Crusher Wear Parts: Alloys & Properties
The cast spare parts of aggregate processing machinery are worn by impact stresses, friction or by a combination of both. Their lifetime can be increased if the proper material is selected. EGNATIA Foundry having the necessary expertise of steel and iron casting and harmonizing with the international alloy standards (DIN, EN, ASTM etc.) is able to propose and produce cast parts of various qualities with properties suitable for each application.
The quality control for conforming to the specifications is applied by the fully equipped Department of Quality Control before and after casting. The basic categories of alloys which are used for our spare parts are:
Manganese steel has the property οf work hardness. The bigger the stones that are being processed by the crusher and the bigger the impact stresses in the crusher, the harder the cast part becomes. In this way, while the initial hardness is 170-240 HB during operation the hardness reaches 500 HB, provided that the impact stresses are powerful enough (minimum resistance of manganese steel to the impact is 40 Joule). If the impact stresses remain in low levels then the hardness will also remain in low levels having as a result the wear of the cast part due to friction.
White cast-iron is the hardest alloy that can be used in this type of cast spare parts. Its hardness can reach 63 HRC and has the best behavior against wear compared to other alloys. Its use is limited due to small resistance to the impact stresses, and it is recommended in strictly controlled operations (use of screens, metal sensors, magnets) so that the possibility of feeding the crusher with big or metal items will not happen.
This alloy is used in spare parts of crushers that process medium size and very abrassive aggregates. Martensitic steel is harder than manganese steel resulting in more wear-resistant parts. Its impact resistance is higher than white cast iron resulting in better performance when bigger stones are fed in the crusher.