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White Aluminum Oxide 180 Grit

When some w(Si)<0.5%, too low silicon content will cause insufficient deoxidation of high manganese steel and reduce metallurgical quality(white aluminum oxide 180 grit). Therefore, under higher impact abrasive wear conditions, it is appropriate to control w(Si) in high manganese steel at 0.4% to 0.65%(alumina grit). In summary, w(Si) in high manganese steel should be controlled at about 0.5%.


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Of course, under low impact abrasive wear conditions, the carbonization of high manganese steel The number of objects is not necessarily too restrictive(white aluminum oxide 180 grit). Because high manganese steel contains a large amount of manganese, and the affinity between manganese and sulfur is greater than that of iron(120 grit aluminum oxide), it can capture the sulfur in iron sulfide and form manganese sulfide (MNS) insoluble in liquid steel (melting point 1785 ℃).


When UW (SI) > 0.5%(garnet blasting media), due to the solid solution of silicon in austenite, the atomic radius of lattice type (cubic crystal type) is much smaller than that of Y phase, which promotes the obvious distortion surface of austenite character to play the role of solid solution strengthening and reduce the toughness(white aluminum oxide 180 grit). The solubility of phosphorus in austenite is very small and it is easy to segregate to form phosphorus eutectic.


Excessive precipitation(aluminum oxide blast media canada), so the carbide can be solid-dissolved based on the normal solution treatment process of w(Si) at about 0.5%, which not only ensures the deoxidation of high manganese steel, but also helps improve the wear resistance under low stress(white aluminum oxide 180 grit). Generally speaking(150 grit aluminum oxide), for small and medium-sized parts that work under low stress, especially thin-walled parts, the silicon content can be on the upper limit.


In conclusion(black silicon carbide), to reduce the phosphorus content in high manganese steel, we should first start with raw materials, then improve the smelting conditions, grasp the smelting process, and determine the phosphorus content according to the purpose, importance and structural characteristics of castings(alumina abrasive), which is of great significance to improve the comprehensive mechanical properties(white aluminum oxide 180 grit). 


Practice has proved that when the silicon content in steel is higher than 0.65%, the cracking tendency of steel increases(100 grit aluminum oxide blast media). When w(Si)>0.5%, especially when it reaches 0.8%, carbides will precipitate out in large quantities and become massive, which will prolong the heat treatment time or be forced to increase the heat treatment temperature, resulting in coarse grains and reduced toughness(white aluminum oxide 180 grit). 


For mine wear parts(white aluminum oxide blast media), the relationship between carbon and phosphorus can be expressed as, for example, if the w(P) in steel is 0.1%, the maximum content of carbon is 1.0%(white aluminum oxide 180 grit). Because of the fast cooling during casting, the precipitation of carbides is limited, and it will not cause coarse or coarse carbides like thick-walled large parts(silicon carbide powder). Phosphorus is a harmful element in high-manganese steel. 


Although the oxidation method is used in the electric arc furnace to make steel(glass bead abrasive), the w(P) in the scrap can be reduced to 0.02%~0.03%, but because the reduction period requires the addition of ferromanganese, plus the residual phosphorus in the scrap, then The actual w(P) in steel is more than 0.1%(white aluminum oxide 180 grit). If the content of carbon and phosphorus exceeds the limit of the relationship, the casting will be Cracks appear.


Because the phosphorus eutectic has a very low melting point, it is distributed between the dendrites and on the primary grain boundaries during the solidification and cooling shrinkage of the product(white aluminum oxide 180 grit). It is more difficult to reduce the phosphorus content in high-manganese steel(aluminium oxide suppliers south africa), because the phosphorus content of ferromanganese used for smelting is relatively high, xw(P) can reach 0.3% to 0.4%, or even higher.


Some important parts even require w (P) ≤ 0.04%(black corundum). From the figure, the difference in phosphorus content has a greater impact on impact toughness, and as the temperature decreases, the difference gradually increases. Silicon also promotes the increase of carbides in the as-cast structure(80 grit aluminum oxide blasting media), which makes the performance of steel worse at high temperatures and brittle at low temperatures(white aluminum oxide 180 grit). 


Using the injection smelting method can also promote the deoxidation and desulfurization reactions in the molten steel and reduce the amount of gas in the molten steel, thereby increasing the density of the metal(white aluminum oxide 180 grit). When w (SI) < 0.5%, the toughness increases with the increase of silicon content, which is due to the deoxidation of silicon in high manganese steel and the improvement of metallurgical quality(refractory materials).


The table reflects the effects of phosphorus content and temperature on impact toughness(aluminum oxide suppliers usa). The phosphorus eutectic can be melted only under the temperature conditions of heat treatment(white aluminum oxide 180 grit). As a result, cracks are generated between the product boundary and the dendrites(corundum sand). Phosphorus can be dissolved in the austenite lattice to increase the brittleness of austenite, and phosphorus eutectic is also a brittle structure.


The influence of phosphorus content on casting crack scrap rate is shown in the table(steel shot abrasive). In steel smelting, reducing phosphorus content should improve the quality of raw materials(silicon carbide grit suppliers). For example, the production of high manganese steel parts with low phosphorus ferromanganese can reduce cracks by 2 ~ 3 times(white aluminum oxide 180 grit). Most of the generated manganese sulfide enters the slag and is removed as a non-metallic inclusion.


The melting point of binary phosphorus eutectic (Fe + FAP) is 1005 ℃, and the melting point of ternary phosphorus eutectic (Fe + feac + FAP) is only 950 ℃(brown aluminum oxide). It is very easy to produce thermal embrittlement(white aluminum oxide 180 grit). Sulfur in high manganese steel can be dissolved in liquid steel, most of which exists in the form of iron sulfide (FES)(brown fused alumina grit). The w (P) of low phosphorus ferromanganese produced in China is between 0.15% ~ 0.2%.


Aluminum in high manganese steel is added in the form of deoxidizer(aluminium oxide grit suppliers). Therefore, the sulfur content in the steel is very low, and most of the residual sulfur exists in the form of spherical manganese sulfide inclusion, which has little impact on the properties of the steel(black aluminium oxide grains). When this kind of ferromanganese is used to smelt ZGMn13, it can ensure that w (P) is less than 0.07%(white aluminum oxide 180 grit). Therefore, it is prone to cracks under stress. 


In practical application, the brittle phosphorus eutectic zone in the workpiece will produce microcracks under repeated load, which will eventually lead to workpiece fracture(aluminium oxide sandblasting). Therefore, various standards at home and abroad stipulate that w (s) < 0.05%, but in actual production, it can be controlled at w (s) < 0.02%, and even reach w (s) < 0.005%(white aluminum oxide 180 grit). Secondly, aluminum has strong deoxidation ability.


The deoxidation product is alumina (Al2O3), which is insoluble in liquid steel and its melting point is 2050 ℃(aluminium oxide blasting media). With the increase of carbon content, some carbides are not dissolved after solution treatment and dispersed in austenite. The existence of high hard carbide points increases the wear resistance(white aluminum oxide 180 grit). The relationship between wear loss and carbon content of high manganese steel is shown in the figure. 


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