Only work hardened products without elevated temperature treatment. The H1 is followed by digits, which show the degree of work hardening.
H2
Work hardened and partially annealed
Work hardened products are subsequently partially annealed associated with reduction of strength. The H2 is followed by digits, which show the residual work hardening after partial annealing.
H3
Work hardened and stabilized
The properties of work hardened products are stabilized either by low temperature treatment or by the heat introduced by fabrication. The stabilization of properties is crucial to restrict the age softening of these products. The H3 is followed by digits, which show the remaining work hardening after stabilization.
