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Cast Iron Railway Brake Shoe Replacement For Heavy Duty Truck Automobile
Specifications:
cast iron brake block
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
Carbon: 3.0-3.5%
Phosphorus: 1.3-1.5%
Silicon: 1.5-2.0%
Sulphur: 0.1-0.15%
Manganese: 0.5-0.8%
Chemical compositions of steel support
C % < 0.13%,
S % < 0.062%,
P % < 0.062%.
composite brake block
1. Function
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 (brake holder).
2. Physical and mechanical properties of composite
| Characteristic | Unit | Value | Testing Method |
| Specific Gravity | gr/cm3 | 1,7 – 2,4 | ASTM D792 |
| Coefficient of Friction |
| 0,14 – 0,22 | ASTM D1894 |
| Hardness | HRR | 70 – 105 | ASTM D785 |
| Crush Strength | N/cm2 | Minimum 2500 | ASTM D695 |
| Bending Strength | N/cm2 | 2400 – 4000 | ASTM D790 |
| Tensile Strength | N/cm2 | 480 – 1500 | ASTM D3039 |
| Shear Strength | N/cm2 | 1500 - 3500 | ASTM D732 |
| Heat Resistance: 250ºC | |||
3. Operational heat
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.
4. Materials
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.
5. Backing plate
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
Cast Iron Railway Brake Shoe Replacement For Heavy Duty Truck Automobile
