1.7225 QT (42CrMo4) is a quenched and tempered variation of 1.7225 (42CrMo4) steel. It is a low-alloy steel that contains chromium and molybdenum as its main alloying elements, which contribute to its high strength, toughness, and wear resistance.
The quenching and tempering process involves heating the steel to a high temperature and then rapidly cooling it in a liquid, such as oil or water, to achieve a hardened structure. The steel is then tempered at a lower temperature to improve its ductility and toughness, while still retaining its high strength.
1.7225 QT (42CrMo4) is commonly used in applications that require high strength and good wear resistance, such as heavy-duty machinery parts, crankshafts, and gears. It is also used in applications that require good toughness and ductility, such as shafts and axles.