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What’s
CARBURIZING ?
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- Carburizing
is a remarkable method of enhancing the surface properties
of shafts, gears and other highly stressed machine
parts.
- Low carbon steel
of finished shapes are converted by carburizing into
a composite consisting of a high-carbon steel case
and low carbon steel core.
- When this composite
is quenched to martensite and tempered, the high hardness
and strength of the case microstructure, combined
with the favorable case compressive residual stress
developed by interaction between the case and core
during quenching, produce very high resistance to
wear, bending fatigue, and rolling-contact fatigue.
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| Advantages
durferrit carburizing |
- CEconstant80
is the patent salt by Durferrit(Germany).
- Carbon potential
of salt can be easily controlled, thus carbon concentration
by carburizing can be easily obtained.
- Through carburizing
process, small amount of nitrogen is also induced
with carbon. (Carbo-nitride)
- Carbo-nitriding
be managed by treating temperature.
- Direct quenching
at carburize temperature will minimize distortion.
Economical and quick for even small amount production.
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| Measurement
of
case depth |
- Quality of carburized
part is usually specified by both surface
hardness and case depth.
- Case
depth is
defined as effective case depth
and total case depth.
It shall be clearly specified at order.
- 'Effective
case depth’
is a distance from surface to specified hardness,
if not specified, HRC50 is used.
- ‘Total
case depth’
is a distance from surface to the position where difference
between original matrix cannot be detected by any
of chemical etching or hardness check.
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| Estimation
of CORE
HARDNESS |
The estimation of internal hardness of carburize part is available by using the jominy carve of the material. Select quenching media water or oil, select the portion of hardness required sush surface,
¾
from center or center, and then chose the actual diameter of round bar. The hardness can be estimated
at the crossing point of the ine draw down from a diameter and the jominy carve of the material. The surface hardness means uncarburized surface.
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