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

A technology of cold-rolled steel strip and flux-cored welding wire, which is applied to the field of cold-rolled steel strip for flux-cored welding wire and its production, can solve the problems of unreachable composition, low elongation, high yield strength and tensile strength of steel strip, Achieve the effect of obvious aging problem, stable winding performance and improving drawing performance

Inactive Publication Date: 2013-09-04
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The cold-rolled steel strip for high-drawability flux-cored wire includes the following components by weight: C 0.003%, Si 0.01%, Mn 0.15%, P 0.006%, S 0.003%, N 0.0025%, Alt (acid soluble aluminum) 0.032%, the balance is Fe and other unavoidable impurities.

[0058] The manufacturing method of the cold-rolled steel strip for the high-drawability flux-cored welding wire comprises the following steps:

[0059] (1) Steelmaking: a. Deep de-slagging of molten iron: Firstly, according to the requirements of the first-level slag removal, that is, the liquid surface is exposed to more than 3 / 4, remove the former slag of the molten iron, and then perform KR pretreatment on the molten iron at 1300-1380°C , when the rotating speed is 60r / min, add the desulfurizing agent according to the standard of 7 kg of desulfurizing agent / 1 ton of molten iron, and stir at a rotating speed of 85-95r / min. The content is 0.003%;

[0060] b. De-P and pre-de-C by double slag method of...

Embodiment 2

[0073] The cold-rolled steel strip for high-drawability flux-cored welding wire includes the following components in weight percentage: C0.0025%, Si 0.01%,

[0074] Mn 0.20%, P 0.005%, S0.002%, N 0.0030%, Alt 0.03%, the balance is Fe and other unavoidable impurities.

[0075] The manufacturing method of the cold-rolled steel strip for the high-drawability flux-cored welding wire comprises the following steps:

[0076] (1) Steelmaking: a. Deep desulfurization of molten iron: firstly remove the former slag of molten iron according to the requirements of the first-level slag removal, that is, the liquid surface is exposed to more than 3 / 4, and then perform KR pretreatment on the molten iron at 1300-1380°C. When the rotating speed is 60r / min, add desulfurizing agent according to the standard of 7kg desulfurizing agent / 1 ton of iron, and stir at a rotating speed of 85-95r / min. After stirring for 12 minutes, remove the slag so that the S content in the 0.002%;

[0077] ...

Embodiment 3

[0090] The cold-rolled steel strip for high-drawability flux-cored welding wire includes the following components in weight percentage: C0.0035%, Si 0.009%,

[0091] Mn 0.15%, P 0.007%, S 0.0008%, N 0.0040%, Alt 0.025%, the balance is Fe and other unavoidable impurities.

[0092] The manufacturing method of the cold-rolled steel strip for the high-drawability flux-cored welding wire comprises the following steps:

[0093] (1) Steelmaking: a. Deep desulfurization of molten iron: firstly remove the former slag of molten iron according to the requirements of the first-level slag removal, that is, the liquid surface is exposed to more than 3 / 4, and then perform KR pretreatment on the molten iron at 1300-1380°C. When the rotating speed is 60r / min, add desulfurizing agent according to the standard of 7kg desulfurizing agent / 1 ton of iron, and stir at a rotating speed of 85-95r / min. After stirring for 12 minutes, remove the slag so that the S content in the 0.0008%;

[0094] ...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21D8/04
Inventor 张瑞堂李平徐宝杰李洪翠董凯刘爱民李长新
Owner JIGANG GRP
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