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% |
