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OilLess Bushes, Bush Bearings & Wear Plates

The Self-Lubricating OilLess Bushes are Graphite Embedded type bushes, Equi-sized and Equi-spaced holes are drilled all over the walls to cover approximately 25% of the total surface area, and are then plugged with graphite rods acting as solid lubricant which is constantly available for lubrication during the life time of the Bush. These are broadly categorised into three groups as per their Base Material namely

  1. OilLess Grade ZA#500 [Copper Based Alloy as Base Material]

  2. OilLess Grade ZA#1000 [ZA-27 as Base Base Material].

  3. OilLess Grade ZA#2000 [Steel Based Alloy as Base Material]

OilLess Bushes, Bush Bearings & Wear Plates

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 value N/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%

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"ZORAVER ESTATE", Survey No. 46, Between Waghodia & Dabhoi X-ing’s,On N.H. No. 8 (Bye-Pass),
Khatamba,  P.O. Ankhol,B A R O D A - 390 019, INDIA. Tel.: +91 - 265 - 5545341.Fax: +91 - 265 - 2561782.

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