Comparison Table of Aluminum Alloy Grades of China and United States
CHINA
THE UNITED STATES
L1-L6 、 L5-1
1070 、1060 、 1050 、 1030 、 1100
LY11 、 LY12 、 LY1
2017 、 2024 、 2117
LD10 、 LD5
2014 、 2214
LD7
2618
LD9 、 LD8
2018 、 2218
LY16 、 LY17
2219 、 2021
LF21
3003
LF2 、 LF3 、 LF4
5052 、 5154 、 5083
LF5 、 LF11 、 LF6 、 LF5-1
5456 、 5056
LD2 、 LD2-1 、 LD2-2 、 LD30 、 LD31
6165 、 6061 、 6055 、 6063
LC6 、 LC4 、 LC9
7001 、 7178 、 7075
LC5 、 LC10
7076 、 7175 、 7079
LD11
4032

Comparison Table of Present and Former Alloy Grades of China（GB/T 3190-1996）
Present Grade
Former Grade
Present Grade
Former Grade
Present Grade
Former Grade
1A99
Former LG5
2B12
Former LY9
3003
－
1A97
Former LG4
2A13
Former LY13
3103
－
1A95
－
2A14
Former LD10
3004
－
1A93
Former LG3
2A16
Former LY16
3005
－
1A90
Former LG2
2B16
Before Ly16-1
3105
－
1A85
Former LG1
2A17
Former LY17
4A01
Former LT1
1080
－
2A20
Before LY20
4A11
Former LD11
1080A
－
2A21
Before 214
4A13
Former LT13
1070
－
2A25
Before 225
4A17
Former LT17
1070A
Replaced L1
2A49
Before 149
4004
－
1370
－
2A50
Former LD5
4032
－
1060
Replaced L2
2B50
Former LD6
4043
－
1050
－
2A70
Former LD7
4043A
－
1050A
Replaced L3
2B70
Before LD7－1
4047
－
1A50
Former LB2
2A80
Former LD8
4047A
－
1350
－
2A90
Former LD9
5A01
Before 2101、LF15
1145
－
2004
－
5A02
Former LF2
1035
Replaced L4
2011
－
5A03
Former LF3
1A30
Former L4－1
2014
－
5A05
Former LF5
1100
Replaced LF5－1
2014A
－
5B05
Former LF10
1200
Replaced L5
2214
－
5A06
Former LF6
1235
－
2017
－
5B06
Former LF14
2A01
Former LY1
2017A
－
5A12
Former LF12
2A02
Former LY2
2117
－
5A13
Former LF13
2A04
Former LY4
2218
－
5A30
Before 2103、LF16
2A06
Former LY6
2618
－
5A33
Former LF33
2A10
Former LY10
2219
Before LY19、147
5A41
Former LT41
2A11
Former LY11
2024
－
5A43
Former LF43
2B11
Former LY8
2124
－
5A66
Former LT66
2A12
Former LY12
3A21
Former LF21
5005
－
5019
－
6B02
Former LD2－1
7A09
Former LC9
5050
－
6A51
Before 651
7A10
Former LC10
5251
－
6101
－
7A15
Before LC15、157
5052
－
6101A
－
7A19
Before 919、LC19
5154
－
6005
－
7A31
Before 183-1
5154A
－
6005A
－
7A33
Before LB733
5454
－
6351
－
7A52
Before LC52、5210
5554
－
6060
－
7003
Former LC12
5754
－
6061
Former LD30
7005
－
5056
Former LF5－1
6063
Former LD31
7020
－
5356
－
6063A
－
7022
－
5456
－
6070
Former LD2－2
7050
－
5082
－
6181
－
7075
－
5182
－
6082
－
7475
－
5083
Former LF4
7A01
Former LB1
8A06
Former L6
5183
－
7A03
Former LC3
8011
Before LT98
5086
－
7A04
Former LC4
8090
－
6A02
Former LD2
7A05
Before 705
－
－

Notes:
(1) 'Former' refers to grades that have the same chemical composition with present grades and are in compliance with GB3190－82;
(2) 'Replaced' refers to grades that have the similar chemical composition with present grades and are in compliance with GB3190－82;
(3) 'Before' refers to grades that have been applied before but not included in GB3190－82.
　
　
ALLOY SYSTEM
TEMPER
L -- Aluminum
R -- Heat Processing
LF --（Ai - Mg 、 Ai - Mn） Rust Prevention Aluminum Alloy
M -- Annealing
LY -- （Ai - Cu - Mg） Hard Aluminum Alloy
Y -- Hardening
LC -- （Ai - Cu - Mg - Zn ） Ultrahard Aluminum Alloy
C -- Quenching
LD -- （Ai - Mg - Si & Cu - Mg - Si） Forged Aluminum Alloy
CZ -- Quenching, Natural Ageing
LT -- Special Aluminum Alloy
CZY -- Quenching, Natural Ageing, Cold Working
-
CS -- Quenching, Manual Ageing
-
CSY -- Quenching, Manual Ageing, Cool Working
-
Y2 -- Semi Hard
-
RCS（T5）-- Air Cooling, Manual Ageing

(GB/T16475－1996) Basic State Code, Name, Description and Application
Code
Name
Description and Application
F
Free Processing

Applicable for products that have no special requirements on hardening and heat treatment during processing. The mechanical properties are not required.

O
Annealing

Applicable for products with the lowest strength after complete annealing
H
Processing and Hardening

Applicable for products that are hardened to improve the strength. The products can be additionally heat treated (not required) to reduce the strength after hardening. The H sould be followed by 2 or 3 digits.

W
Solid Solution Heat Treatment


An unstable state. Applicable only for alloys that are being natural ageing treated after solid solution heat treatment. The cide indicates that the product is in natural ageing state.

T
Heat Treatment (Different to F, O, H)

Applicable for products that have stable states via hardening (not required) after heat treatment. The T should be followed by 1 or more digits.


Comparison Table of Present and Former Original State Codes
（GB/T16475－1996）
Former Code
Present Code
Former Code
Present Code
M
O
CYS
TX51、TX52
R
H112 or F
CZY
T0
Y
HX8
CSY
T9
Y1
HX6
MCS
T62
Y2
HX4
MCZ
T42
Y4
HX2
CGS1
T73
T
HX9
CGS2
T76
CZ
T4
CGS3
T74
CS
T6
RCS
T5
Notes: The state of products that were delivered in R state or whose CZ and CS sample's performance was provided formerly is T62 and T42 respectively.

HXY Subdivided State Codes and Processing Hardness

Subdivided State Code
Processing Hardness
HX1
The tensile strength limit is between 0 and HX2 states.
HX2
The tensile strength limit is between 0 and HX4 states.
HX3
The tensile strength limit is between HX2 and HX4 states.
HX4
The tensile strength limit is between 0 and HX8 states.
HX5
The tensile strength limit is between HX4 and HX6 states.
HX6
The tensile strength limit is between HX4 and HX8 states.
HX7
The tensile strength limit is between HX6 and HX8 states.
HX8
Hard
HX9
ltrahard, the minimum tensile strength limit is at least 10MPa higher than HX8.

Notes: When the tensile strength limit of HX1-HX9 state doesn't end with o or 5, the limit should be adjusted to the higher value in the neighboring figures end with 0 or 5.

Description and Application TX Subdivided State Codes
State Code
Description and Application
T0
 The state of alloy that is natural ageing treated and cold processed after solid solution heat treatment. Applicable for products that are cold processed to increase the strength
T1
 The stable state of alloy that is natural ageing treated after high temperature forming. Applicable for products that are not cold processed (straightening and flattening is allowed if mechanical properties are not changed) after high temperature forming
T2
 The stable state of alloy that is natural ageing treated after high temperature forming. Applicable for products that are cold processed, straightened or flattened to increase the strength after high temperature forming
T3
 The stable state of alloy that is cold processed and natural ageing treated after solid solution heat treatment. Applicable for products that are cold processed, straightened or flattened to increase the strength after solid solution heat treatment
T4
 The stable state of alloy that is natural ageing treated after solid solution heat treatment. Applicable for products that are not cold processed (straightening and flattening is allowed if mechanical properties are not changed) after solid solution heat treatment
T5
 The state of alloy that is manual ageing treated after high temperature treatment. Applicable for products that are manual ageing treated but not cold processed (straightening and flattening is allowed if mechanical properties are not changed) after high temperature forming
T6
 The state of alloy that is manual ageing treated after solid solution heat treatment. Applicable for products that are not cold processed (straightening and flattening is allowed if mechanical properties are not changed) after solid solution heat treatment
T7
 The state of alloy that is ageing treated after solid solution heat treatment. Applicable for products whose strength surmounts the peak point in ageing curve to maintain certain important properties during manual ageing treatment
T8
 The state of alloy that is cold processed, manual ageing treated after solid solution heat treatment. Applicable for products that are cold processed, straightened or flattened to increase the strength
T9
 The state of alloy that is cold processed, manual ageing treated after solid solution heat treatment. Applicable for products that are cold processed to increase the strength
T10
 The state of alloy that is cold processed, manual ageing treated after high temperature treatment Applicable for products that are cold processed, straightened or flattened to increase the strength
Notes: Some alloys in 6XX category can achieve the same solid solution heat treatment performance whether they are treated in furnaces, or rapid cooled during high-temperature forming to retain their soluble ingredients in solid solution. The T3, T4, T6, T7, T8 and T9 states of the alloys can be heat treated in either of the two methods.

Description and Application TXX and TXXX Subdivided State Codes
State Code
Description and Application
T42
 Applicable for products that are natural ageing treated to stable state after 0 or F solid solution treatment. Also applicable for any product that has the required mechanical properties of T42 after heat treatment
T62
 Applicable for products that are manual ageing treated after 0 or F state solid solution heat treatment. Also applicable for any product that has the required mechanical properties of T62 after heat treatment
T73
 Applicable for products that are ageing treated to required mechanical and stress corrosion resistant performance after solid solution heat treatment
T74
 Same to T73 state. The tensile strength is better than that of T73, but is lower than T76.
T76
 Same to T73 State. The tensile strength of this state is higher than that of T73 and T74 states. The stress corrosion and breaking resistant performance is lower than that of T73 and T74 states, but the flaking resistant resistant performance is better.
T72
 Applicable for products that are manual ageing treated and whose mechanical properties and corrosion resistance reach the T7X states after 0 or F solid solution heat treatment
T81
 Applicable for products that are about 1% cold processed and manual ageing treated to increase the strength after solid solution heat treatment
T87
 Applicable for products that are about 1% cold processed and manual ageing treated to increase the strength after solid solution heat treatment