45 steel hardness

Common carbon quenched and tempered steel. The steel cold plastic in general, annealing, normalizing slightly better than quenched with high strength and good machinability, after appropriate heat treatment can be obtained by a certain toughness, ductility and wear resistance, material sources convenient. Suitable for TIG welding and hydrogen, is not suitable for welding. Preheating before welding should be carried out to stress annealing after welding.

Can improve the hardness of less than 160HBS normalizing rough cutting. After the steel after quenching, its mechanical properties to be optimized in other carbon structural steel, but the steel hardenability is low, the water critical quenching diameter of 12 ~ 17mm, there is a tendency to crack when water quenching. When the diameter is greater than 80mm, or normalizing after quenching, similar mechanical properties of the medium and small mold parts after quenching and tempering treatment available high strength and toughness, while large parts, then the appropriate normalizing so, this steel is usually used in the quenched and tempered or normalized condition.

Quenched with a hardness range is generally between 225-297HB. 45 # steel is quenched if, that is, quenching and tempering, the highest hardness should 297HB, namely 31 ~ 32HRC it! This is the ideal state. General may also reach this value.

45 steel hardened, quenched with water generally able to achieve if 40 ---- 60HRC (depending on the size and material of the water), oil quenching is generally between 30 ---- 55HRC (based on the size and type of material thickness is different quenching oil ).