These standards regulates important terminologies and their definitions.
on heat heat treatments including rolling, moulding, or forging.
3. The numbers, terms and their definition are as follows. English terms are given for reference.
Note : Where there are two terms for one item, the first term is given the priority.
|| heat treatment
Various mixture of heating and cooling to give necessary
characteristic to steel.
| heat treatment
|| bright heat treatment
Heat treatment is done in a protective environment to prevent
high-temperature oxidization and de-carburization, as well as
to maintain brightness on surface.
| bright heat treatment
|| Vacuum heat treatment
General term for all heat treatment in vacuum.
|| ion bombardment heat treatment
plasma heat treatment
Surface treatment in a decompressing environment,
where glow discharge is created between anode and
treatment from the electrode.
| ion bombardment
|| electrolytic heat treatment
Heat treatment where treated materials from either electrolyte
or salt bath, and
where electricity is allowed to flow with the
anode are heated followed by cooling.
| electrolytic heat treatment
Treatment to change steel into an austenite composition
by heating over transforming temperature. Also know as
complete austenitizing. Austenitizing within transforming
temperature is known as partial austenitizing.
Treatment to increase hardness by aging, heating and cooling.
Includes aging hardening, extraction hardening, quenching hardening and surface hardening
When particles that are transformed with cold working are
the nucleus of new particle with no internal
transformation are formed and multiplied after the process
of reduction of internal stress.
As the nucleus become greater in size, it is substituted
with theoriginal particle.
The temperature that induces recrystalization is called the
This temperature varies according to the purity of metal or
alloy, transformation of particles, and heating time.
When steel is heated in an environment where it reacts
with carbon, this process will lead to a phenomenon of
The layer that is decarburized is called the decarburized
layer and it is measured in overall decarburized depth,
ferrite decarburized depth,
certain remaining carbon decarburized depth, and
decarburized depth for actual use
|| surface hardening
Treatments to harden steel's surface including carburized
hardening, induction hardening, spark hardening.
| surface hardening
|| induction hardening
Hardening process where hard frequency electricity
It is used to harden unspecified areas of surface.
This treatment is prescribed in KS B4902
(Induction hardening and tempering treatment).
| induction hardening
Treatment to increase carbon in surface of steel by
heating in carburizing agents.
They are divided into hard, liquid and gas carburizing
depending on the agent. It is
usual for carburizied
steel to be used after hardening tempering.
This treatment is also known as case hardening.