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Antifriction bronzes par excellencxe.
The particular casting technique adopted provides castings with a double
eutectoid structure with thin lead spheres distribuited along the whole
matrix.
They have pproven to be ideal as for their creep and water resistance
even at high temperatures with the possibility of self-lubrification
in case of sudden running abnormality: low dry friction coefficient,
low expansion at good thermal conductivity. The plastic of alloys prevents
light misalignements which cannot be avoided in case of couplings on
big dimensions.
Achieved according to the regulations of the table UNI 4855 "Casting
copper alloys as ingots and castings - Generalities and tests"
| Designation |
Composition |
Unitary
ultimate tensile stress
R
[kgf/mm2] |
Elongation
A
[%] |
Brinell hardness
HB
[kgf/mm2] |
Supply |
CM2
CM4
CM4/A
CM7 |
Cu/Sn/Pb/Zn/Ni
Cu/Sn/Pb/Zn/Ni
Cu/Sn/Pb/Zn/Ni
Cu/Sn/Pb/Zn/Ni |
14÷18
16÷20
24÷30
18÷22 |
3÷6
5÷8
10÷18
4÷7 |
50÷65
55÷70
60÷80
65÷85 |
Sand
casting
Continuous casting |
The trademarks of bronzes "CM" "DURAN" "MAC"
assure the unchangingness of mechanical and metallurgical characteristics
in the castings we produce.
CM2
Bushes and bearings (without coatings) for quick turning shafts; bushes
for spindles, motors, crushers, granulators; gas rings for hydraulic
cylinders and metallic gasket.
CM4 - CM4/A
Bushes for mixers, cold rolling mills, fifth wheels, standing presses;
blade-lock for building and mining equipment.
CM7
Bushes and beraings submitted high loads for hot rolling mills; bushes
for calenders up to 200°C; lock of cylinders and rotors for pumps;
gibs and sliding guides; thick bushes for drawing machines.
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