Medium manganese steel and preparation method thereof

Abstract

The invention discloses medium manganese steel. The medium manganese steel comprises the following components in percentage by weight: 0.9 to 1.1 percent of carbon (C), 6 to 8 percent of manganese (Mn), 0.3 to 0.6 percent of silicon (Si), 1.0 to 1.2 percent of chromium (Cr), 0.2 to 0.4 percent of percent (MO), less than or equal to 0.04 percent of phosphorus (P), less than or equal to 0.04 percent of sulphur (S), and the balance of Fe. A preparation method comprises the following steps of: selecting raw materials; smelting, and yielding water after ensuring that the components are qualified, wherein the water yielding temperature is controlled at 1,650 DEG C, and casting; molding, coating after molding, assembling molds and casting; removing sand: cleaning cast burrs, and performing polishing inspection; preserving the heat, stacking casts with sand cleaned in a high-temperature heat treatment furnace, sealing a furnace door, raising the temperature, preserving the heat after the temperature is raised to 1,100 DEG C, preserving the heat for 6 hours, quickly discharging the casts, and putting the casts into water for quenching; and cleaning surfaces again, and inspecting, accepting, warehousing, stacking, classifying and warehousing products. The medium manganese steel has the advantages of ensuring high impact resistance and abrasion resistance of manganese steel; having a simple production process, low production cost and a good market prospect.

Description

【Technical field】 [0001] The invention relates to manganese steel and a preparation method thereof, in particular to a medium manganese steel and a preparation method thereof. 【Background technique】 [0002] Manganese steel is a high-strength wear-resistant steel, which is mainly used in harsh working conditions such as impact, extrusion, and material wear. The main form of damage is wear and tear, and some parts are broken and deformed. Wear is divided into three types: friction and wear in which the surfaces of metal components contact each other and move; abrasive wear in which other metal or non-metal materials hit the metal surface, and erosion wear caused by contact between flowing gas or liquid and metal. The wear resistance of wear-resistant steel depends on the material itself, while the wear-resistant steel shows different wear resistance under different working conditions. Only the material itself and the working conditions can determine its wear resistance. Cas...

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Problems solved by technology

[0005] Due to the unsatisfactory impact resistance and wear resistance of existing high manganese steel and alloy steel, it leads to high wear and tear during use. In order to further improve the impact resistance and wear resistance of high manganese steel, new steel suitable for different industrial and mining environments is sought. In recent years, researchers from various countries have made a series of studies on the composition and ratio of alloying elements of high manganese steel.