Smelting method for improving copper strip plasticity

Abstract

The invention relates to a smelting method for producing copper strips with bright surface, no crack and good plasticity. The smelting method for improving copper strip plasticity is characterized in that rare-earth element cerium is added in pure copper by a mode of intermediate alloy, the input amount is 105-120g per ton of copper water, and the casting process flow is as follows: burdening, smelting, warming, adding cerium, entering a holding furnace by subcurrent type copper water, casting, milling face, cold blooming, annealing, pickling, finish rolling, annealing of an air cushion furnace, stretch bending, slitting and packaging. The rare-earth element cerium hardly dissolves in copper by a solid mode, a bit of addition of the cerium is in favor of mechanical property of copper and has no obvious influence on copper conductivity, and the important point is that cerium can form high-melting-point compounds with impurities of lead and bismuth in copper which are distributed in copper water in fine spherical particles, thus being in favor of nucleating, refining crystal particles, improving high-temperature plasticity of copper and enhancing copper elongation by adding cerium.

Description

technical field [0001] The invention relates to a smelting method for producing a red copper strip with bright surface, no cracks and good plasticity. Background technique [0002] Due to the high copper content and good thermal conductivity of red copper, it is easy to form coarse columnar crystals in the horizontal continuous casting process, and the fluidity of copper water is poor, which causes cracks on the surface of the copper billet, and the melt is easily polluted during the smelting process. The high-temperature melt contains a certain amount of gas. During the casting process, it is very easy to cause the billet to contain a large number of dispersed micro-pores, resulting in rolling cracks, delamination and other defects, which affect the yield. The inhalation tendency of copper water during smelting is beneficial to the refining of copper water. The coupling type crystallizer adopts a steam chamber between the primary water cooling system and the secondary water...

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Problems solved by technology

[0002] Due to the high copper content and good thermal conductivity of red copper, it is easy to form coarse columnar crystals in the horizontal continuous casting process, and the fluidity of copper water is poor, which causes cracks on the surface of the copper billet, and the melt is easily polluted during the smelting process. The high-temperature melt contains a certain amount of gas. During the casting process, it is very easy to cause the billet to contain a large number of dispersed micro-pores, resulting in rolling cracks, delamination and other defects, which affect the yield. The inhalation tendency of copper water during smelting is beneficial to the refining of copper water. The coupling type crystallizer adopts a steam chamber between the primary water cooling system and the secondary water cooling system to protect the surface of the billet from oxygen and avoid copper strips. Oxidation of the surface, but the production effect is still not ideal

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