What effect does cobalt have on the performance of steel
Oct. 19, 2020
What effect does cobalt have on the performance of steel
Cobalt is mostly used in special steels and alloys. Cobalt-containing high-speed steel has high high temperature hardness. It can be added to maraging steel at the same time as molybdenum to obtain ultra-high hardness and good comprehensive mechanical properties. In addition, cobalt is also an important alloying element in hot-strength steel and magnetic materials.
Cobalt reduces the hardenability of steel, therefore, adding it to carbon steel alone will reduce the overall mechanical properties after quenching and tempering. Cobalt can strengthen ferrite. When added to carbon steel, it can increase the hardness, yield point and tensile strength of the steel in annealed or normalized state. It has an adverse effect on elongation and reduction of area, and impact toughness also varies with As the cobalt content increases, it decreases. Because of its oxidation resistance, cobalt is used in heat-resistant steel and heat-resistant alloys. The cobalt-based alloy gas turbine shows its unique role.
