H tempering state of aluminum alloys is to add two or three digits after the letter H to indicate the subdivision of the H state. If there are two digits after
H , the first digit indicates the basic processing procedure to obtain the state. For example, H1 represents the pure work hardening state, which is suitable for the state in which the required strength is obtained only by work hardening without additional heat treatment.
H2 tempering state indicates the state of work hardening and incomplete annealing. It is suitable for aluminum alloys that have undergone incomplete annealing to reduce their strength to the specified index after the degree of work hardening exceeds the specified requirements of the finished product.
H3 tempering state refers to the state of work hardening and stabilization treatment, which is applicable to aluminum alloys whose mechanical properties have reached stability after work hardening, low temperature heat treatment or due to heat in the process. H3 state is only applicable to aluminum alloys that gradually fail and soften at room temperature.
H4 tempering state refers to the state of work hardening and initial treatment. It is suitable for aluminum alloys that are not completely annealed after work hardening and initial treatment.
The second digit after H indicates the degree of work hardening of the aluminum alloy product, and the digit 8 indicates the hard state.
The H111 tempering state with three numbers after
the H is suitable for aluminum alloys that have undergone a moderate amount of work hardening after the final annealing, but the degree of processing is not as good as that of the H11 state.
H112 tempering state is suitable for aluminum alloys that are processed and formed. The mechanical properties of aluminum alloys in this state have specified requirements. H116 is suitable for aluminum alloys made of 5 series aluminum alloys with a magnesium content of not less than 4%. These aluminum alloys have specified mechanical properties and anti-exfoliation corrosion performance requirements.
