Other parts of the hardened set such as SELinux and userspace hardening remain. This is due to the balance between work hardening and annealing (thermal softening). This causes a hardening of the metal as deformation progresses. A particularly damaging element in steels that can lead to hardening or embrittlement is copper. Atherosclerosis is a disease marked by the hardening of arteries. It was also capable of spray coating hardening metals onto other metals. The study showed that tannins suppressed production of the peptide responsible for hardening arteries. Cold forging typically results in work hardening of the piece. Freezing tolerance is enhanced by cold hardening. A widely used process for the surface hardening of steel. There are different kinds of heat treatment processes such as edge hardening or complete hardening. The process of hardening is called sclerotisation. The strength is achieved by age hardening. At the very least, they cause internal work hardening and other microscopic imperfections.