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Home Material Sciences Partially Graphitized Iron for Braking Shoes

Partially Graphitized Iron for Braking Shoes


Braking shoes of iron with cementite (5-15%), graphite, pearlite and iron phosphides in structure have a high durability (without of damaging of wheels surface) and with sufficient galvanic effectiveness. Durability of these braking shoes is 1.5…3 times more than braking shoes of cast iron with phosphorus as a main alloying element.

Braking shoes
Braking shoes

Partially graphitizing iron as a material for braking shoes is used at manufacturing of tram and locomotive braking shoes. The quantity of such braking shoes is several million pieces. Durable of braking shoes in maneuvering locomotives increased on 2-3 times, in main line locomotives - on 1.5-2 times.

Dependence of the friction braking shoes on the initial rate of inhibition
Dependence of the friction braking shoes on the initial rate of inhibition:
(a) partially graphitizing iron; (b) alloying cast iron

Braking shoes of partially graphitizing iron can be manufactured without heat treatment (by means of control of chemical composition of iron with silicon, phosphorus, manganese, chromium and carbon) and by means of casting of braking shoes of white (or half) non alloying iron with next heat treatment.

The first variant of technology use at iron melting in electric furnaces, the second - both in electric furnace and in cupolas.

Microstructure of partially graphitizing iron

Iron after heat treatment
Iron after heat treatment

Cast iron
Cast iron

Areas of Application

Foundry industry

Contact Details

Organization: Physico-Technological Institute of Metals and Alloys of NASU.
Address: 34/1 Vernadsky Avenue, 03680, Kiev-142, Ukraine.
Tel. (044) 444-35-15.
Fax (044) 459-50-29.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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