Metal-cored wires can significantly reduce weld defects and save production time. They also offer a number of environmental advantages.
The encapsulated pure calcium wire in steel sheath is called cored wire and is widely used for steelmaking de-oxidation, desulphurization and inclusion modification. It can achieve high calcium recovery and improve steel performance.
The pollution of molten steel is a big problem for the iron and steel industry. It comes in the form of dust-granular particulates, acid emissions and toxic gases. These pollutants affect human health and the environment and must be controlled.
The advantage of calcium cored wire is that it does not need to be melted before being fed into the molten steel. This reduces the consumption of calcium by 3-4 times and makes it possible to save money on the alloying charge.
The calcium cored wire is inserted smoothly into the molten steel. It is then melted to the ideal depth for a physicochemical reaction. It reduces the spinels into aluminates and further transforms them to low melting point inclusions that are easier to float in the molten steel. This helps to purify molten steel, prevent clogging during continuous casting and improve the castability of the finished product. It also reduces the consumption of precious elements and the cost of refining.
In the current market, the main raw material calcium-silicon alloy is in a stable trend. Its price is lower than that of calcium iron wire, and its consumption in tons of steel is the same as that of pure solid calcium wire. It also helps reduce the amount of precious elements added and saves a lot of cost.
Calcium treatment by injection of cored wire is an efficient and ultimate refining technology for secondary steel smelting, which can improve the quality of molten steel by deoxidation, desulfurization, modification of non-metallic inclusions and casting ability etc. It has become an important way for purifying molten steel, and its application value is quite high.
The cored wire mainly consists of two parts, the outer layer is made of low carbon steel strip, and the inner part is pure solid calcium powder. Compared to the traditional calcium spraying method, the use of cored wire has some advantages, such as the lower energy consumption, higher calcium recovery and safer operation.
The use of cored wire in a steel plant significantly reduces the amount of precious elements added to tons of steel. This is because it can purify the molten steel, change the shape of inclusions and improve castability. In addition, the cored wire can also improve oxygen and sulphur recoveries in the steel melt.
Cored wire is also easier to machine, which means fewer resources are used in the production process. Furthermore, it can increase the productivity of steel plants by reducing the number of threading times.
Although the gas-shielded and self-shielding tubular wires may look similar on the spool, they are metallurgically very different. Therefore, it is not correct to treat them as a single welding process. This can lead to problems such as powder leakage line and uneven feeding. Hence, it is important to understand the process and make proper adjustments. In this way, you can ensure a high level of quality in the end product.
Calcium treatment by injection of cored wire is a fundamental technology in steel refining. It can reduce the oxygen and sulphur content of molten steel, modify the shape of inclusions, improve castability and greatly increase the yield of ferroalloy. Its economic effect is remarkable and it has many advantages over bulk alloy feeding method or powder spraying method.
Solid core calcium wire is made of an outer steel strip wrapped with silicon or calcium containing alloy powder, and is wound into a coil to look like a rope. It has the advantage of high tensile strength and toughness, hard to break, and is easy to handle in operation. It is also more stable compared with calcium iron wire and more economical compared to conventional products.
The cored wire feeds smoothly and does not slip or run in the molten steel, which saves the work intensity of workers and increases the yield of the calcium slag. It is also easy to control the dosage of alloy addition.
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