Steel grade 41CR4+QT

41Cr4 steel is an alloyed steel, containing 0.3 to 0.5% carbon and alloying elements such as chromium, silicon, manganese, nickel or molybdenum, the sum of which does not exceed 5%. It is characterized by machinability and good hardenability, but is not easily welded. The chromium content has a favorable effect on the hardenability of the steel, increases its strength and contributes to grain fineness, in addition to improving corrosion resistance. The proportion of manganese has a favorable effect on wear resistance.

41Cr4 steel is also amenable to forging and rolling. In order to obtain good mechanical properties, it requires appropriate heat treatment, including hardening and tempering. As a result, the finished product is characterized by high surface hardness and adequate core strength.

Thanks to the steel's resistance to impact and abrasion, it extends the service life of products made from it and reduces the cost of use. Due to its high strength, it is very often used in the manufacture of machine components, vehicles and buildings.

41Cr4 steel with the additional designation +QT specifies products delivered after heat treatment, i.e. after thermal improvement, which is a combination of two operations: quenching and high or medium tempering. Heat upgrading of 41Cr4 steel makes it possible to obtain a higher tensile strength value and increase the steel's ductile properties, such as impact strength, constriction and elongation to break. The treatment also provides increased fracture toughness.

41Cr4+QT steel chemical composition

41Cr4+QT steel mechanical properties

41Cr4+QT steel application

41Cr4+QT steel is particularly used in the engineering, automotive and construction industries. It is used for components that require high strength and wear resistance. These are most often:

• crankshafts, camshafts, axles, gears, levers, piston rods, fasteners, abrasive discs, power transmission components, steering components, tool body components and tool holders.