Are used to manufacture the parts of friction blocks operating in the conditions of dry, semi-dry and liquid friction upon steady or smoothly changing load (thickening rings, face thickenings, sliding bearings shells for compressors and pumps , etc.). For the parts made of the above said materials it is recommended to use cast iron, steel, chrome dressing as the countershank material; permissible specific pressure is 15-20 kgc/cm2; permissible speed is 20 m/s. Permissible working temperature upon exploitation of products made of the above materials in the oxidizing, reducing and neutral media is 230° C. Amount of wear at permissible specific pressures and speeds in the conditions of dry friction in the air at the indoor temperature for 100 hours of operation is not more than 30 mkm. Graphite-babbit materials are not recommended for the operation with nonferrous metals and their alloys. The advisable surface roughness of the counterpart should be Ra 0.12, State Standart 2789-73. Size of moulds, mm
It is possible upon agreement between a factory-consumer and the factory-manufacturer to supply moulds of other sizes as well as moulds in the way of sockets and rings:
internal diameter, mm 20, 30, 40, 75
external diameter, mm 42, 55, 65, 110.Phisico-mechanical properties
Note. Intensive heat elimination is necessary upon exploitation of the said grades of materials in the mode of dry friction. The friction coefficient of the above materials is within the scope of 0.7 to 0.15 in case of operation in the mode of dry friction.
| Dencity, (g/cm3), min.
| Compressive strength, MPa (kgc/cm3), min.
| Permissible specific load, kgc/cm2, max.
| Permissible working speed, m/s, max.
| Permissible working temperature, ° C, max.