The use of calcium silicon iron treatment process with Calcium Cored Wire improves the quality of steel making. It can reduce nodulation in continuous casting and eliminate blockage of the nozzle of ladle.
Compared with spraying calcium alloy into the ladle, this method has more stable treatment effect and higher calcium recovery. It also avoids uneven mixing of metal calcium powder and iron powder.
The feeding position of the Calcium Silicon Iron treatment process with Calcium Cored Wire is critical. This is because the optimum calcium recovery is achieved only when the cored wire reaches a sufficient depth in the molten steel. This depth is determined by the diameter and sheath thickness of the cored wire as well as the injection rate.
The optimum feeding position for the Calcium Cored Wire is determined by a comprehensive analysis of plant data. In order to ensure the best possible calcium recovery, the injection rate should be adjusted so that the cored wire reaches a sufficient level in the molten steel before it starts to melt and floats up.
The cored wire injection method allows the deoxidizer to reach the deeper position of the molten steel more easily than the spraying method. This makes it possible to carry out deoxidation, desulfurization and nonmetal inclusion sex change without causing any undesirable metallurgical effects.
The feeding speed has a direct impact on the calcium absorption rate. The feeding speed should be reasonable and keep it stable. If the feeding speed is too fast, the core wire will not melt into the molten steel and can't perform its function.
Core wire for calcium treatment has a variety of types. These include powder wrapped calcium cored wire, solid calcium cored wire and arc spray calcium wire. Different types have different functions in the metallurgy process. The correct method of using cored wires can greatly improve the efficiency and quality of the calcium treatment.
Metal calcium is used to increase the fluidity and cleanliness of molten steel, reduce inclusions, modify the sulphide morphology, control nozzle clogging in cast aluminum killed steels and make it easier for degassing to take place. Generally, it is added to liquid steel after trim additions and argon rinsing. Depending on the steel grade, additional treatments with Ca are also made to improve the fluidity of high alloy steels and prevent slag formation.
With the development of science and technology, more and more types of additives are used in steel smelting. Among them, cored wires are especially important for calcium treatment. The correct sequence of addition and the way they are added can greatly enhance their effect. Cored wires are available in many different types, including silicon calcium wire, calcium iron cored wire and pure solid calcium wire.
Compared with powdered calcium, pure solid calcium wire has a higher specific density and lower melting point. It is also easier to control the feeding rate. This means that it can penetrate deeper into molten steel and stay longer, which is more favorable for calcium recovery.
In addition, the outer cladding of the pure solid calcium wire is much thicker than that of the calcium iron cored wire, so it is not easily oxidized when entering molten steel. This reduces the generation of oxycarbide and increases the efficiency of calcium treatment.
The yield during the calcium silicon iron treatment process with Calcium Cored Wire largely depends on the feeding position and the feed speed. The ideal feeding point should be at the center of the molten steel flow and away from the argon blowing circle. The feed speed should be reasonable and not too fast or too slow. Too fast can cause the calcium core wire to float and disappear from the molten steel and too slow can result in low calcium absorption.
Cored wire is made of a cold rolled low carbon strip wrapped with alloy powder and is used for deep calcium treatment of molten steel. It can deeply reduce the content of harmful elements including oxygen and sulfur, change the composition of inclusions and avoid nozzle clogging of cast aluminum killed steel. It is widely used in apricot gold, desulfurization, spheroidization, inoculation and creeping treatment of cast iron. Cored wire has the advantage of a lower consumption and can effectively reduce costs.
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