The H temper is a common state of the finished aluminum sheet, which means that the aluminum sheet has been subjected to work hardening treatment to improve the strength. In the five basic states of aluminum plates (F, O, H, W, T), the H state is one of the most frequently contacted and subdivided temper. The aluminum plate with the same specifications and the same grade has different subdivision temper. The performance will vary greatly.
H temper representation
H is followed by 2-3 digits, indicating the subdivision temper of the H temper, and the temper 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 temper, 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: The temper of work hardening and stabilization treatment indicates that the aluminum plate is subjected to heat treatment during heat treatment or processing, and the mechanical properties are stabilized. H3 is only suitable for aluminum sheets that are naturally aged at room temperature.
H4: Work hardening and painting treatment temper, indicating that the aluminum plate is subjected to painting treatment after 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 is the lowest, 8 is the highest, and 9 is the superhard temper which is higher than the Hx8 work hardening degree.
The H18 temper indicates that the aluminum plate is only subjected to work hardening and is an aluminum plate which has been subjected to heat treatment and has the highest strength.
The H24 temper indicates that the aluminum sheet has undergone incomplete annealing after work hardening and the strength is moderate.
The H32 temper indicates that the aluminum plate is subjected to low-temperature annealing after work hardening, and the temper is stable, but the strength is lower than that of the aluminum plate of H24.
The meaning of the three-digit temper:
H111 temper: Applicable to 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 temper: Suitable for hot-rolled sheet free-formed, hot-formed products.
H116 temper: Applicable to products made of 5 series alloys with magnesium content ≥ 4.0%. These products have specified mechanical properties and resistance to flaking corrosion.