QTteräkset

QTteräkset is a term used to describe steels that have undergone quenched and tempered heat treatment. The designation reflects a production route rather than a single alloy; base steels can be carbon or alloyed steels that are treated to achieve high strength with controlled toughness. The process typically involves heating the steel into the austenite range, quenching rapidly to form martensite, and then tempering at a lower temperature to adjust hardness and relieve internal stresses.

The resulting microstructure is tempered martensite, which provides a combination of high tensile strength, good wear resistance, and improved fatigue performance compared with untreated steels. The exact properties depend on the base alloy and the tempering temperature, allowing QTteräkset to be tailored for various service conditions. Common applications include cutting tools, gears, shafts, dies, and other components subjected to high loads and wear.

Standards and grading for QTteräkset are not universal; they are usually defined by the base alloy composition and a specified hardness or tensile strength range rather than by a single global QT standard. Specialty QT steels may incorporate alloying elements such as chromium, vanadium, or molybdenum to improve wear resistance or high-temperature performance. Quality control focuses on achieving the desired hardness, toughness, and distortion limits, while managing residual stresses from quenching.

In summary, QTteräkset denote quenched-and-tempered steels chosen for strength and toughness, with properties tuned through alloy content and tempering.