A kind of high-quality welding wire steel wire rod and its production method

Abstract

The invention discloses a high-quality welding wire steel wire rod and a production method thereof. The high-quality welding wire steel wire rod comprises 0.05-0.07% of C, 0.85-0.95% of Si, 1.45-1.65%of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, smaller than or equal to 0.010% of Al, 0.0001-0.0004% of Ca, smaller than or equal to 0.0040% of N, smaller than orequal to 0.0030% of O and the balance Fe and inevitable impurities. The content of calcium in the produced wire rod is not larger than 0.0004%, and in the welding process, and the metal splashing ratedoes not exceed 1.0%; and after a welding wire steel wire rod produced by adopting a common process is machined into a welding wire, the metal splashing rate is 3.2% or so, and the splashing rate inthe welding process is remarkably reduced. The welding cost can be reduced easily, it is guaranteed that wire feeding is smooth, electric arc combustion is stable, and a gas protecting welding effectis achieved very well.

Description

technical field [0001] The invention belongs to the field of welding wire steel, and in particular relates to a high-quality welding wire steel wire rod and a production method thereof. Background technique [0002] Low alloy CO with a strength of 500MPa 2 Wire rod for gas shielded welding wire can be processed into solid welding wire after a series of processes such as drawing and copper plating. It is widely used in ships, pipelines, construction machinery, containers, petrochemicals, high-rise buildings, bridges, and super-lifting transportation. Various fields such as equipment, power station, boiler and pressure vessel. Using CO 2 Welding with gas-shielded welding wire can satisfy the development of high-quality, high-efficiency, and low-cost welding production, but more metal spatter will be generated during welding, and some molten metal of the welding wire will fly out of the molten pool, which not only reduces the melting coefficient of the welding wire, but also ...

AI Technical Summary

Problems solved by technology

And continue to use synthetic slag in the refining furnace. The synthetic slag contains fluorite. Using fluorite as a slag agent can thin the thicker slag to increase the fluidity of the slag and make it easy to desulfurize and dephosphorize. The decomposition of calcium fluoride at high temperature will inevitably produce a large amount of calcium ions, which will further pollute the molten steel; 3. The qualified molten steel obtained through LF refining is directly put on the machine for protective casting, and the inclusions in the steel are not effectively removed , most of the inclusions in steel are composite inclusions containing calcium, and the calcium content in steel cannot be effectively reduced without reducing the number of inclusions

It is extremely difficult to control the calcium content in the steel to below 0.0004%. The calcium content of the ER70S-6 hot-rolled wire rod produced by the above patented process will reach 0.0020%, so it is difficult to effectively reduce the spatter in the welding process

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