To heat metal in order to lower its hardness. The term anneal refers to the heat treatment given to 300 series stainless and most 400 series stainless by the steel mill after the raw material has been completed, but before fittings are manufactured. Anneal also refers to the heat treatment given 400 series stainless fittings after their manufacture (also called hardening and tempering) to lower hardness and increase toughness. For example, fittings of 410 stainless may score over 200,000 psi after manufacture and be too brittle. By annealing at 1000 degrees F., tensile strength would reduce to 125,000-150,000 psi, while annealing the same material to 500 degrees F. would bring tensile to 160,000-190,000 psi.
Stands for American National Standards Institute.
Stands for American Society of Mechanical Engineers.
Stands for American Society of Testing and Materials.