Silicon aluminum calcium in Calcium Cored Wire is a kind of alloy cored wire used in the process of refining steel. It has a large affinity for oxygen and sulfur and can be widely used in deoxidization and desulfurization.
It can improve the quality of molten steel, change the shape and nature of inclusions, greatly increase the alloy yield, reduce the cost of steelmaking, shorten smelting time and precisely control the composition.
Compared to the bulk alloy feeding method or alloy powder spraying method, calcium silicon cored wire can put alloy powders into molten steel more efficiently and properly. It avoids reaction with air and slag, increases absorptivity of metallurgy additives, and can make the molten steel temperature rise to a higher level.
Furthermore, it can change the shape of inclusions and improve casting state of molten steel. It is also conducive to adjust and control the content of easily oxidizable elements, and greatly improve molten steel quality, reduce refractory consumption and lower production cost.
Cored wire technology is a new treatment for refining secondary steelmaking. It is used for molten steel deoxidation, desulfurization, and alloy fine-tuning and can change the form of inclusions in the molten steel, and it also can increase the molten steel yield, reduce the smelting cost, and shorten the smelting time. It is an excellent alternative to the conventional jet metallurgy treatment method.
The calcium and silicon in the Silicon Aluminum Alloy have a very strong affinity for oxygen and sulfur. It helps deoxidize and desulfurize liquid steel in converters and ladles. It also liquefies oxide and sulfide inclusions in the steel and improves the fluidity, machinability, ductility, and impact toughness of the resulting cast iron.
It is easy to float out of the molten steel, so it can be used as a substitute for calcium-magnesium alloys. It can also be used to remove nitrogen from the molten steel.
Alloy cored wire is made by pulverizing the alloy powder of steel strip, wrapping it around the steel wire and processing it through a cored wire machine. It can increase the efficiency of refining process and decrease the amount of metallurgy additives needed. It also avoids reaction with air and slag, increases the absorptivity of metallurgy additives, and improves the shape of the inclusion in molten steel. It can also make the smelting and casting quality better.
The core wire is made of silicon calcium block or alloy powder, wrapped around a steel strip. Then it is pressed and stuffed through professional cored wire machine to get the final product. During the production, manufacturers should take care of compaction and prevent leakage of powder to ensure good quality of finished products.
In smelting, the silicon calcium alloy is used as deoxidizer and desulfurizer to improve steel quality. It is also an effective inoculant to promote formation of spheroidal graphite. It can deoxidize and desulfurize molten steel effectively, change the form of inclusions, prevent nozzle clogging, and improve casting process.
Compared with the bulk alloy feeding method and alloy powder spraying method, the cored wire feeding technology is simple in structure, convenient in operation, small in investment cost, low in operating noise, and no smoke. It can precisely adjust the chemical composition of molten steel, and can greatly improve the shape of inclusions.
The core wire made of alloy powder can be fed directly into molten steel to carry out deoxidation, desulfurization and alloy fine-tuning. It avoids the reaction with air and slag, increases absorptivity of metallurgy additives, prevents nozzle clogging and improves casting quality.
Non-metallic inclusions in molten steel can be classified into two types: alumina and silicon based inclusions. Both of them are highly prone to come up and cause a turbidity in the slag pool and liquid steel surface. Using silicon calcium composite deoxidizer can make these non-metallic inclusions change their form into calcium aluminate inclusions, reducing the turbidity of the slag pool and liquid steel surface, improving casting quality.
The invention discloses a metal calcium pure calcium cored wire and a manufacturing method thereof. The invention comprises a bright steel band clad layer on the surface of metal calcium core wire, a coating of a thin aluminum layer on the surface of the metal calcium cored wire and the application of a calcium passivation treatment on the surface of the metal calcium wire.
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