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