The influence of element content and properties in high manganese steel:
High manganese steel is divided into 5 grades according to national standards, with the main difference being the carbon content, which ranges from 0.75% to 1.45%. High impact and low carbon content. The manganese content should be between 11.0% and 14.0%, generally not less than 13%. There is no national standard for ultra-high manganese steel, but the manganese content should be greater than 18%. The level of silicon content has a significant impact on impact toughness, so the lower limit should be set to no more than 0.5%. Low phosphorus and low sulfur are the most basic requirements. As high manganese content naturally plays a role in desulfurization, reducing phosphorus is the most important, and efforts should be made to keep phosphorus below 0.07%. Chromium improves wear resistance, usually around 2.0%. Therefore, only rapid and accurate measurement of molten steel in front of the furnace can provide necessary basis for casting high manganese steel.
(1) When the carbon content and manganese content in steel are too low, it is not sufficient to produce effective work hardening effect; When the carbon content is too high, a large amount of carbides, especially coarse carbides, will appear in the as cast state. Therefore, in order to avoid the precipitation of carbides, the carbon content must be controlled not to be too high.
In order to ensure the performance of high manganese steel, there must be sufficient manganese content. When the manganese content is too low, a single austenite structure cannot be formed; However, excessive manganese content is also unnecessary. In production, it is generally stipulated that WMn should be controlled between 11.0% and 14.0%, and WC should be controlled between 0.9% and 1.3%. It should be pointed out that there should be an appropriate combination between manganese content and carbon content, that is, there should be a suitable manganese carbon ratio, generally controlled at Mn/C=10.
(2) The specification content of silicon in high manganese steel with silicon content is 0.3% to 0.8%. Silicon will reduce the solubility of carbon in austenite, promote carbide precipitation, and reduce the wear resistance and impact toughness of the steel. Therefore, the silicon content should be controlled at the lower limit of the specification.
(3) The specification content of high manganese steel with phosphorus content is Wp ≤ 0.7%. When melting high manganese steel, due to the high phosphorus content of manganese iron, the phosphorus content in the steel is generally also relatively high. Because phosphorus can reduce the impact toughness of steel and make castings prone to cracking, the phosphorus content of steel should be minimized as much as possible.
(4) The specification requirement for high manganese steel with sulfur content is Ws ≤ 0.05%. Due to its high manganese content, most of the sulfur in the steel combines with manganese during the smelting process to form manganese sulfide (MnS), which enters the slag. Therefore, the sulfur content in the steel is often low (generally not exceeding 0.03%). Therefore, the harmful effects of sulfur in high manganese steel are higher than those of phosphorus.
The metal element analyzers applicable to this method are:
XY-FB microcomputer high-speed analyzer XY-FC microcomputer high-speed analyzer XY-FD computer multi-element analyzer
XY-3A Intelligent Element Analyzer XY-3B Intelligent Element Analyzer XY-1A Intelligent Element Analyzer