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Steel for flux-cored wire jacket and manufacturing method thereof

A technology of flux-cored welding wire and shell, applied in rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of poor uniformity of welding wire diameter, prone to breakage, high content of impurity elements, etc., and achieve good uniform ductility, Guaranteed strength and hardness, and the effect of less alloying elements

Inactive Publication Date: 2011-02-09
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of poor composition matching between spcc or 08Al steel used as flux-cored welding wire shell steel and flux core, high content of impurity elements, poor purity, low elongation, prone to broken bands, and uniform diameter of the welding wire In order to provide a kind of medicine with high strength, high purity, excellent ductility, low yield ratio, simple production process, low manufacturing cost, and easy to realize industrialized mass production. Steel for core welding wire shell and production method thereof

Method used

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  • Steel for flux-cored wire jacket and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition (by weight%) of the steel is: C 0.038, Si 0.003, Mn 0.29, Cu 0.05, Al 0.019, RE: 0.005, P 0.008, S 0.005, N 0.0013, and the balance is Fe and other unavoidable impurities The composition of the steel grade is subjected to smelting processes such as molten iron desulfurization, converter blowing, and RH vacuum treatment, and is continuously cast into billets; hot rolling is carried out: the starting rolling temperature is controlled at 1080°C, the final rolling temperature is controlled at 900°C, and the total rolling reduction rate The control is 90%; after hot rolling, it is coiled at 580°C; after that, it is pickled, cold rolled in a single stand, annealed in bell furnace, finished and oiled for packaging. The final rolling specification after single stand cold rolling is 0.8mm.

[0025] After testing, the performance of the finished steel strip is R el =176MPa, R m =325MPa, A=53%. The superiority of the technical index lies in that its ten...

Embodiment 2

[0027] The chemical composition of the steel (by weight%) is: C 0.012, Si 0.009, Mn 0.2, Cu 0.015, Al 0.015, RE: 0.001, P 0.01, S 0.008, N 0.002, and the balance is Fe and other unavoidable impurities The composition of the steel grade is subjected to smelting processes such as molten iron desulfurization, converter blowing, RH vacuum treatment, etc., and is continuously cast into billets; hot rolling: the starting rolling temperature is controlled at 1045°C, the final rolling temperature is controlled at 875°C, and the total rolling reduction The production rate is controlled at 90%; after hot rolling, it is coiled at 520°C; after that, it is pickled, cold rolled in a single stand, annealed in bell furnace, finished and oiled for packaging. The final rolling specification of cold rolling is 1.0mm.

[0028] After testing, the performance of the finished steel strip is R el =175MPa, R m =320MPa, A=48%. The superiority of the technical index lies in that its tensile strength ...

Embodiment 3

[0030] The chemical composition of the steel (by weight%) is: C 0.017, Si 0.005, Mn 0.255, Cu 0.025, Al 0.017, RE: 0.0021, P 0.010, S 0.007, N 0.0019, the balance is Fe and other unavoidable steel The components are subjected to molten iron desulfurization, converter blowing, RH vacuum treatment and other smelting processes, and are continuously cast into billets; hot rolling: the starting rolling temperature is controlled at 1030°C, the final rolling temperature is controlled at 860°C, and the total rolling reduction rate is controlled. It is 90%; after hot rolling, it is coiled at 550°C; after that, it is pickled in sequence, cold rolled in a single stand, annealed in bell furnace, finished and oiled for packaging. The final rolling specification of cold rolling is 0.8mm.

[0031] After testing, the performance of the finished steel strip is R el =170MPa, R m =315MPa, A=50%. The superiority of the technical index lies in that its tensile strength reaches 315MPa, the yield r...

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Abstract

The invention relates to steel for a flux-cored wire jacket and a manufacturing method thereof. The steel solves the problem that the existing steel has bad component matching degree with the flux core, more impurity element content, low elongation percentage and low welding wire deposited metal obdurability, and easily produces strip breakage, and the like. The measure is as follows: the steel comprises chemical constituents according to the weight percentage: 0.012-0.038% of C, 0.003-0.009% of Si, 0.20-0.29% of Mn, 0.015-0.05% of Cu, 0.015-0.19% of Al, 0.001-0.005% of Re, less than or equalto 0.01% of P, less than or equal to 0.008% of S, less than or equal of 0.002% of N, the rest of Fe and unavoidable impurities. The manufacturing method is as follows: carrying out melting proceduressuch as hot metal desulfurization, converter blowing, RH vacuum treatment and the like on steel ball components which are continuously cast and form a briquette; and then carrying out hot rolling andreeling; and finally pickling, cold rolling a single rack, cover annealing, finishing, oiling and packaging. The steel has low carbon, silicon and phosphorus, low yield ratio, high purity, good ductility and component matching with the flux-core.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, in particular to a steel for a flux-cored wire shell and a manufacturing method thereof. Background technique [0002] Among the existing welding materials, flux-cored wire is the product with the highest technical content, and is also known as the fourth generation product of welding materials. Flux-cored welding wire has the advantages of both gas-shielded solid-core welding wire and submerged arc welding wire, high efficiency, automation and electrode varieties, wide adaptability, and good welding process performance. It has become the most promising welding material today, representing The development direction of contemporary welding materials. The application of flux-cored welding wire in my country began in the early stage of Baosteel's construction in the 1980s. At that time, the SAN-55A flux-cored welding wire of Japan's Nippon Steel was imported. Until 2000, the applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16B21B37/74B21B37/16
Inventor 陈浮缪凯王玉涛黄治军黄成红阮新建孔江勇
Owner 武钢集团有限公司
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