45 steel hardness

One method is quenching, which simply increases the hardness, but the toughness is poor and easy to fracture; the second is annealing after quenching to increase the hardness without reducing the toughness; the third is carburizing or nitriding or carbonitriding to increase the surface hardness without the internal change .
No. 45 steel is qualified if the hardness is greater than HRC55 (up to HRC62) before being tempered after quenching. To
The highest hardness in practical application is HRC55 (high-frequency quenching HRC58).
The GB/T699-1999 standard stipulates that the tensile strength of 45 steel is 600MPa, the yield strength is 355MPa, the elongation is 16%, the reduction of area is 40%, and the impact energy is 39J.
Hardness: unheated ≤229HB; annealed steel ≤197HB, the surface hardness after quenching can reach 45~52HRC.

Link to this article:45 steel hardness

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:Alloy Wiki,thanks

Author: 122 122