Core-spun yarn and preparation method thereof

Abstract

The invention relates to a core-spun yarn which comprises a sheath and a core material, wherein the core material is tightly filled in the sheath. The invention is characterized in that the sheath comprises an outer steel sheet layer and an inner metal layer; both sides of the sheath are folded inwards at the joints of the sheath and are extruded and fixed; the melting point of the metal layer is smaller than that of steel; and the thickness of the metal layer is 0.2mm, and the thickness of the steel sheet layer is 0.2mm. The double-layer composite sheath is adopted to lower the melting point of the surface covering layer on the premise of ensuring the basic strength of the core-spun yarn, so that the tape base can be molten within a short time in the molten iron casting process, thereby fully displaying the action of the powder inoculant, ensuring the inoculation effect of the molten iron flow and ensuring the mechanical properties of the iron castings. The invention has the advantages of firm sheath joints, tightly filled powder, regular and symmetric appearance, high working stability, high degree of automation and simple overall structure, and is convenient for maintenance and quick for operation.

Description

technical field [0001] The invention relates to a cored wire and a method for manufacturing the cored wire, belonging to metallurgical auxiliary materials. Background technique [0002] In the modern metallurgical process, it is usually necessary to add various solvents, trace alloys, etc. to the molten iron. When casting and producing high-grade cast iron or ductile iron, the method of inoculation treatment must be adopted. In the inoculation treatment, the method of adding the inoculant and the amount of the inoculant greatly affect the quality of the casting. If the inoculant is added too early, the effect of inoculation will not be achieved due to the decline of inoculation; if the inoculant is added too much, it will not only waste but also easily increase the shrinkage tendency of the casting; if it is added too little, the expected purpose will not be achieved. After research, inoculation with flow is an effective new technology. It is to add a certain specification ...

AI Technical Summary

Problems solved by technology

[0004] Adding various alloy elements to the steel strip cored wire (spheroidizing wire, inoculating wire) in the molten iron ladle has a good effect, but in the process of inoculation with the flow, the contact time of the cored wire with the flow is relatively short, requiring The cored wire has a relatively low melting point and is easy to melt. Only when the outer covering layer of the cored wire is melted can the role of the powder inoculant be fully utilized to achieve timely inoculation and synchronous inoculation to ensure the inoculation effect of the molten iron flow and improve the downstream product cast iron. The mechanical properties of the parts, but the current cored wire is covered with steel sheets for inoculation with flow. However, due to the high melting point of steel, it cannot be melted rapidly during the inoculation process, and the mixing of the core material and molten iron is not good. Uniform, unable to give full play to the role of powder inoculant

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