ISO numbering method and status code of wrought aluminum alloy
1. Pure aluminum ingots for remelting. The pure aluminum grade produced by the electrolysis plant is composed of its chemical element symbol (Al) and the percentage number representing the purity of the metal. The number should be accurate to two or more digits after the decimal point, such as Al99.80.
2. Processed industrial pure aluminum and its alloys. Their grades are composed of chemical element symbols and percentage numbers representing metal purity or alloying elements. In industrial pure aluminum product grades, the number is only expressed to one decimal place, such as Al99.0. If the industrial pure aluminum product also contains alloying elements with a maximum amount of not more than 0.1% (with the exception of copper, 0.2%), the chemical symbol of the alloying element should be marked after the number, such as Al99.0Cu, which is the aluminum content It is 99.0%, and the copper content is less than 0.2% of industrial pure aluminum.
If some impurities in industrial pure aluminum are controlled and there is a special purpose, the capital letter of the purpose should be prefixed in front of the grade. For example, the grade of electrical aluminum with a purity of 99.5% Al is E-Al99.5.
The aluminum alloy grades are composed of the basic element Al and the chemical element symbols of the alloying elements and the average percentage number of the alloying element content. The number of alloying elements less than 1% is not marked. For example, an Al-Cu-Mn alloy with an average copper content of 6% and a Mn content of less than 1% is AlCu6Mn.
In the alloy grades, the chemical symbols of alloying elements are arranged in descending order according to their content. If their content is approximately equal, they are arranged in alphabetical order of the chemical element symbols.
The international standard also stipulates that the grades of deformed aluminum and aluminum alloys can be represented by four digits, that is, the grades of the American Aluminum Association, but the "AA" (abbreviation for "The Aluminium Association" of the American Aluminum Association") is removed.
Second, the state code of the processed aluminum According to the provisions of international standards, the state code of the aluminum is marked after the alloy grade, and they are separated by a hyphen. The material status code is composed of letters and numbers.
1. The basic state code refers to the basic state code of aluminum processing.
M---Manufacturing state, which means that the thermally formed material has certain requirements for its mechanical properties.
F---Processing state, which means the state of the thermally processed material that does not control the mechanical properties.
O---annealed state, which means the state of the fully annealed pressure-processed product with the lowest strength performance.
H---Work hardening state.
T---It is different from the heat treatment state of M, F, O and H to improve its strength and hardness.
2. Detailed classification of basic status codes H and T.
H1---Work hardening.
H2---partially annealed after work hardening.
H3 is stabilized after work hardening.
Add a letter after the number to indicate the final work hardening degree of the material (the letter x represents the number 1, 2, 3):
HxH---fully hardened state;
HxD---The tensile strength of the material is roughly between the O state and the HxH state;
HxB---The tensile strength of the material is roughly between the O state and the HxD state;
HxF---The tensile strength of the material is roughly between the HxD state and the HxH state;
HxJ---The tensile strength of the material is greater than that of the HxH state by more than 10MPa;
TA---cool to room temperature after the thermoforming process to make it in a natural aging state;
TB---Solid solution treatment and natural aging state;
TC---cooled to room temperature after hot working, then cold working and natural aging state;
TD---Solid solution treatment, cold working and natural aging state;
TE---The state after cooling from the thermoforming temperature to room temperature and then artificially aging;
TF---The state after solution treatment and artificial aging;
TG---The state after the hot working temperature is cooled to room temperature, then cold working and artificial aging, suitable for materials whose strength can be improved by cold working;
TH---The state after solution heat treatment, cold working and artificial aging;
TL---Solid solution heat treatment, artificial aging and cold working state;
TM---The state after solution heat treatment and stabilization treatment.
The international standard status code of wrought aluminum alloy can also be replaced with the status code of the Aluminum Association (AA).