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SB-SIG Sintered iron parts with graphites (oil-impregnated)
Sintered Iron-Graphite
Bearings (oil-impregnated)
Material List

 SB-SIG | sintered Iron and Graphites / MoS2 bearings (oil-impregnated) 

SINOBRONZE Sintered Fe-C selflubricating bearings is made by the way of compacting sintering,
composed by the basic materials of Iron powder and Graphite.


Iron Materials

 Basic Materials

 Chemical  Composition (%)

 Other Materials 

 SAE863 Type3
 SATM B439-70 GR4
 Mil-B-5687C TypeⅡCompB

  Cu: 18.0~22.0,
  Fe: Rest
  Particles: 2.0

  MPIF: F - 0000 - K23 / ASTM: B 439 - 83 / DIN: SINT - B00
  MPIF: F - 0008 - K32 / ASTM: B 439 - 83 / DIN: SINT - B11
  MPIF: FG - 0303 - K16
  MPIF: F - 0000 - K15 / K23
  MPIF: F - 0005-K20 / F - 0005-K28
  MPIF: F - 0008 - K20 /F - 0008 - K32

 Bronze Alloy List 

Typical Applications

Diesel blinds bushings, Agricultural Machinery combine harvester, tractors , Sewing Machine , Coal Coal Conveyor , Tape Recorder,
Movie Projector, Automotive front suspension rods and other components, Horizontal Conveyor rolling mill, plate mill finishing sector,
oil resistant rubber, reaming mill for the electric trains drive braking, saw frame joints , and other applications.

SB-SIG Bearing Features

The main factors affecting their physical mechanical properties and friction performance are the graphite content, porosity and material's microstructure.

1) Graphite Content
Mixing the graphite powder and iron powder, when compacting it to different shape, the graphite have the effect of lubricating in favor of compact
density distribution. After adding the graphite into the iron materials, it can reduce friction and wear, increasing the allowed sliding 
speed and load,
and the products tensile strength enhancing acording to the graphite content increased. With 3% graphite content, the 
Sintered Fe-C
elf-lubricating bearings with the best friction performance.

2) Porosity
The porosity is another important feature for Sintered Fe-C selflubricating bearings. It have great affection for the materials friction performance
of Sintered Fe-C 
selflubricating bearings. It is exactly with the same relationship between the binding of the limit load and porosity, and the
concerning between the friction/wear and the material' s porosity of Sintered Fe-C 
selflubricating bearings.
A large number of small gaps in the materials structure not only ensure to form oil fim at the bearing work surface, also guarantee the normal
work in the condition of additional oilless from outside under a cetain time and some conditions.

3) Structure
The mechanical properties and friction performance of Sintered Fe-C selflubricating bearings mainly depends on the the materials structure.
Materials carbon content determines its structure is pearlite, pearlite ferrite 
or pearlite cementite. In the materials of Sintered Fe-C 
self-lubricating bearings, the pearlite content significantly affect the properties of their friction:

  • With 60~70% pearlite content, sliding speed with the least affection to the friction coefficient;
  • Pearlite content less than 60%, friction coefficient increasing with sliding velocity increased accordingly;
  • Pearlite content more than 70%, friction coefficient reducing with sliding velocity increased accordingly.
  • Sintered Fe-C selflubricating bearing materials with 0.8~1% graphite content, it will be the most stable for the physical mechanical 
    properties, processing performance and structure.

SB-SIG Bearing Advantages

1. Dry working condition, provides maintenance free operation
2. High thermal stability
3. Can be applied in widely temperatue
4. With lower wear rate and long life service
5. Metal based materials is electrically conductive and shows no electrostatic effects
6. High static load and dynamic load capacity

Sinobronze's Powder Matallury Process

Other Standard Sintered Parts with Oil-impregnated




Sintered Iron bearings with graphite / MoS2

Sintered Iron spherical bearing
iron powder + Graphite / MoS
  Sintered bronze cylindrical bushing
SAE841 / ASTM B438 / SINT A50
  Sintered bronze cylindrical bearing
bronze powder + Graphite / MoS2
  Sintered bronze spherical bushing
SAE841 / ASTM B438 / SINT A50