Cored wire is an essential metallurgical tool to improve steel quality. It helps in reducing the consumption of various expensive additives and alloying elements.
It can be vertically and stably inserted into molten iron or steel by using a professional cored wire machine. It will melt in ideal position and produce physicochemical reaction, avoids the reaction with air and slag, and increases absorptivity of the added element.
Silicon calcium alloy can be used as a deoxidizer, desulfurizer and metal additive because it has good affinity for oxygen and sulfur. It can improve the quality of steel-making and casting products by removing the inclusions, reducing the content of sulfur and improving plasticity. It also shortens the reduction period in electric furnace steelmaking and reduces power consumption, thereby increasing labor productivity.
The morphology, composition, number, size distribution and melting point of TiOx bearing calcium aluminate inclusions in low aluminum complex deoxidized steel were systematically investigated by experiment and thermodynamic calculation. The results showed that the calcium treatment of liquid steel could effectively change the morphology of large inclusions, thus minimizing their harm on ductile fracture. In addition, the alumina inclusions in the lower aluminum deoxidized steel have lower magnesium oxides (xAl2O3/xCaO = 2.5-3.2) than those in the higher aluminum deoxidized steel.
The calcium cored wire is inserted into the molten steel by using an electric current. When the voltage is applied, the chemical potential of the molten MgCl2 in the Ti cathode is increased, forming a large amount of O species which is removed by the C anode. As a result, the oxidation level of the metal is reduced and the inclusions are modified to become liquid calcium aluminates. In the case of low aluminum deoxidized steel, this is more effective than in high aluminum deoxidized steel, where the alumina inclusions have higher melting points.
The inoculation of molten steel and casting is a very important process in the metallurgical industry. This method can make the smelting process more efficient and improve product quality. In addition, it can also reduce the oxygen content of molten steel and oxide inclusions. It is widely used as a deoxidizer, desulfurizer, alloy additive and denaturing agent for non-metallic inclusions in molten steel. The silicon and calcium in the silicon calcium alloy have a high affinity with oxygen, which makes them effective deoxidizers. In addition, the calcium inoculant can also change the shape of inclusions in molten steel, and improve the performance and plasticity of molten steel.
The calcium inoculant core wire is made from a metal core and a pure solid calcium coating, which is then coated with a thin layer of silicon. The manufacturer uses a professional cored wire machine to vertically and stably insert it into the molten iron or steel at an ideal depth through the wire feeder, which can avoid the reaction with air and slag and improve the absorption of smelting materials.
The insulated calcium inoculant cored wire can effectively prevent nodulation in the water-filling port and ensure the continuity of continuous casting production. It is suitable for ladle feeding technology and can be applied to a wide range of applications in the steelmaking industry, including deoxidation, desulfurization, alloying, microalloying and non-metallic inclusion denaturation.
Calcium aluminum silicon alloy is an important product used in the steel industry. It is a key component in the production of cast iron and high quality rolled products, such as sheet metal and bars. It also has a major influence on the physical properties of these products, especially the strength and corrosion resistance. It is produced in North America and Latin America, and is also exported to Europe and Asia. The global consumption volume is highest in the US and Canada.
The present invention relates to a method for introducing calcium and silicon in the melt of secondary steel. The basic constituent is in divided form, preferably, in a cored wire. The envelope of the cored wire can be made of steel or any metal compatible with the bath to be treated.
In the present invention, the cored wire is used to carry calcium and silicon into the molten steel. This can purify the inclusion morphology, improve the cast ability of the molten steel, and keep stable of the alloy performance function. It can also increase the yield of the alloy, reduce the alloy consumption, and save steelmaking costs.
The present invention also relates to a master alloy for preparing the calcium aluminum silicon alloy. The master alloy is a pre-alloyed mixture of alloying elements. It is commonly called a hardener, grain refiner or modifier, and it is used in the preparation of aluminum wrought alloys for composition adjustments and structure control.
The use of core wire technology enables deoxidation, desulfurization and inclusion modification in the same operation, which is much more effective than conventional methods. This method can purify the liquid steel to a high degree, change the shape of inclusions, improve castability and reduce the consumption of calcium sulfide.
Inclusions in molten steel are very important in determining the mechanical properties of a finished product. For instance, the strain-life curves of an all-round quality steel have been shown to depend strongly on the size and the shape of nonmetallic inclusions (NMI). Hence, in order to obtain a higher fatigue strength, it is necessary to have a low sulfur level and a small diameter inclusion.
It is also required that the morphology of these inclusions is regular rather than irregular. This is difficult to achieve without calcium treatment. In this study, we investigated the effect of calcium treatment on the composition and morphology of inclusions in high carbon hard-wire steel. The results showed that the calcium treatment can modify the morphology of alumina inclusions and make them more spherical.
It is difficult to inject Ca directly into a molten steel bath due to the ferrostatic pressure and solubility of Ca at the steelmaking temperatures. Core wire injection can help to overcome these problems by making contact between Ca vapour and molten steel as intimate as possible.
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