Cold-rolled steel strip for high-drawing-performance flux-cored wire, and making method thereof

Abstract

The invention belongs to the technical fields of cold-rolled steel strips for a flux-cored wire, and making methods thereof, and concretely relates to a cold-rolled steel strip for a high-drawing-performance flux-cored wire, and a making method thereof. The cold-rolled steel strip for a high-drawing-performance flux-cored wire comprises 0.0035wt% or less of C, 0.03wt% or less of Si, 0.10-0.25wt% of Mn, 0.008wt% or less of P, 0.005wt% or less of S, 0.005wt% or less of N, 0.02-0.04wt% of Alt, and the balance Fe and other inevitable impurities. The making method of the cold-rolled steel strip for high-drawing-performance flux-cored wire comprises the steps of steelmaking, continuous casting, hot rolling, reeling, cold rolling, annealing, and flattening. The making method reduces the contents of C, Si, P and S, improves the drawing performance of the cold-rolled steel strip for the flux-cored wire, and improves the performances of the heat affected zone of a wedding material; and the appropriate control of the Mn content guarantees the stability of the whole cold-rolled steel strip for the flux-cored wire, and the enough elasticity of the finally-made cold-rolled steel stripe.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled steel strip for flux-cored welding wire and its production, and in particular relates to a cold-rolled steel strip for flux-cored welding wire with high drawing performance and a manufacturing method thereof. Background technique [0002] So far, the development of flux-cored welding wire has mainly gone through three stages. The diameter of the flux-cored welding wire produced at the beginning was ￠3.2mm and ￠2.4mm, and later developed to a diameter of ￠1.2~1.6mm. 1.4mm, so the requirements for high drawability and coil stability of cold-rolled steel strip are getting higher and higher. application, the smelting composition of cold-rolled steel strip for flux-cored wire also puts forward higher requirements. The traditional cold-rolled steel strip for flux-cored welding wire severely restricts the development and application of flux-cored welding wire. The cold-rolled steel strip for flux-co...

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Problems solved by technology

For example, the patent of publication number CN102755992A is a production method of cold-rolled steel strip for flux-cored welding wire. Application in high-end fields, and the annealing adopts continuous annealing process, the yield strength and tensile strength of the steel strip are relatively high, and the elongation is relatively low, so it is difficult to adapt to the production of flux-cored welding wire with a diameter of ￠0.8mm~1.2mm

[0004] For example, the patent of publication number CN102676917A, a preparation method of cold-rolled sheet for flux-cored welding wire, the steel grade is designed according to low carbon 0.005-0.045%, which affects the application of flux-cored welding wire in high-end fields, and the annealing method is Continuous annealing process, the yield strength and tensile strength of the steel strip are relatively high, and the elongation is relatively low, which is difficult to meet the production of flux cored wire with a diameter of ￠0.8mm~1.2mm

[0005] For example, the patent of Publication No. CN102021295B, cold-rolled steel strip for flux-cored welding wire and its manufacturing method, is designed according to low carbon C0.010-0.03%. Although it is produced by bell annealing furnace, its composition reaches Less than the requirements of ultra-low carbon steel, which limits the application of flux cored wire in high-end fields

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