|
OilLess Bushes, Bush Bearings & Wear
Plates
[Equivalents
to: 500 SP (Japan) and Lubo
500 (US) and their other Grades]
Mechanical /
Physical Properties:
|
Test Item |
Self-Lubricating
OilLess
Grade “ZA#500”
|
Self-Lubricating
OilLess
Grade “ZA#1000”
|
Self-Lubricating
OilLess
Grade
“ZA#2000” |
|
Specific gravity
|
8.2 g/cm2
|
4.9 g/cm2 |
8.9 g/cm2
|
|
Tensile Strength
|
785 N/mm2 [MPa]
/80
Kgf/mm2 |
420-490 N/mm2 [MPa]
/ 47 - 50
Kgf/mm2 |
1400-1490 N/mm2 [MPa]
/ 142 - 152
Kgf/mm2 |
|
Elongation
|
12% |
2- 8% |
8-10% |
|
Compressive Proof Stress
|
390 N/mm2 [MPa]
/40
Kgf/mm2 |
- |
- |
|
Hardness
|
180 – 235 BHN |
90-120 BHN |
400- 500 BHN |
|
Modulus of elasticity
|
110 kN/mm2 [GPa]
/11,224
Kgf/mm2 |
98,000 N/mm2 [MPa]
/10,000
Kgf/mm2 |
205 kN/mm2 [GPa]
/20,900
Kgf/mm2 |
|
Co-efficient of Friction
|
0.04 - 0.1 |
0.04 - 0.1 |
0.04 - 0.1 |
|
Thermal Conductivity
|
- |
126 W/m/ oC at 70-140
oC
|
- |
Material &
Application:
|
|
Grade "ZA#500"
|
Grade "ZA#1000"
|
Grade "ZA#2000"
|
|
Base Material
|
Copper Based Alloy with High
Nickel. |
Zinc Based Alloy with Low Copper.
|
Steel Based Alloy with High
Chrome. |
|
Application temperatures
|
Upto 250 oC
|
Upto 70 oC
|
Upto 400 oC
|
|
Embedability
|
Very Good
|
Very Good
|
Very Good
|
|
Working Conditions
|
Can be used in sea-water
applications. |
Not recommended for water
applications. |
Most suitable for severe mining
operations. |
|
Lubricant
|
Graphite as Non-Liquid Lubricant, Share
20-25%. |
Graphite as Non-Liquid Lubricant, Share
20-25%. |
Graphite as Non-Liquid Lubricant, Share
20-25%. |
Material Data OilLess
Grade "ZA#500":
| Test Item |
OilLess
Grade "ZA#500" |
| Chemical
Composition. |
Cu=55% Min. Al=3.0-7.5, Fe=2.0-4.0, Mn=2.5-5.0, Ni=0.5-1.5,
Bal. =Zn |
| Co-efficient
friction |
0.04 -
0.10 |
| Co-efficient of
thermal expansion |
1.6 -
2.0 x 10-5/ oC |
| Co-efficient of
shrinkage |
1.8 -
2.3% |
| Shear
strength |
560
N/mm2 |
| Yield limit Rp
0.2 |
450
N/mm2 |
| Elongation to
fracture A5 |
8% |
| Stroking
velocity |
15
m/min |
| Alt. Flexural
strength |
±150
N/mm2 |
| % of lubricant
deposits to sliding surface |
25% -
30% |
| Electric
Conductance |
7 - 8
m/(W x
mm2) |
Correlation of Surface pressure, Temperature, Speed and
Lubrication:
OilLess Grade
“# ZA 500”:
|
Surface Pressure Max.
(N/cm2) |
Temp.(oC) |
Speed(m/min) |
PV valueN/cm2 x m/min |
Lubrication |
| 2500 |
300 |
15 |
10,000 |
Initial |
| 5000 |
80 |
15 |
10,000 |
Initial |
| 2500 |
150 |
50 |
15,000 |
Periodic |
| 2500 |
150 |
100 |
20,000 |
Pressure
Lubrication |
Material Data
OilLess Grade
"ZA#1000":
|
Test Item
|
OilLess Bushes
and Bush Bearings
Grade
“ZA#1000” |
|
Chemical Composition. |
Al=25 - 28%, Cu=2 - 2.5%, Fe=0.1%, Impurities=1%, Balance= Zn
[Equivalent to UNS Z35841] |
|
Ultimate Tensile Strength
|
420-490 MPa
|
|
Yield Strength |
378 MPa
|
|
Hardness |
90-120 BHN |
|
Shear strength |
290-305 MPa
|
|
Co-efficient friction |
0.04 – 0.10 |
|
Temperature Conductivity
|
125.5 W/m/ oC at 70-140 oC
|
|
Thermal expansion |
26 mm/mm/°C at 20-100 °C (x10-6)
|
|
Solidification Shrinkage
|
1.26% |
|
Solidification Temp. Range
|
480-580 oC
|
|
Creep Strength MPa. (Stress to produce Creep rate of
0.01%/1000 Hrs. at 25 oC)
|
70 |
|
Creep rate at 138 MPa stress (% 1000 Hrs. at 20
oC) |
0.04 |
|
Elongation to fracture % in 51mm A5
|
2 - 8%
|
|
Fracture Toughness
|
22 MPa. m ½
|
|
%
of lubricant deposits to sliding surface
|
25% - 30%
|
Material Data
OilLess Grade
ZA#2000":
Test Item
|
OilLess Bushes
and Bush Bearings
Grade
“ZA#2000” |
|
Chemical Composition. |
C=0.98-1.1,
Cr=1.45, Mn=0.35, P=0.025 Max., S=0.025 Max., Si=0.23, Bal.=
Fe |
|
Tensile Strength |
1400-1490
MPa |
|
Yield Strength |
1650-1700
MPa |
|
Hardness |
400 – 500
BHN |
|
Modulus of elasticity |
200 -
205 GPa |
|
Co-efficient friction |
0.04 –
0.10 |
|
Thermal Conductivity |
45-48 W/m-K |
|
Co-efficient of thermal expansion linear 250°C
|
11.9 µm/m-°C |
|
Co-efficient of shrinkage
|
1.8 -
2.3% |
|
Shear Modulus strength |
80 GPa |
|
Electrical Resistivity |
0.0000219 ohm-cm |
|
Heat Capacity |
0.475 J/g-°C |
|
%
of lubricant deposits to sliding surface
|
25% -
30% |
|
