Austenitic Medium Manganese Steel is a new wear-resistant material obtained by reducing the content of manganese and adding a certain content of chromium on the basis of Mnl3, so as to reduce the stability of austenite. Its approximate composition is 8.0% – 9.5% Mn; １．０％-１．２％Ｃ； ２．０％-２．５％Ｃｒ；＜ ０．８％Ｓｉ。 The metallographic structure of medium manganese steel is austenite. However, due to the low stability of austenite, it can work hardening faster when subjected to impact load, and can quickly form a high hardness hardened layer (deformed martensite). Therefore, the ability to resist low stress impact abrasive wear is greatly improved. It can be used in the manufacture of wear-resistant parts such as rolling mortar wall / crushing wall of cone crusher (under non strong impact conditions).
Although the initial hardness of medium manganese steel is low, the modified medium manganese steel can be obtained by alloying and modification. The modified medium manganese steel is a wear-resistant material made by adding composite modifier on the basis of medium manganese steel. Through modification, the grain can be refined and the morphology and distribution of carbide can be changed. When the carbon content is less than 1.2%, the impact toughness and work hardening energy of medium manganese steel can be improved Strength and wear resistance.
The suitable composition of high carbon medium manganese steel is 1.58% – 1.90% C and low manganese content (5.0% – 6.5%) , 1% – 2% Cr, 0.28% – 0.48% Si, wear-resistant materials with high toughness, high hardness and good work hardening ability can be obtained by rare earth modification, incomplete austenitizing quenching and tempering. The impact initial properties of high carbon medium manganese steel can be greatly improved by controlling its tempering temperature. When the tempering temperature reaches At 300 ° C / s, the impact toughness reaches the maximum value, about 121j / cm2. Compared with the conventional water toughened high carbon medium manganese steel, the impact toughness value of the modified high carbon medium manganese steel can be increased by nearly 80%, and its hardness has little change. However, after tempering, the amount of carbides in the structure of the modified high carbon medium manganese steel increases and is dispersed in granular or massive form Compared with non tempered high carbon medium manganese steel, the wear weight is reduced by 56%. This kind of wear-resistant material is suitable for the manufacture of wear-resistant parts under medium impact load.