The state of the aluminum plate H state is a common state, which means that the aluminum plate has been subjected to work hardening treatment to improve the strength. In the five basic states of the aluminum plate (F, O, H, W, T), the H state is a state in which we often come into contact with and have a large number of subdivisions. The aluminum plate of the same specification and the same grade has different subdivision states. Performance will vary greatly.
H state representation
H is followed by 2-3 digits, indicating the subdivision state of the H state, and the state of the 2 digits is the most common.
The first digit indicates the processing status of the aluminum plate:
H1: Work hardened state, indicating that the aluminum plate has not been heat treated, and the required strength is obtained only by work hardening.
H2: Work hardening and incomplete annealing state, indicating that the aluminum sheet has been work hardened and the strength exceeds the specified requirements. After incomplete annealing, the strength of the aluminum sheet is reduced to the standard strength.
H3: Work hardening and stabilization treatment state, indicating that the aluminum plate is subjected to heat treatment during heat treatment or processing, and the mechanical properties are stable. H3 is only suitable for aluminum sheets that are naturally aged at room temperature.
H4: Work hardening and painting treatment state, indicating that the aluminum plate is subjected to painting treatment after the work hardening, resulting in an incompletely annealed aluminum plate.
The second digit indicates the strength of the aluminum sheet and the degree of work hardening:
Generally, the degree of hardening is divided into 8 grades, 1 low, 8 high, and 9 represents a superhard state which is higher than Hx8 work hardening.
The H18 state indicates that the aluminum plate has only been subjected to work hardening without being heat-treated, and the strength is such that the aluminum plate has a large strength.
The H24 state indicates that the aluminum plate undergoes incomplete annealing after work hardening and the strength is moderate.
The H32 state indicates that the aluminum sheet is subjected to low-temperature annealing after work hardening, and the state is stable, but the strength is lower than that of the aluminum plate of H24.
The meaning of the three-digit status:
H111 state: It is suitable for products that have undergone appropriate amount of work hardening after final annealing, but the degree of work hardening is not as good as H11.
H112 state: Suitable for hot-rolled sheet free-formed, hot-formed products.
H116 state: Applicable to products made of 5-series alloy with magnesium content ≥4.0%. These products have specified mechanical properties and resistance to flaking corrosion.