solid calcium cored wire

Solid calcium cored wire can also be called pure calcium cored wire, it is a product of calcium treatment in the refining process outside the furnace of iron and steel enterprises. The main purpose of calcium treatment for molten steel is to deeply reduce the content of harmful elements such as oxygen and sulfur in the steel, to change the composition of inclusions, to avoid nozzle clogging of cast aluminum killed steel and to improve the mechanical properties of steel. The earliest methods of calcium treatment are adding calcium alloy directly into the ladle or spraying calcium alloy into the molten steel, however, due to the unstable treatment effect and high cost, it way eliminated, and the method of feeding ladle with calcium cored wire is now commonly used.

solid-calcium-cored-wire

 

Due to the low density of metal calcium and low melting point and boiling point, it is easy to be oxidized and burned when entering the molten steel, the use of solid calcium cored wire for calcium treatment can avoid this situation. The ladle feeding calcium wire is to break the metal calcium into a certain particle size ( or make calcium wire or calcium stick), then use cold rolled low carbon steel strip to wrap it into a composite material with any length, then with the help of the wire feeder the cored wire of specified length is passed through the slag layer at a certain speed, and reach the bottom of the ladle with molten steel, with the continuous melting of the cored wire at this place, then add calcium to molten steel to produce a chemical reaction.

At present, there are other calcium-containing cored wire such as calcium silicon cored wire and calcium iron cored wire,but compared with solid calcium cored wire, silicon calcium cored wire will increase the silicon content in the refining process outside the furnace, therefore it is not suitable for low silicon steel. The disadvantage of calcium iron cored wire is that powdered calcium has a large specific surface area, and the metal calcium is easily oxidized. In addition, at the refining temperature, when the outer cladding is melted, the exposed calcium quickly vaporizes, which is easy to cause the steel slag liquid surface to violent splash, reduce the yield of calcium.

Due to the relatively active nature of calcium metal, it is easily oxidized and deteriorated, with low density and low melting point and boiling point, therefore, there are the following special requirements in production and use of solid calcium cored wire: the steel belt package should be as tight as possible to block contact with air and reduce oxidative deterioration; The amount of calcium metal contained in the cored wire must be uniform, so as to accurately measure the amount of metal calcium added; The strength of the wrapped steel strip should be able to meet the delay of melting after being poured into the molten steel above 1600 degrees to reach the bottom of the ladle, ensure the full reaction between the metallic calcium and the molten steel, increase the calcium absorption rate, and reduce the burning loss; the purity of calcium must be guaranteed to increase the efficiency of addition.

The diameter of solid calcium cored wire can be custom, generally in 9mm more or less 0.5mm, the purity of calcium can reach 97% or more, Anyang Huatuo Metallurgy now owns three lines of powder wrapped cored wire and two lines solid cored wire production equipment, if you have any require welcome for message.