Calcium silicon aluminum manganese alloy in calcium cored wire is used as deoxidizer,desulfurizer and inclusion control in the steelmaking. It improves the quality of steel making and casting products.
Its operating procedure is short, low cost, fast, efficiently, accurately and easy to grasp. It can solve the problem of mensuration of ferrum calcium line calcium grain purity.
Inoculant feed wires are used for various refining purposes such as deoxidation, desulfurization, inclusion control and alloying. They are also used in the production of nodular cast iron and as a temperature-gaining agent in converter steel making workshop. Inoculant wire feeding equipment is simple in structure, convenient in operation, small in area and investment, safe and reliable.
The compound deoxidizer silicon calcium manganese has a large affinity for oxygen and sulfur, which can make molten steel easy to deoxygenate and de-sulfurize. It can help reduce oxidation and impurity content in liquid steel, improve the performance of steel, avoid casting defects such as nodules, and enhance the toughness of cast iron.
It can be divided into two preparation methods according to the raw materials: one-step method is to produce calcium carbide and silica by reduction with coke and high-carbon ferrosilicon in an electric furnace; and a two-step method is to use calcium carbide,silica and lime to produce silicon calcium alloy in a reduction electric furnace.
The calcium silicon manganese alloy cored wire is a kind of compound deoxidizer used in the converter steel workshop to promote the formation of fine or spherical graphite,making gray cast iron evenly distributed,reducing white cast iron tendency,and increasing silicon,desulfurizing and improving the quality of the finished steel. It is also effective in preventing ladle nozzle nodules and blockage.
Its feeding method is different from the bulk alloy feeding method and the powder spraying method,which can avoid consuming refractory materials,reduce the temperature loss of molten steel to about 5-7 degrees/min,and reduce splashing of molten steel. It is simple in operation, economical in investment, small in space and easy to master.
It has a high affinity for oxygen,sulfur and nitrogen in the molten steel,making it easier to remove the impurities from molten steel than other conventional aluminum-based alloys. It can be widely used in the smelting of low-alloy structural steel,high-strength steel and other products to improve the comprehensive properties of the steel.
The calcium silicon manganese alloy is a deoxidizer and desulfurizer. It makes the graphite evenly distributed in gray cast iron, eliminates heating fragility, increases silicon and improves the quality of steel.
The deoxidizer is able to absorb the sulfur compounds in the flue gas and transform them into simple sulfates, which can be discharged into the atmosphere without harming the environment. The process is more effective than using chemical raw materials and sulfide precipitation technology, which can lead to environmental pollution.
This technology uses natural seawater to wash flue gas and reduce SO2. It can improve the fluidity of molten steel and alleviate nozzle blocking in continuous casting. It also helps to improve the ductility of steel after rolling. The method is easy to operate, low cost, quick, efficiently, accurate, and stable. It can solve the assay method of calcium content in ferrum calcium line. It is a very important method for determining the calcium content of cored wire.
In this study, the morphology, number and size distribution of inclusions in low aluminum deoxidized calcium treated steel were investigated systematically. The results show that a higher aluminum content in steel tended to result in more damage of the composite oxides and a lower calcium treatment effect.
On the basis of the multilayer unreacted core model, a step-by-step reaction kinetic model for modifying the alumina inclusions during the calcium treatment process was developed. The modification times of different radii of inclusions were calculated and showed that the complete transformation from Al2O3 to CA6 took the least time, while the transformation from CA6 to CA2 and from CA to C12A7 required longer times.
The method can effectively reduce the temperature loss of molten steel during the wire feeding process, substantially shorten the operation procedure and reduce energy consumption. It can also improve the quality of cored wire, and provide a safer work environment for workers. It is also applicable to other non-metallic inclusion control methods.
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