Product Description and Process
crusher manganese steels castings cast steel products company
Production process: green sand molding, pre-coated sand molding, lost wax investment casting process
Surface treatment process: paint coating
Product Material and Uses
Normally produce with ASTM A128/A128M, ZGMn13-1, ZGMn13-2, ZGMn13-3, ZGMn13-4, ZGMn13-5, ZGMn13Cr2, etc.
The wear resistant steel casting products are widely used for quarrying, excavating, coal industry, cast industry, steel industry, etc.
Austenitic manganese steel
Austenitic manganese steel is a very tough and ductile material having a high impact toughness. Mn-steel is rather soft material having an initial hardness of approx. 220-250 HV. The wear resistance of manganese steel is based on a work hardening phenomenon. When the surface of Mn-steel is under heavy impact or a compressive load, it hardens from the surface while the base material remains tough. The depth and hardness of work hardened surface vary depending on application and Mn-steel grade.
The work hardened layer can be between 10 and 15 mm deep and hardness can be up to 600 HV in primary applications. In fine crushing applications the work hardened layer is thinner and hardness is usually around 350-500 HV. The Mn/C ratio and amount of Cr is not only relevant when it comes to the wear resistance of Mn-steel. The entire casting process needs to be well optimized to produce high quality wear parts. Below are a few critical steps to producing high quality Mn-steel castings.
It all begins with raw material selection where raw materials are carefully selected for melting in order to get the material analysis inside strict specifications and to reduce the amount of certain impurities. During melting and pouring the temperatures are carefully controlled in order to achieve fine grain structure for the castings. At the same time samples are taken to verify the material analysis and adjust if necessary. Melted metal is then poured into sand molds where the metal slowly solidifies. The molds have carefully designed feeding and gating channels to ensure solid castings. Heat treatment is another critical step to producing ductile high quality castings. Temperature, time and quenching need to be well controlled in order to avoid grain boundary carbide formation. After the heat treatment has been completed, castings are machined according to strict tolerance to ensure a perfect fit to the crusher. Besides the casting, the cavity shape has a significant effect on the performance of the crusher and lifetime of wear parts. Cavity shapes are optimized by using sophisticated simulation tools and continuous testing and follow-up.