This article is a compilation of binary alloy phase diagrams for which manganese (Mn) is the first named element in the binary pair. The diagrams are presented with element compositions in weight percent. The atomic percent compositions are given in a secondary scale. For each binary system, a table of crystallographic data is provided that includes the composition, Pearson symbol, space group, and prototype for each phase.

This article discusses the composition, processing, and properties of austenitic manganese steel. Austenitic manganese steel is used in equipment for handling and processing earthen materials, such as rock crushers, grinding mills, dredge buckets, power shovel buckets and teeth, and pumps for handling gravel and rocks. The mechanical properties of austenitic manganese steel vary with both carbon and manganese content. Austenitic manganese steels are most commonly produced in electric arc furnaces using a basic melting practice. Heat treatment strengthens austenitic manganese steel so that it can be used safely and reliably in a wide variety of engineering applications. The approximate ranges of tensile properties produced in constructional alloy steels by heat treatment are developed in austenitic manganese steels by deformation-induced work hardening. Compared to most other abrasion-resistant ferrous alloys, manganese steels are superior in toughness and moderate in cost. Manganese steel is not corrosion resistant; it rusts readily. Many of the common applications of austenitic manganese steel involve welding, either for fabrication or for repair.

This article focuses on the specimen preparation procedures of austenitic manganese steels: sectioning, mounting, and grinding. It provides information on macroexamination and microexamination of a fracture surface, the microstructure and special features of austenitic manganese steels, and the alloying elements used.

Hadfield's austenitic manganese steel exhibits high toughness and ductility with high work-hardening capacity and, usually, good wear resistance. Beginning with an overview of the as-cast properties and composition of these class of steels, this article discusses the heat treatment methods used to improve their wear resistance, and the changes in the mechanical properties after heat treatment. Manganese steels are unequaled in their ability to work harden, exceeding even the metastable austenitic stainless steels in this feature.