Calcium is a key element in the deoxidation, desulphurization and inclusion modification of the steelmaking process. Cored wire makes calcium addition more cost effective and efficient.
The low density and high reactivity of pure calcium require special addition methods. Cored wire enables the blown calcium powder to be injected deep into the liquid steel. This reduces caster nozzle clogging and provides higher calcium recovery.
Core wire is an indispensable technology in the secondary steel refining process. It can be used to introduce calcium, silicon iron and other additives into molten steel more efficiently. It is also able to play the role of deoxidization, desulfurization, changing inclusions' shape and eliminating them, which improves the quality of the molten steel and casting product.
The calcium core is made by pressing and stuffing it with a mixture of calcium particles and cold-rolled low-carbon steel strip through a professional cored wire machine. The core is filled with the alloy powder using a special method to ensure that it is completely compact and leakage-free. Its excellent ductility makes it the ideal compound additive in steel smelting. It also reduces the number of precious elements added to molten steel, which helps to save cost.
In steel industry, it is widely used for De-oxidation, Desulfurization and Inclusion modification. The encapsulated pure metal calcium wire in steel sheath is injected into the molten steel through cored wire injection system, achieving higher metallurgical performance than the conventional calcium powder added directly into the steel melt.
The cored wire has a high-density pure calcium and is easy to inspect its quality, the smaller specific surface area minimizes other oxide that exists in powder cored wire from entering into the molten steel, thus more conducive to the production of pure steel. It also avoids the plug of nozzle clogging, making it more stable.
By using welded sheath, it can be hermetically encapsulated and not open in the molten steel until it is sufficiently deep into the liquid. Thus, losses due to evaporation are minimized.
The use of calcium cored wire can greatly increase the smelting yield, shorten the smelting time and accurately control the content of easily oxidizable elements. It can also partly change the nature and shape of inclusions and improve the quality of the molten steel.
Cored wires made with welded sheath exhibit much better metallurgical performance than those with powder sheath. They can be injected into the liquid steel at a greater speed, and are more able to avoid nozzle clogging.
Pure calcium cored wire for steelmaking is mainly used in desulfurization, deoxidation, alloying, microalloying, modification of inclusions and calcium treatment of continuous cast steel. It is also commonly used in steel-making shop assistant materials to prevent silicon deposits in welds. It is packed in drums, with argon gas filling to protect the product from contamination.
The encapsulated pure metal calcium wire in steel sheath (called cored wire) is used for deoxidation, desulfurization and inclusion modification in the steelmaking process. The sheath is welded tightly, and the core has a uniform diameter and excellent toughness that makes it difficult to break, which makes it more conducive to accurate control of wire feeding.
This type of cored wire allows welding operators to travel faster and deposit more weld metal, which can lead to significant productivity increases in certain applications. But it’s important to know when metal-cored wire is most effective so that you can use it in the most cost-efficient way possible. For example, using cored wire in short circuit mode of transfer or for components prone to burn-through can increase your welding costs without increasing efficiency or quality.
Cored wire is a tubular wire filled with metallic powders or alloys. Metal-cored wire offers a wide arc profile that can better bridge gaps than solid wire. It also produces less spatter, which reduces the time and cost associated with activities such as grinding or applying anti-spatter compound.
Compared with the traditional method of adding calcium by solid calcium wires, the use of cored wire makes it possible to add calcium to molten steel more efficiently. This method can help reduce the oxidation of calcium in the slag layer, increase the absorptivity of metallurgy additives and shorten the time of calcium recovery.
In addition, cored wire is capable of forming a stronger weld bead than solid calcium, which is important for applications prone to burn-through.
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