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Aluminium Oxide Abrasive Grit

Ferrograph the optical density of particle deposits at different positions is measured by Ferrograph densitometer (or Ferrograph reader) to obtain the size, size distribution and quantity of wear particles(aluminium oxide abrasive grit). The processed data can provide the wear status of parts. Used for small and medium castings with large batches and simple structure(aluminium oxide sandblasting grit). If necessary, less star blowing oxygen can be used to aid melting. 


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Ferromanganese shall be baked above 750 ℃ before adding liquid steel(100 grit aluminum oxide). Each batch shall be fully stirred, and the next batch shall be added after basic melting. Oxidation refining can be divided into two basic processes(alumina grit); The phosphorus content of molten steel at the end of oxidation shall be less than 0.015%(aluminium oxide abrasive grit). Effect of aluminum content on tensile properties of cast austenitic manganese steel. 


When ferromanganese is added in dilute solution, ferromanganese melts quickly and consumes less power in reduction period, but manganese burning loss is large(alumina sand), manganese oxide content in molten steel is high, and it is difficult to form a good reduction overflow(aluminium oxide abrasive grit). The alloying of molten steel usually adopts two processes: adding ferromanganese under white slag and adding ferromanganese under thin flow.


When ferromanganese is added under white slag, good reducing slag is easy to form and the plasticity of steel is good(aluminum oxide abrasive powder). In order to prevent a large amount of unmelted ferromanganese from accumulating "freezing" in the molten pool, ferromanganese should be added in batches(aluminium oxide abrasive grit). The sea injection temperature is generally between 1390 ~ 1450 ℃. During the melting period, push the material to avoid frame erection. 


The specific steps are as follows(aluminium oxide blast media): when smelting high-quality carbon steel liquid, the furnace lining, batching, charging, melting and oxidation shall be in accordance with the general high-quality carbon steel smelting regulations(aluminum oxide blasting grit). In order to prevent phosphorus reduction in slag, the oxidation flow shall be removed as much as possible after oxidation(aluminium oxide abrasive grit). It is suitable for castings with complex shapes and uneven wall thickness.


The use surface and processing surface of the feed piece should be placed as far as possible on the lower front or underside elevation during dry pouring(aluminium oxide abrasive grit). First, refine the high-quality spray stretching liquid, and then alloyed with ferromanganese(aluminum oxide abrasive media). In order to ensure good dechlorination of molten steel, it is usually required that the total content of iron oxide and manganese oxide in slag shall not exceed 1.5%. 


After the charge is melted and reduced with carbon powder for 5 ~ 8 minutes, remove 50 ~ 70% of the slag, supplement the slag and make new slag(white aluminum oxide 80 grit). In the later stage of reduction, the power supply current shall be reduced to prevent overheating of molten steel, and the tapping temperature shall be 1450 ~ 1480 ℃(aluminium oxide abrasive grit). Therefore, the timely operation in the later stage is the same as the oxidation process. 


The composition is qualified and the temperature is appropriate(glass bead blasting media suppliers). Insert 0.8 ~ 1.2kg aluminum block per ton of molten steel for final deoxidation. After tapping, the molten steel is cooled in the ladle for 5 ~ 15min before pouring(aluminium oxide abrasive grit). Other process operations are basically the same as the smelting requirements of high-quality carbon steel(aluminium oxide blasting). The fluidity is better than that of carbon steel, and the filling capacity is stronger.


When there are scrap of the same type of boiler, the return method can be used for smelting(aluminum oxide grit blasting). The main precautions are as follows: when batching, the scrap of the same type of steel should account for 60 ~ 80% of the charge, and 15 ~ 30% of low phosphorus carbon scrap and 5 ~ 10% of low phosphorus ferromanganese should be added(240 grit aluminum oxide blast media). When charging, carbon steel is installed in the high-temperature fusible zone(aluminium oxide abrasive grit).


Generally, silica sand or limestone raw sand is used to prepare Yongge glass sand or clay dry sand for molding and casting(aluminium oxide abrasive grit). From the end of melting, orange mixing shall be strengthened for the molten steel in the molten pool to avoid overheating of the molten copper in the high-temperature area and unclear furnace charge in the low-temperature area, and the furnace bottom shall be graded with low voltage(46 grit aluminum oxide).


In the later stage of reduction, appropriately reduce the voltage and current to prevent liquid steel from overheating(steel grid). For the large wall pin parts of rotary body with uniform wall thickness used for repeated production, the formed metal mold with sand pushing of 10 ~ 15mm or paint pushing of 2 ~ 3mm is adopted, and the wall thickness is 0.8 ~ 1.2 times of the wall thickness of the corresponding pin parts(aluminium oxide abrasive grit). 


The solidification shrinkage rate is about 6.5%, and the shrinkage cavity tends to be large(aluminium oxide sand). To ensure that the phosphorus content and hammer-to-carbon ratio of molten steel are qualified, the average phosphorus content of ferromanganese is not more than 0.3%, and the manganese-to-carbon ratio is less than 10(aluminium oxide abrasive grit). No risers are provided, but more vent holes should be opened on the opposite or side of the gate(white aluminum oxide 180 grit).


The free linear shrinkage rate is 2.4~3.0%, which is about 1.0~1.5 times that of carbon steel, the coefficient of linear expansion is large (about 1.5~1.9 times that of carbon steel), and the thermal conductivity is poor(aluminium oxide abrasive grit), The thermal stress and shrinkage stress are relatively large, and the feed strength and plasticity are low(garnet sand), so the thermal and cold cracking and deformation tendencies are greater than that of carbon steel. 


is usually used for single-piece small batches and complex structures. Before being out of the pot, the slag is white slag or weak calcium carbide(aluminium oxide abrasive grit). If alloy elements such as chromium, nickel, aluminum, titanium, etc. need to be added to steel, add nickel, aluminum and other alloys in the final stage of melting according to conventional methods(aluminum oxide 80 90 grit). Add chromium and manganese at the same time. Join before tapping.


Therefore, the manganese oxide content in the molten steel is relatively high(aluminium oxide abrasive grit). When silica sand is used for modeling and coating, it is easy to form chemical sticky sand. It is better to use alkaline or neutral coatings (such as magnesia or chromite sand). The drill type is divided into three types: sand type, metal type and sand-hanging metal type, which can be selected according to production conditions(silicon carbide grit). Metal type.


The working wall thickness of the metal mold is 0.6 to 0.8 times the wall thickness of the corresponding casting. Hanging sand metal type(aluminium oxide abrasive grit). The outer process assembly surface should use a negative tolerance, and the inner assembly surface should use a positive deviation(aluminum oxide abrasive blasting grit). In the high-strength steel of the drill town button fan, 0.7~1.0% of the sail is added, and after age hardening, the yield strength is above 700MPa.


The actual linear shrinkage rate of the casting is shown in the figure when using clay to dry the sand mold(green silicon carbide). When using water glass sand, the linear shrinkage rate of the casting should be increased by about 20% compared with the data in the figure(aluminium oxide abrasive grit). The open type is generally used, and care should be taken to avoid local overheating, forming hot spots or hindering the shrinkage of the casting, so as not to cause cracks(corundum sand).


Adopting the principle of simultaneous rounding, it is advisable to use more flat and thin cross-section gates to introduce molten steel evenly, dispersedly and steadily(aluminium oxide abrasive grit). All or too part of the important parts of the pin are in the same semi-mold, parting surface and parting surface Consistent, and as much as possible the same plane(120 grit aluminum oxide). Sales shrinkage rate. Simple thin-walled parts(approximately that of carbon steel).


white aluminium oxide
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