korkeahiilisiin

Korkeahiilisiin is a Finnish term that serves as an adjective describing materials with a relatively high carbon content, most often used in metallurgical contexts. In Finnish, the related noun phrase korkeahiilinen teräs means high‑carbon steel, and korkeahiilisiin appears in various grammatical forms when describing plural nouns in different cases.

Definition and composition

High‑carbon materials typically contain a higher proportion of carbon than mild or medium‑carbon steels. For steels, the carbon content generally ranges from about 0.6% to around 1.0% by mass, with some grades exceeding this range for specialized applications. The higher carbon content is the primary factor behind increased hardness and wear resistance, but it also reduces ductility and weldability compared with lower‑carbon steels.

Properties and heat treatment

Korkeahiilisiin materials are known for their hardness and ability to maintain a sharp edge, making them suitable for cutting tools, blades, springs, and certain wear‑resistant components. To achieve optimized properties, high‑carbon steels are typically heat treated, involving processes such as quenching to harden the steel followed by tempering to adjust toughness and reduce brittleness.

Applications and considerations

Common uses include cutting tools, blades, saws, and precision springs. While they offer excellent edge retention and strength, their brittleness and welding challenges require careful handling in design, fabrication, and joining. Selection often involves balancing hardness and toughness for the intended service conditions.

See also

High‑carbon steel, carbon steel, heat treatment, tool steel.