa Rp0.2/MPa A5/% KIC/(N.mm-2).m1/2 Conductivity/(MS.m-1)
portrait 490 420 9 33.0 22.6
Long transverse 483 400 5 27.5
 Section transverse 469 393 4 23.1
 
Calibrated Mechanical Properties of 7175 T74 Alloy Rolled Forged Ring (YS/T 478)
Direction Thickness/mm Tension Strength Rm/MPa Yield strength Rp0.2/MPa Elongation A5/%
L <80 ≥505 ≥435 ≥8
 
 
Alloy Temper Aircraft model Application parts and typical parts
7175 T74
 
A320、Z10、EC120 etc。 Front edge, window frame, fairing joint, control parts, etc.
 
Type Alloy Projected area(m2)Or weight(kg) Temper Standard
Aluminum free forging 5 series ≤3000kg O、F 、T74
 
GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Aluminum die forging 5 series ≤2.5m2 O、F
2、6、7series ≤2.5m2 T6、T4、O、F、T74
 
 

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