7A04 /7B04 Aircraft Aerospace Aluminum Extrusions Structural Shapes For Aviation

7A04/7B04 Aircraft Aerospace Aluminum Extrusions Structural Shapes for Aviation

7A04 Aluminum alloy sheet plate profile forgings
7A04 aluminum alloy sheet plate profile forgings is a heat treatment and strengthening alloy of Al-Zn-Mg-Cu system. Its strength is higher than that of hard aluminum. It is characterized by its yield strength close to tensile strength and plasticity, and its sensitivity to stress concentration is strong, especially when subjected to vibration load and repeated static load. Therefore, the design of parts, the manufacturing process and the assembly process need to strictly avoid the stress concentration and the formation of additional stress. The heat resistance of the alloy is poor, and it will soften rapidly when the temperature is higher than 125, and the stress corrosion resistance of thick and thick parts is poor in short and transverse.

The main stress parts of 7A04 alloy aluminum alloy sheet plate profile forgings is widely used in aircraft structures, such as beams and stringers, bulkheads, ribs, skin, joints, undercarriage parts etc.. It can produce all kinds of semi-finished products, such as plate, strip, section, bar, wall, pipe, wire, free forgings and die forgings.

Chemical composition of 7A04 alloy

Alloy

Others

Each

Total

7A04

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

Remainder

Alloy	Alloy series	Mean features	σb Value/MPa	Working temperature/ºC
7A04	B95(Russia)	The yield strength to tensile strength, low ductility, sensitivity to stress concentration effects, especially the repeated static load under vibration load and the situation is more obvious, therefore need to strictly avoid stress concentration factor and the formation of additional stress in parts of the design, manufacture and assembly process. The short transverse stress corrosion resistance of the thick and large parts of the alloy is poor. There are mainly plate and extrusion parts.	480~570	<125

Physical Property of 7A04 Aluminum alloy sheet plate profile forgings
Alloy	Type	Temper	δ size/mm	Direction	σ_b/MPa	σ_{p 0.2}/MPa		δ %	Standard
7A04	Aluminum Plate	T6	1.0~2.5	LT	480		410	7	GJB 2053-1994
		T6	>2.5	LT	490		420	7
		T9	2.0~4.0	LT	520		450	7
		T6	7.0~10.0	L	490		410	6	GJB 2662-1996
			>10~25	L	490		410	4
			>25~40	L	490		410	3
	Extruded aluminum profile	T6	7.0~10.0	L	490		370	7	GJB 2054-1994
	Extruded aluminum profile	T6	>10~25	L	530		400	6	GJB 2054-1994
	Extruded aluminum profile	T6	≤10	L	510		460	6	GJB 2057-1995
			>10~20	L	530		460	6
			>20~40	L	560		460	6
			>40	L	570		490	6
	Free forgings	T6	Weight≤30KG	L	510		420	6	GJB 2351-1995
	Free forgings	T6	Weight>30KG	L	510		420	5
	Die forgings	T6	Weight≤30KG	L	530		440	6
	Die forgings	T6	Weight>30KG	L	430		440	6

Alloy	Temper	Aircraft type	Application parts and typical parts
7A04	Aluminum plate: T6,T9 Aluminum forgings:T6 Aluminum profile: T6	Y8, Y12	Skin, wall board, all kinds of beams (backlog, forgings), frame, fin, long truss, joint, landing gear and so on.

Chemical Composition of 7A04 Alloy

Alloy

Others

Each

Total

7B04

0.10

0.25

1.4~2.0

0.20~0.60

1.8~2.8

0.15~0.25

5.0~6.5

0.05

0.15

Remainder

7B04 aluminum alloy sheet profile forgings

7B04 alloy is further purified and developed on the basis of long term use of 7A04 alloy. That is to improve its fracture toughness properties by controlling Fe and Si impurity elements. 7B04 alloy has been used in T6 state for a long time, and its strength is high. The characteristic is that the yield strength is close to the mild tensile, low plasticity and poor stress corrosion resistance.
7B04 aluminum alloy sheet profile forgings is a relatively mature high purity aluminum alloy in China. It is a large aluminum alloy used on military aircraft in China. Parts of the machine account for 60% of the total aluminum alloy consumption, and the consumption of the single machine is about 20t, which achieves stable batch supply. Varieties include plates, thick plates, profiles, extruded panels, bars and forgings. The successful application of 7B04 alloy to military aircraft provides valuable experience for the promotion of domestic new materials in military and civil aircraft.

Alloy	Alloy Series	Main Features	σb Value/MPa	Working Temperature/ºC
7B04	B95(Russia)	The fracture toughness of 7A04 alloy is higher than that of 7A04 alloy by 10%~15%. The main varieties are sheet, profile, extruded wall plate and bar, forgings and so on. There are three kinds of T6, T73 and T74 in use. The ingot of this alloy is more difficult than 7A04 alloy. It is suitable for hot forming, such as rolling, extrusion, forging and so on. It can make all kinds of parts of size and shape.	440~590	<125

Mechanical properties of 7B04 aluminum alloy
Alloy	Type	Temper	δ Size/mm	σ_b/MPa	σ_{p 0.2}/MPa	δ %		K_{IC or}K_C	Standard
7B04	Aluminum sheet	T6	0.5~1.9	480	400		7	-	11-CL-027B
			>1.9~6.0	490	410		7
			>6.0~10.5	490	410		6
		T74	0.5~1.9	450~530	380~470		8
			>1.9~4.5	460~540	380~470		8
			>4.5~6.0	480~560	400~490		8
			>6.0~10.5	470~550	390~480		8
		T73	0.5~1.9	430~530	345~420		8
			>1.9~4.5	440~510	355~430		8
			>4.5~10.5	450~520	375~450		8
		0-T6	0.5~1.0	470	390		7
			>1.0~6.0	480	400		6
			>6.0~10.5	480	400		6
	Aluminum Skin plate	T6B	0.5~1.9	480	400		7	-	11-CL-026B
			>1.9~6.0	490	400		7
			>6.0~10.5	490	410		6
		T74B	0.5~1.9	450~530	380~460		8
			>1.9~4.5	460~540	380~460		8
			>4.5~6.0	480~560	400~480		8
			>6.0~10.5	470~550	390~470		8
		T73B	0.5~1.9	430~550	345~420		8
			>1.9~6.0	440~510	355~430		8
			>6.0~10.5	450~520	375~450		8
		T62B	0.5~1.9	470	390		7
			>1.9~6.0	480	400		7
			>6.0~10.5	480	400		6
	pre-stretching aluminum plate	T651	11~25	530	460		7	-	CL-029B SWA/S1201-2002
			26~50	530	460		6
			51~60	520	440		5
			61~80	490	420		4
		T7451	11~50	490~560	420~500		7
			51~60	470~540	380~460		6
			61~85	460~530	365~440		6
		T7351	11~50	470~540	400~480		7
			51~60	450~520	365~440		6
			61~85	440~510	345~420		6
	Extruded Aluminum bar rod	H112--T6	10~28	560	480		6		11-CL-031B
			>28~150	570	490		6
			>150~250	560	490		6
			>250~300	550	480		6
		T6	10~50	560	480		6
			>50~100	570	490		6
	Extruded aluminum profile	H112--T6	≤5	510	460				11-CL-028B
			>5~10	520	470
			>10~75	540	480
			>75~112	540	470
			>112~125	520	450
		O--T6	≤5	510	460
			>5~10	520	470
			>10~75	540	480
			>75~112	540	470
			>112~125	520	450
		T6	≤5	510	460
			>5~10	530	480
			>10~75	550	490
			>75~112	550	480
			>112~125	530	460
		T74	≤75	510~590	450~530
			>75~125	490~590	420~530
		T73	≤5	460~530	390~460
			>5~40	480~550	420~490
			>40~75	470~540	400~470
			>75~125	460~530	390~460
	Extruded wallboard	T6	All	L:540	490		7		11-CL-030B
LT:510				-		6
T742		All	500~570	430~500		8
Die forgings	T6	≤75	L:510	430		6	L-T: 31.0 T-L: 21.7 S-L:18.6
			LT:450	-		4
			ST:410	-		3
		>75~150	L:510	430		6
			LT:450	-		4
			ST:410	-		2
Free forgings	T6	≤75	L:490	410		6	-
			LT:440	-		3
			ST:390	-		2
		>75~150	L:490	410		5
			LT:440	-		3
			ST:390	-		2
Die forgings	T74	≤75	L:490~580	430~520		6
			LT:460~540	410~490		4
			ST:450~520	400~470		2
		>75~100	L:480~570	420~510		6
			LT:460~540	410~490		4
			ST:450~520	390~470		2
Free forgings	T74	≤75	L:480~570	410~490		6
			LT:460~540	400~480		4
			ST:450~520	390~470		2
		>75~100	L:470~560	400~480		6
			LT:460~540	390~470		4
			ST:440~520	390~470		2
		>100~125	L:450~540	390~470		6
			LT:440~520	370~450		3
			ST:420~500	380~460		2
Die forgings	T73	≤75	L:450~540	380~470		7	L-T: 35.7 T-L: 26.4 S-L:21.7
			LT:440~520	370~450		5
			ST:420~500	-		3
		>75~100	L:440~530	370~460		7

Alloy	Temper	Aircraft Models	Application parts and typical parts
7B04	Aluminum sheet: T6,T74,T73,T6B,T74B,T73B,T62B. Aluminum plate:T651,T7451,T7351 Aluminum profile: T6,T74,T73,T6,T742 Aluminum forgings:T6,T74,T73	Y8, Y12	Skin, wall board, all kinds of beams (backlog, forgings), frame, fin, long truss, joint, landing gear and so on.

7A04 /7B04 Aircraft Aerospace Aluminum Extrusions Structural Shapes for Aviation

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