Silicon calcium alloy acts as deoxidizer and desulfurizer to change shape of steel impurities to improve fluidity, machinability, ductility and impact toughness. This rare earth ferroalloy can also be used as a purifier and inoculant in iron casting and steelmaking.
Cored wire technology is an out-of-furnace refining method. The core powder layer is vertically inserted into molten iron or steel through professional wire feeder, and a chemical reaction occurs through argon stirring.
Calcium Silicon Manganese Steel Iron Alloy Metallurgy with Cored Wire is widely used in the production of high-quality steel and special alloys. It can be used as a deoxidizer and desulfurizer in the steelmaking process, improving the quality of finished products. It is also suitable for use as a heat-treating agent in converter steel-making workshops, and as an inoculant and additive in nodular cast iron production.
Silicon and calcium have strong affinity for oxygen, making them ideal compound deoxidizers and desulfurizers. They can also absorb sulfur and nitrogen, eliminating the need for separate deoxidizers. These benefits make silicon calcium manganese alloys an economical solution for steelmakers.
In addition, calcium silicon manganese alloy can help control the shape and size of oxide and sulfide inclusions, thereby enhancing fluidity, machinability, ductility and impact properties. It can also reduce the consumption of expensive additives and alloying elements, saving valuable slag resources.
The core powder layer of the core wire consists of a mixture of Si-Al-Ba-Ca rare earth ferroalloy, barium silicate and metal calcium. The special formula makes the core powder have an excellent grasping ability for oxygen atoms and sulfur atoms in the molten steel, allowing it to perform its dual functions of deoxidizing and desulfurizing. Its high temperature resistance and quick insertion ability also contribute to its effectiveness in the steelmaking process.
The use of calcium silicon manganese steel iron alloy cored wire allows alloy powders to be inserted into the molten steel more efficiently, avoids reaction with air and slag and increases absorptivity of metallurgy additives. It can also be used to deoxidize and desulfurize the molten steel, control the shape and size of oxide and sulfide inclusions in the steel, improve fluidity and machinability, ductility and impact strength.
During free travel, the temperature increase of the cored wire is much more intense than that of the reference wire, due to the abrupt volatilization of calcium contained in its steel liner (vapor pressure around 1.8 atm at 1600° C). This produces violent turbulence in the liquid steel that may pollute it with calcium oxide or re-nitride it. It can also produce splashes of liquid steel that cross the slag layer, oxidize in contact with air and fall off the ladle.
The application of a layer of Kraft paper between the steel liner and the cored wire can protect it from this temperature increase. Numerical simulations show that the paper can delay the increase in temperature of the cored wire by 0.4 seconds, or a total time of 0.7 seconds before destruction. This can be seen in curves 15 b and c in FIGS. 2 and 3, compared with the results obtained for the reference wire (curve 21 a). The protective effect of the layers of paper outside the steel liner can be increased with increasing the thickness of the layer of paper.
The cored wire consists of a solid calcium core, which is encased in and in contact with a steel liner. The steel liner is protected by an external layer of Kraft paper. By the application of this protective layer, it is possible to delay the increase in temperature by a time of about 0.8 seconds (see curve 20 b), which means that the steel liner has plenty of time to melt before the cored wire is destroyed.
The fact that the cored wire can be vertically and stably inserted into the molten iron or steel at an ideal position thanks to professional wire feeding equipment also enables it to act more effectively. The fusion of the metallurgical additives is improved and their absorption by the liquid metal is increased, while reactions with air and slag are avoided.
Moreover, the use of this type of wire improves the cleanliness of the steel, and it can even change the nature and morphology of inclusions. This results in lower nonmetallic impurity levels, fewer stringer and pancake inclusions, a more homogeneous structure and better fatigue resistance. These advantages can be a significant factor in improving the quality of steel. The ladle refining process can be simplified, and the amount of metallurgical additives required is greatly reduced. This translates into significantly lower production costs, which in turn contribute to a higher profitability for manufacturers.
Incorporation of calcium silicon manganese steel into the iron alloy improves the fatigue behavior of cast components, increasing the transition fatigue life of short cracks. This can help to avoid the crack propagation, reducing stress concentration and the risk of premature failure. It also allows for better mechanical processing of the parts during forming, resulting in improved performance and safety.
Silicon manganese alloy is a kind of steelmaking deoxidant and desulfurizer. It is suitable for basic oxygen furnace and electric arc furnace steelmaking processes. It can remove the oxides and sulfides in molten steel, improve the castability of molten steel, increase the amount of silicon in molten steel, and make steel more ductile, malleable, and impact tough. In addition, the silicon and calcium in this alloy have a strong affinity for oxygen, making it an effective deoxidizer.
The core powder layer of calcium silicon manganese steel iron alloy is mainly composed of a variety of rare earth elements with good synergistic effects, which can enhance the penetration ability of the core powder in molten steel and improve the grasping ability of the calcium silicate core in molten steel. Moreover, a small amount of samarium can be added to further improve the penetration and deoxidation ability of the core powder layer. This can ensure that the core powder reaches every corner of the molten steel and achieves a perfect chemical reaction.
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