Kylmätyöstetty

Kylmätyöstetty is a Finnish term that translates to "cold-worked" or "cold-formed" in English. It refers to the process of deforming metal or other materials at or near room temperature, below their recrystallization temperature. This contrasts with hot working, which is performed at elevated temperatures.

Cold working techniques include processes such as rolling, drawing, forging, extrusion, and bending. When metal is cold worked, its grains become elongated and distorted, leading to strain hardening. This phenomenon increases the material's yield strength, tensile strength, and hardness, but it also reduces its ductility and toughness. The precise effects depend on the material, the degree of cold working, and the specific process used.

The advantages of cold working include improved surface finish, tighter dimensional tolerances, and enhanced mechanical properties without the need for subsequent heat treatment in many cases. It is commonly employed in the manufacturing of wires, rods, sheets, tubes, and various precision components. However, excessive cold working can make the material brittle, necessitating annealing to restore ductility if further processing is required. The term is widely used in materials science and manufacturing contexts in Finland.