Wire rod for low-carbon flux-cored welding wires and manufacture method thereof

Abstract

The invention provides a wire rod for flux-cored welding wires, prepared from the following chemical components: 0.001-0.050 percent of C, 0.001-0.050 percent of Si, 0.10-0.24 percent of Mn, not more than 0.012 percent of S, not more than 0.015 percent of P, not more than 0.007 percent of N, not more than 0.06 percent of Al, not more than 0.05 percent of Cu, not more than 0.08 percent of Ni, not more than 0.07 percent of Cr, not more than 0.01 percent of V, not more than 0.0002 percent of Hg, 0.003 percent of Ca and 0.01 percent of Sn. The manufacture method of the wire rod for low-carbon flux-cored welding wires comprises a smelting step, a rolling controlling step and a cooling controlling step, wherein the smelting step comprises refining outside a furnace under a vacuum degree smaller than 2 tau at a controlled final temperature of 1590+ / -20 DEG C, the rolling controlling step comprises finishing mill rolling at 875-925 DEG C and reducing-sizing mill rolling at 825-925 DEG C, and the cooling controlling step adopts a high line Stelmor line to control cooling. The invention solves the technical problem of joint difficulty increase brought by the improvement of the hardness and the strength of steel in the production process of the wire rod for the low-carbon flux-cored wires and has practical values.

Description

technical field The invention belongs to the field of metallurgy, and in particular relates to the chemical element design and manufacturing technology of a wire rod for low-carbon flux-cored welding wire. Background technique Flux-cored welding wire is a high-efficiency welding material developed in the 1950s. It inherits the advantages of adjustable electrode composition and overcomes the shortcomings of non-continuous and automatic welding of electrodes. Its deposition efficiency can even be as high as 4 times that of manual electrodes. , also has a series of advantages such as smooth and beautiful weld formation, small welding deformation, easy operation, and variety of varieties. Every sector of industrial production. my country began to develop flux-cored welding wire in the 1960s, but it was rarely used in production until the end of the 1980s. After entering the 1990s, according to market demand, especially the construction needs of a large number of export ships i...

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Problems solved by technology

At the same time, no relevant documents related to the materials of the present invention have been found through domestic and foreign related patents and data retrieval of publicly released materials.

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