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The materials used for crusher wear parts

Zhejiang Shengda Machinery Co.,Ltd | Updated: Apr 11, 2017

MANGANESE STEEL

The wear resistance of manganese steel with austenitic structure is attributable to the phenomenon of work hardening. The impact and pressure load results in a hardening of the austenitic structure on the surface. The initial hardness of manganese steel is approx. 200 HV (20 HRC, hardness test according to Rockwell). The impact strength is approx. 250 J/cm². After the work hardening, the initial hardness can thereby increase to an operational hardness of up to approx. 500 HV (50 HRC). The deeper-set, not yet hardened layers thereby provide for the great toughness of this steel. The depth and hardness of the work-hardened surfaces depend on the application and type of manganese steel. The hardened layer penetrates down to a depth of approx. 10 mm. Manganese steel has a long history. Today, this steel is used mostly for crusher jaws, crushing cones and crushing shells.

MARTENSITIC STEEL

Martensite is a completely carbon-saturated type of iron that is made by quick cooling-off. It is only in the subsequent heat treatment that carbon is removed from the martensite, which improves the strength and wear properties. The hardness of this steel ranges between 44 to 57 HRC and the impact strength between 100 and 300 J/cm².Thus, with regard to hardness and toughness, martensitic steels lie between manganese and chrome steel. They are used if the impact load is too little to harden the manganese steel, and/or good wear resistance is required along with good impact stress resistance.

CHROME STEEL

With chrome steel, the carbon is chemically bonded in the form of chromium carbide. The wear resistance of chrome steel is based on these hard carbides of the hard matrix, whereby the movement is hindered by offsets, which provides for a high degree of strength but at the same time less toughness. To prevent the material from becoming brittle, the blow bars must be heat-treated. It must thereby be observed that the temperature and annealing time parameters are exactly adhered to. Chrome steel typically has a hardness of 60 to 64 HRC and a very low impact strength of 10 J/cm². To prevent breakage of chrome steel blow bars, there may not  be  any unbreakable elements in the feed material.

Zhejiang Shengda machinery co., ltd is a professional manufacture of crusher wear parts.We mainly product jaw crusher wear parts,cone crusher wear parts,impact crusher wear parts and hammer crusher wear parts,if you need the castings above ,please feel free to contact us

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