| The electron micrograph photo shows the microstructure
cross-sections of ECO BRASS and C36000 rod. Lead
contained in free cutting brass rod does not form as a
solid solution in the matrix consisting of α-phase and
β-phase, but exists as dispersed particles visible as
white specks in the C36000 image. These dispersed lead
particles act as chip breakers during machine work. The
microstructure of ECO BRASS rod consists of silicon rich
κ-phase (representative composition: Cu8Zn2Si),
γ-phase (representative composition: Cu4ZnSi)
and α-phase. κ-phase and γ-phase which are formed by
the silicon additive, function as the chip breakers.
|
| The chips of ECO BRASS are small and do not twine
around the work or tools, allowing trouble free
machining, even with high-speed automatic operations.
ECO BRASS provides good machinability without lead and
has a smooth surface finish that can not be obtained
with traditional brass, bronze, SUS304, SUS303 or free
cutting steel SUM23L.
|
|
EcoBrass Chips
|
Brass Rod (C3604) Chips
|
 |
 |
|
|
| Excellent
Hot Forgeability |
|
|
|
| The hot compression tests in the photo were made in
our laboratory. ECO BRASS has no cracks at any
temperature and shows greater deformability than C3771.
|
 |
Hot compression testing procedure
|
| The melting temperature of ECO BRASS is 234oF
(130oC) lower than that of C83600 and the fluidity of
ECO BRASS is better than that of C83600. ECO BRASS is also
suitable as a casting alloy.
|
|
Alloy
|
Melting Point (oF)
|
Melting Point (oC)
|
|
EcoBrass
|
1,616
|
|
|
Ｃ3604
|
1,652
|
|
|
CAC406 (BC6)
|
1,850
|
|
|
We evaluated the fluidity of ECO BRASS with a spiral
fluidity tester. Fluidity was evaluated by measuring the
distance the molten metal flows into a spiral metallic
mold. The fluidity of ECO BRASS was found to be better
than that of CAC406. The table and photos show that ECO
BRASS as a molten metal flows better than CAC406 even
if its pouring temperature is 212oF (100oC)
lower than that of CAC406.
|
|
Alloy
|
Temperature oF
|
Distance (inch)
|
Temperature oC
|
Distance (mm)
|
|
EcoBrass
|
2,012
|
12.2
|
1,100
|
310
|
|
2,102
|
14.2
|
1,150
|
360
|
|
CAC406 (BC6C)
|
2,192
|
8.3
|
1,200
|
210
|
|
|
|
EcoBrass
|
CAC406 (BC6C)
|
 |
 |
|
|
