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This specification replaces the part regarding structural sheet in GJB 2053-1994 Specification for aluminum alloy sheet for aerospace.
The following main changes have been made with respect to GJB 2053-1994 (the previous edition):
——The part regarding surface sheet is deleted;
——Several alloys are added, namely 2B06, 2D12, 7B04, 2024, 5083, 5086 and 7075;
——The two statuses, i.e. T73 and T74, are added.
This specification was proposed by the former Military Supporting Office of the State Economic and Trade Commission of the People's Republic of China.
This standard is under the jurisdiction of the Standards and Metrology Quality Research Institute of China Nonferrous Metals Industry.
This specification was issued on September 1994 for the first time.
Specification for aluminum alloy structural sheet for aerospace
1 Scope
This specification specifies the requirements, quality assurance provision and delivery preparation of aluminum alloy structural sheet for aerospace.
This specification is applicable to aluminum alloy structural sheet for aerospace (hereinafter referred to as sheet).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition
GB/T 3199 Wrought aluminium and aluminium alloy products - Packing marking transporting and storing
GB/T 3246.1 Wrought aluminum and aluminum alloys products inspection method for microstructure
GB/T 3246.2 Wrought aluminum and aluminum alloys products inspection method for macrostructure
GB/T 6987 (all parts) Methods for chemical analysis of aluminium and aluminium alloys
GB/T 7999 Photoelectric spectral analysis method of aluminum and aluminum alloys
GB/T 12966 Method for determining aluminium alloys conductivity using eddy current
GB/T 16865 Test pieces for tensile test for wrought aluminum and magnesium alloy products
GB/T 17432 Methods for sampling for analyzing the chemical composition of wrought aluminum and aluminum alloys
GJB 1536-1992 Specification for aluminum alloy (LC19) sheets
GJB 1694 Specification for heat treatment of wrought aluminum alloy
3 Requirements
3.1 Grade, status, type of aluminum clad and specification
The supply status, type of aluminum clad and specifications of 2B06, 2D12 and 7B04 sheets shall meet those specified in Table 1, and those of other alloy grades shall meet those specified in Table 2.
Table 1
Grade Status Type of aluminum clad Specification
mm
Thickness Width Length
2B06 and 2D12 O Normal aluminum clay 0.3 and 0.4 1000 and 1200 2000~3000
0.5~0.7 1000~1600 2000~4000
>0.7~6.0 1000~2000 2000~7000
T4 Normal aluminum clay 0.3 and 0.4 1000 and 1200 2000~3000
0.5~0.7 1000~1600 2000~5000
>0.7~6.0 1000~2000 2000~7200
7B04 O Normal aluminum clay 0.5~0.7 1000~1500 2000~4000
>0.7~6.0 1000~2000 2000~7000
T6, T73 and T74 Normal aluminum clay 0.5~0.7 1000~1500 2000~4000
>0.7~4.0 1000~2000 2000~7200
>4.0~6.0 1000~2000 2000~7000
Table 2
Grade Status Type of aluminum clad Specification
mm
Thickness Width Length
1050AH and 1060
1070A and 1200 O, H14 and H24 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
H18 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~3.0 1000~2400
3A21 O, H14, H24 and H18 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
2A06 O and T4 Normal aluminum clay 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
T0 Normal aluminum clay 1.5 1000~1500 2000~4000
>1.5~4.0 1000~1500 2000~10000
>4.0~6.0 1000~1500 2000~5500
T9 Normal aluminum clay 1.5 1000~1500 2000~4000
>1.5~4.0 1000~1500 2000~10000
>4.0~6.0 1000~1500 2000~5500
2A11 O and T4 Normal aluminum clay 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
2A12 O and T4 Normal aluminum clay
No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
Thickened aluminum clad 0.5~0.6 1000~1500 2000~4000
>0.6~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
T0 Normal aluminum clay
No aluminum clad 1.5 1000~1500 2000~4000
>1.5~4.0 1000~1500 2000~10000
>4.0~6.0 1000~2400 2000~5500
2A16 O, T4 and T6 Normal aluminum clay 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
2024 O Normal aluminum clay
No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
T4 Normal aluminum clay 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~3.2 1000~2400
No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
5A02 O, H14 and H24 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
H18 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
5A03 O, H14 and H24 No aluminum clad 0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~4.5 1000~1500 2000~5500
5A05 and 5A06 O No aluminum clad 0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~4.5 1000~1500 2000~5500
5083 and 5086 O, H14 and H24 No aluminum clad 0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
6A02 O, T4 and T6 No aluminum clad 0.3~0.5 1000~1500 2000~4000
>0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
7A04 and 7A09 O and T6 Normal aluminum clay 0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
T9 Normal aluminum clay 1.2~1.5 1000~1500 2000~4000
>1.5~4.0 1000~1500 2000~10000
>4.0~6.0 1000~1500 2000~5500
7075 O Normal aluminum clay
No aluminum clad 0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
T6 Normal aluminum clay
No aluminum clad 0.5~0.8 1000~1800 2000~10000
>0.8~2.0 1000~2000
>2.0~4.0 1000~2400
>4.0~6.0 1000~1500 2000~5500
For sheets with thickness less than 0.5mm, the technical department of the manufacturer shall be consulted when ordering.
For 2A12, 2024 and 7075 alloys, the type of aluminum clad shall be indicated in the contract when ordering, otherwise, the type of aluminum clad shall be considered as normal aluminum clad.
For 5A06, 2A12, 2024, 7075 alloy sheets which are without aluminum clad, the manufacturer may carry out art aluminum clad according to process requirements.
3.2 Chemical composition
The chemical compositions of 2B06, 2D12 and 7B04 sheets shall meet those specified in Table 3, and those of other alloy grades shall meet those specified in GB/T 3190.
Table 3
Chemical composition, ≤
Mass fraction
%
Grade Si Fe Cu Mn Mg Cr Ni Zn Be Ti Others Al
Single Total
2B06 0.20 0.30 3.8~4.3 0.40~0.9 1.7~2.3 — — 0.10 0.0002~0.005 0.10 0.05 0.10 Allowance
2D12 0.20 0.30 3.8~4.9 0.30~0.9 1.2~1.8 — 0.05 0.10 — 0.10 0.05 0.10 Allowance
7B04 0.10 0.05~0.25 1.4~2.0 0.20~0.6 1.8~2.8 0.10~0.25 0.10 5.0~6.5 — 0.05 0.05 0.10 Allowance
3.3 Dimensional deviation and shape
3.3.1 Thickness tolerance
The thickness tolerance of 2B06, 2D12 and 7B04 alloy sheets shall meet those specified in Table 4, and that of other alloy sheets shall meet those specified in Table 5.
Table 4
In: mm
Thickness Thickness tolerance on specified width
1000 >1000~1200 >1200~1500 >1500~2000
0.3 -0.10 — — —
0.4 -0.10 -0.12 — —
0.5 -0.10 -0.12 -0.12 —
>0.5~0.7 -0.12 -0.12 -0.13 —
>0.7~0.9 -0.12 -0.13 -0.14 -0.16
>0.9~1.0 -0.15 -0.16 -0.17 -0.18
>1.0~1.2 -0.15 -0.16 -0.17 -0.20
>1.2~1.9 -0.20 -0.22 -0.25 -0.26
>1.9~2.0 -0.20 -0.24 -0.26 -0.27
>2.0~2.5 -0.25 -0.28 -0.29 -0.30
>2.5~3.0 -0.30 -0.30 -0.34 -0.35
>3.0~3.5 -0.30 -0.32 -0.35 -0.36
>3.5~4.5 -0.30 -0.35 -0.36 -0.37
>4.5~5.5 -0.35 -0.36 -0.37 -0.38
>5.5~6.0 -0.40 -0.41 -0.42 -0.43
Table 5
In: mm
Thickness Thickness tolerance on specified width
1000 >1000~1500 >1500~2000 >2000~2400
0.3~0.4 ±0.05 ±0.06 — —
>0.4~0.63 -0.10 -0.12 -0.18 -0.24
>0.63~0.8 -0.12 -0.14 -0.18 -0.26
>0.8~1.0 -0.15 -0.17 -0.20 -0.29
>1.0~1.2 -0.15 -0.17 -0.22 -0.29
>1.2~1.6 -0.20 -0.25 -0.27 -0.29
>1.6~2.0 -0.20 -0.26 -0.28 -0.30
>2.0~2.5 -0.25 -0.29 -0.30 -0.32
>2.5~3.2 -0.30 -0.34 -0.35 -0.36
>3.2~4.0 -0.30 -0.36 -0.37 -0.38
>4.0~5.0 +0.10
-0.35 +0.10
-0.37 +0.10
-0.42 +0.10
-0.45
>5.0~6.0 +0.10
-0.40 +0.10
-0.42 +0.10
-0.42 +0.10
-0.45
3.3.2 Width tolerance
The width tolerance of 2B06, 2D12 and 7B04 alloy sheets shall meet those specified in Table 6, and that of other alloy sheets shall meet those specified in Table 7.
Table 6
In: mm
Thickness Width tolerance
0.3~3.5 +6
>3.5~6.0 +10
Table 7
In: mm
Thickness Width tolerance on specified width
1000 >1000~2000 >2000~2400
0.3~3.2 ±2.5 ±3 ±4
>3.2~4.5 ±3 ±3.5 ±4.5
>4.5~6.0 +8 +9 +11
3.3.3 Length tolerance
The length tolerance of sheet shall meet those specified in Table 8.
Table 8
In: mm
Thickness Length tolerance
0.3~3.5 +8
>3.5~6.0 +25
3.3.4 Shape
The unevenness of 2B06, 2D12 and 7B04 alloy sheets in annealing, solid solution and aging statuses shall meet those specified in Table 9. The unevenness of 5A03, 5A05 and 5A06 alloy sheets shall meet those specified in Table 10, and that of other alloy sheets shall meet those specified in Table 11.
Table 9
In: mm
Corresponding thickness Corresponding length Unevenness on specified width, ≤
≤1200 >1200~1600 >1600~2000
End position Other position End position Other position End position Other position
0.3 and 0.4 ≤3000 30 20 — — — —
0.5~0.8 ≤7200 20 14 20 16 — —
0.8~1.5 ≤4000 20 14 20 16 40 20
>4000~7200 20 14 20 16 45 23
>1.5~2.0 ≤4000 30 18 30 18 40 20
>4000~7200 30 18 30 18 45 23
>2.0~4.0 ≤4000 30 18 30 18 50 24
>4000~7200 30 18 30 18 50 25
>4.0~6.0 ≤4000 40 20 40 22 50 24
>4000~7200 40 20 40 22 50 25
Note: The end position refers to the sheet surface included within a length range of 300 mm at both ends in the length direction of the sheets. If the sheet is square, the end position is the sheet surface of the square ring enclosed by 300mm around the edges.
