Introduction to 45 Steel

No.45
steel is a high quality carbon structural steel
with carbon content of
0.45%. It is widely used in machine
parts manufacturing industry
Because its hardness is not high and easy to cut
so 45 steel after appropriate heat treatment
can obtain a certain toughness
plasticity and wear resistance
For example: No. 45
steel after tempering
has good comprehensive mechanical properties
so it is often used in the manufacture of important
structural parts
especially some gears
bolts
connecting rods working under alternating loads
But because its surface hardness is low
it is not wear-resistant
so we will use surface quenching
to improve the surface hardness
after tempering
The question is
have you ever used 45 steel in your life?