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6 Series Alu Forging

6A02 is a forged Al-Mg-Si alloy, which can be strengthened by heat treatment. After solution treatment and aging treatment, the aluminium alloy has medium strength, high plasticity in annealing state, high plasticity in hot state and easy forging and stamping. Its corrosion resistance is good, similar to that of rust-proof aluminium 3A21 and 5A02, but with intergranular corrosion tendency. The aluminium alloy is easy to spot welding and atomic hydrogen welding, and has good gas welding performance. It has poor machinability in annealing state and can be quenched and aged.
 
A forged aluminium widely used in industry at 6A02 is used to manufacture parts that require high plasticity and corrosion resistance to cut and bear medium loads. It can also be used to make forgings with complex shapes, such as crankcase of air-cooled engine, blade of helicopter, engine parts of aircraft, forgings with complex shapes and die forgings, which require mechanical parts with high plasticity and corrosion resistance, and working temperature of parts. The range of degree is - 70 - 50 ℃
 
.The Brinell hardness of the aluminium alloy is 30HBW in O state, 65HBW in T4 state and 85-95HBW in T6 state.
 
High Temperature Tensile Properties of 6A0 Alloy
  Temper Direction Tension Strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Elongation  A
(%)
Free forgings T6 Portrait 275 -- 10
Mould forgings T6 Portrait 295 215 12
 
 
The time interval between solution treatment and artificial aging treatment of 6A02 aluminium alloy should be less than 6h in order to avoid its mechanical properties decreasing.
 
For parts under heavy and alternating loads, the artificial aging treatment should be 150 - 160 ℃ and heat preservation for 8 hours. In this way, although the strength of the part is reduced, the difference between the tensile strength and yield strength is increased, and the plasticity is improved, which can improve the working performance of the part.
 
6A02 aluminium alloy has high process plasticity in hot state and is easy to forge. Its forging temperature range is 470-380 ℃.
 
Type Alloy Projected area(m2)Or weight(kg) Temper Standard
Free forgings 5 series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Mould forgings 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F


6061 is a forged Al-Mg-Si alloy, which can be strengthened by heat treatment. The alloy has medium strength and high plasticity after solution heat treatment and aging treatment. The corrosion resistance and weldability of the alloy are better, but the corrosion resistance is slightly worse than that of 6A02 alloy, while the corrosion resistance of 6061 alloy clad aluminium products is significantly improved. Its machinability is medium to low.
 
 
6061 and 6063 Aluminium alloys are universal aluminium alloys in the world. They are widely used, especially in the construction industry. Modern high-rise buildings can not do without these two alloys. It is mainly used to produce light-weight structural parts such as doors, windows, benches, etc. It is also used to manufacture structural parts with high corrosiveness, good weldability and medium strength, such as structures of freight cars, trains and yachts, towers, pipelines, etc. Now it is widely used in forgings of automobiles, motorcycle control arms, wheel hubs, bicycle parts and so on.
 
Low Temperature Tensile Properties at Different Temperatures of 6061 alloy
Temper Temperature/℃ Tensile strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Elongation A
(%)
T6、T652 -196 414 324 22
       -80 338 290 18
       -28 324 283 17
       25 310 276 17
 
Tensile Properties at High Temperature at Different Temperatures of 6061 alloy
Temper Temperature/℃ Tensile strength Rm/MPa Prescribed plastic elongation strength  Rp0.2/MPa Elongation A
(%)
T6、T652 100 290 262 18
150 234 214 20
205 131 103 28
260 51 34 60
315 32 19 85
370 24 12 95
 
 
For parts manufactured from rolling or drawing materials, it is advisable to heat them at 160 C for 18 h by artificial aging treatment, and for parts manufactured by extrusion or forging, it is advisable to heat them at 175 C for 8 h by artificial aging treatment.
 
 
6061 aluminium alloy has high technological plasticity under reheating condition, which is suitable for free forging and die forging to produce various forgings.
 
Type Alloy Projected area(m2)Or weight(kg) Temper Standard
Free forgings 5 series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Mould forgings 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F
 

Both 6063 and 6063A are forged Al-Mg-Si alloy, which can be strengthened by heat treatment. 6063A alloy belongs to high quality product, its chemical composition and quality are stricter than 6063 aluminum alloy. The two kinds of aluminium alloys have medium strength and high plasticity after solution heat treatment and aging treatment. The corrosion resistance of the alloy is slightly better than that of 6061 aluminum alloy. Good weldability, medium to low machinability of alloy.
 
6063 and 6061 aluminium alloys are universal aluminium alloys in the world. They are widely used, especially in the construction industry. Modern high-rise buildings can not do without these two alloys. It is mainly used to produce light-weight structural parts such as doors, windows, benches, etc. It is also widely used in movable houses, medical and health supplies, office appliances, etc. It is also used to manufacture structural parts with high corrosion resistance, good weldability and medium strength, such as vehicles, boats, mechanical parts, etc.
 
Tensile properties and hardness at room temperature of 6063 alloy
Temper Tension strength Rm/MPa Prescribed plastic elongation strength  Rp0.2/MPa Elongation A
(%)
Hardness HBW
O 90 48 - 25
T1 152 90 20 42
T4 172 90 22 -
T5 186 145 12 60
T6 241 214 12 73
T83 255 241 9 82
T831 207 186 10 70
T832 290 269 12 95
 
 
Tensile properties and hardness at high temperature of 6063 alloy
   Temper Temperature/℃ Tension strength Rm/MPa Prescribed plastic elongation strength  Rp0.2/MPa Elongation A
(%)
T4 100 152 97 18
150 145 103 20
205 62 45 40
260 31 24 75
315 23 17 80
370 16 14 105
T5 100 165 138 18
150 138 124 20
205 62 45 40
260 31 24 75
315 23 17 80
370 16 14 105
T6 100 214 193 15
150 145 133 20
205 62 45 40
260 31 24 75
315 23 17 80
370 16 14 105
 
 
Low Temperature Tensile Properties of 6061 Alloy
Temper Temperature /℃ Tension strength Rm/MPa Prescribed plastic elongation strength  Rp0.2/MPa Elongation A
(%)
T4 -196 234 110 44
-80 179 103 36
-28 165 97 34
25 152 90 33
T5 -196 255 165 28
-80 200 152 24
-28 193 152 23
25 186 145 22
T6 -196 324 248 24
-80 262 228 20
-28 248 221 19
25 241 214 18
 
6063 and 6063A alloys have high process plasticity in hot state. They can extrude or forge profiles and forgings of various cross-section shapes.
 
 
For parts in T5 state, the temperature of artificial aging treatment can be increased to 185 - 200 ℃ for 1 hour.
 
Type Alloy Projected area(m2)Or weight(kg) Temper Standard
Free forgings 5 series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Mould forgings 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F
 

6151 alloy T6 T652 aluminum forgings are generally used for forging crankshaft parts. Machine parts and rolling ring conducting mine and machine parts have good forgability, high strength and corrosion resistance. All parts requiring good forging performance, high strength and good corrosion resistance can be processed with this alloy.
 
Process characteristics
 
The annealing standard of 6151 alloy is 413℃/(2h~3h). The cooling rate of 6151 alloy is not more than 27℃/h. The alloy is cooled to 260 ℃ with the furnace, and then air-cooled out of the furnace. Solid solution treatment temperature (510℃~525℃)/4min, quenching in room temperature water, quenching in 65℃~100℃ water for large forgings. Artificial aging code(165℃~175℃)/(8h~12h). The hot working temperature ranges from 260 ℃ to 480 ℃.

Mechanical property
The minimum mechanical properties of 6151 alloy are 50mm or 4D (d is sample diameter). 6151 alloy has no low temperature brittleness and can be used to process parts working at extremely low temperature. At 25 ℃, the tensile strength Rm = 330N/mm2, yield strength Rp0.2 = 298N/mm2, elongation A = 17%, and temperature drops to 200 ℃, the properties of 6151 alloy increase completely, reaching 395N/mm2, 345N/mm2 and 20%, respectively. The working temperature of 6151 alloy should not exceed 120 ℃.
 
Alloy Si Fe Cu Mn Mg Cr Ni Zn Ti Ga Others Alu
Each Toal  
6151 0.6--1.2 1.0 0.35 0.20 0.45--0.8 0.15--0.35 -- 0.25 0.15 -- 0.05 0.15 Remainder
 
Tensile mechanical properties of 6151 aluminium alloy forgings
Temper Tension strength Rm/MPa Prescribed plastic elongation strength Rp0.2/MPa Elongation A
(%)
Mould forgings T6 Axis parallel to grain flow direction 303 225 14
Axis parallel to grain flow direction 303 255 6
Forged ring T6、T652 Radial direction 303 255 5
Axial direction 303 241 4
Radial direction 290 241 2
 
Type Alloy Projected area(m2)Or weight(kg) Temper Standard
Free forgings 5 series ≤3000kg O、F GBn223
    ASTMB247
2、6、7 series ≤3000kg T6、T4、O、F
Mould forgings 5 series ≤2.5m2 O、F
2、6、7 series ≤2.5m2 T6、T4、O、F
 

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