Railway Fastener Composite Brake Shoe
Our cast iron brake block enjoys many advantages including
hardness, impact strength and so on. It
consists of two parts, the cast iron and the steel support. Both
the surface and core of the cast iron have
the hardness within the range of 197< HB< 255.
When facing subsequent impacts to the brake block or brake shoe,
the steel support must remain intact
and attached to the iron places. The connection bridge may possibly
become detached but should not
show any soundness defects. Separated from the brake shoe, the
support must be able to withstand the
bend test with cracking or breaking.
Chemical compositions of cast iron
Chemical compositions of steel support
C % < 0.13%,
S % < 0.062%,
P % < 0.062%.
composite brake block
Our composite brake block is an ideal replacement of the metallic
(gray cast iron) brake block. Composite
brake block features motion to the wheel and well fitness between
the brake block and brake block shoe
Physical and mechanical properties of composite
1,7 – 2,4
Coefficient of Friction
0,14 – 0,22
70 – 105
2400 – 4000
480 – 1500
1500 - 3500
Heat Resistance: 250ºC
Result: Does not melt and burn for continuous use.
Result: May burn but does not cause the flame.
Our composite brake block won't melt or burn and continues to work
at a temperature of 250℃
It may burn but causes no flame at a temperature of ≥ 400℃.
A. The materials of composite brake block consist of 3 main
substances including reinforcing fiber,
organic/inorganic filler and resin bound.
B. It has a high level of uniformity.
C. It can be separated from the backing plate.
D. It contains no asbestos, lead, zinc or other mixtures.
E. It also contains no toxic materials.
F. The hardness of the material is lower than the wheel's.
G. It causes no strong smell in friction.
Backing plate for a trains' composite brake block must meet the
following criteria. Firstly, it is made of
ST-41 steel plate, and is constructed to transmit the braking force
to the composite material. Secondly,
there should be a binding structure between the composite material
and backing plate, thus forming
into a integrated unit and ensuring sufficient bending strength and
A. Excessive wear won't be caused on the surface of the wheel and
the composite brake block.
B. The composite brake block will not cause the wheel porous or
C. It won't stick at the wheel during braking therefore won't cause
uneven wheel surface.
D. It won't cause wheel slipping during full braking in wet
A. Vernier caliper or other methods are used to test the dimension
of the brake block.
B. Laboratory test
Specific gravity test: standard ASTM D 792 or equivalent method
Coefficient of friction test: Standard ASTM D 1894 or equivalent
Hardness test: standard ASTM D 785 or equivalent method
Shear resistance test: standard ASTM D 732 or equivalent method
Press test: Standard ASTM D 695 or equivalent method
Bending test: Standard ASTM D 790 or equivalent method
Thermal properties test: standard ASTM D 177 or equivalent method