Cold-rolled steel strip for flux-cored wire and production method of cold-rolled steel strip

Abstract

The invention relates to a cold-rolled steel strip, in particular to a cold-rolled steel strip for a flux-cored wire, and further relates to a production method of the cold-rolled steel strip. The cold-rolled steel strip and the production method mainly solve the technical problems of incapability of achieving good match of strength and plasticity, poor machine-shaping performances and the like of an existing cold-rolled steel strip for a flux-cored wire. The cold-rolled steel strip for the flux-cored wire chemically comprises, by weight, 0.005-0.010% of C, not more than 0.03% of Si, 0.10-0.19% of Mn, not more than 0.015% of P, not more than 0.010% of S, 0.015-0.050% of Alt, the balance Fe and inevitable impurity elements. By the aid of the cold-rolled steel strip and the production method, low carbon, low silicon and aluminum deoxidation are used as grain refinement elements, and technologies including inclusion morphology control, hot continuous rolling controlled cooling and continuous annealing temperature control are used for production, so that yield strength and hardness of the steel strip can be guaranteed to be within the specified range beneficially. Besides, the cold-rolled steel strip for the flux-cored wire has the advantages of high percentage elongation after fracture, excellent machine-shaping performance and welding performance, high cost performance and the like.

Description

technical field [0001] The invention relates to a cold-rolled steel strip, especially a cold-rolled steel strip for flux-cored welding wire, and also relates to a manufacturing method thereof. Background technique [0002] Welding materials are mainly divided into manual electrodes, copper-plated solid wires, submerged arc fluxes and flux-cored wires. As a new generation of high-efficiency and high-performance welding materials, flux cored wire is very popular in various industries. At present, most welding material manufacturers generally use SPCC when selecting cold-rolled strip steel for flux-cored welding wire, but the carbon content of SPCC has a wide range, and the carbon content is controlled at 0.04-0.15%, which meets the requirements, and the carbon content fluctuates greatly. As a result, the strength and plastic toughness of the material cannot be well matched, and the stability of performance is also poor, which increases the difficulty of controlling the equipm...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cold-rolled steel strip for flux-cored welding wire with yield strength in the range of 190-240MPa and hardness HR30T in the range of 30-50, and provide its manufacturing method at the same time, mainly to solve the problem of existing flux-cored welding wire The strength and plasticity of cold-rolled strip steel cannot be well matched, and the processing and forming performance is poor and other technical problems

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