45 steel quenching the specific steps of what, to high hardness, bending strength, boring machine with a knife
Practical application of the highest hardness of HRC55 (high-frequency hardening HRC58).
1. 45 steel after quenching without tempering, hardness greater than HRC55 (up to HRC62) for qualified.
45 steel for high-quality carbon structural steel, the hardness is not high for cutting, mold commonly used to do 45 steel pipe template, tips, guide pillars, but to heat treatment.
Recommended heat treatment temperature: normalizing 850 ℃, quenching 840 ℃, high temperature tempering 600 ℃, low temperature tempering 200 ℃.
