Steel sheet applicable to ultrahigh heat input welding and manufacturing method thereof

A manufacturing method and technology of super-large wire, applied in the field of low-alloy high-strength steel, to achieve the effect of being conducive to popularization and application, microstructure refinement, and strong feasibility

Pending Publication Date: 2019-02-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a steel plate suitable for ultra-large heat input welding and its manufacturing method, to solve the problem that the steel plate has a refined microstructure and maintain good impact toughness under the condition of ultra-large heat input welding. Adapt to 500~1500kJ / cm super large input energy welding

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  • Steel sheet applicable to ultrahigh heat input welding and manufacturing method thereof

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Embodiment 1

[0026] In this embodiment, the steel plate suitable for ultra-large heat input welding, its chemical composition includes by weight percentage: C 0.1%, Si 0.2%, Mn 1.1%, Nb 0.015%, V 0.025%, Ti 0.025%, P 0.003% , S 0.003%, Cu 0.02%, Ni 0.1%, Cr 0.1%, Mo 0.05%, B 0.0001%, N 0.005%, O 0.002%, Al 0.005%, Mg 0.001%, Zr 0.01%, the balance is Fe ; Among the inclusions with a size of 0.5-5 μm in the steel plate, the number of Ti-Mg-Zr-O-Mn-S composite inclusions accounts for 40%; among the inclusions with a size of 0.02-0.5 μm in the steel plate, the number of MgO type The number accounts for 35%; 35% of the number of inclusions in the steel plate have V carbonitrides precipitated.

[0027]The manufacturing method of the above-mentioned steel plate: pre-deoxidize silicon manganese aluminum in the molten steel smelting process, add Ti and V when the oxygen is set to 20ppm, add Zr when the oxygen is further set to 10ppm at 1.5min, and add Mg when the oxygen is set to 5ppm again after 1...

Embodiment 2

[0030] In this embodiment, the steel plate suitable for ultra-large heat input welding, its chemical composition includes by weight percentage: C 0.15%, Si 0.1%, Mn 2.0%, Nb 0.05%, V 0.1%, Ti 0.015%, P 0.002% , S 0.005%, Cu0.5%, Ni 0.5%, Cr 0.01%, Mo 0.5%, B 0.002%, N 0.008%, O 0.005%, Al 0.015%, Mg0.0005%, REM (rare earth elements) 0.01% , the balance is Fe; among the inclusions with a size of 0.5-5 μm in the steel plate, the number of Ti-Mg-REM-O-Mn-S composite inclusions accounts for 30%; among the inclusions with a size of 0.02-0.5 μm in the steel plate, The number of MgO-type inclusions accounts for 15%; 50% of the number of inclusions in the steel plate have V carbonitrides precipitated.

[0031] The manufacturing method of the above-mentioned steel plate: during the molten steel smelting process, silicon-manganese-aluminum pre-deoxidation is used, Ti and V are added when the oxygen is set to 200 ppm, REM is further added when the oxygen is set to 90 ppm in 8 minutes, an...

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Abstract

The invention belongs to the technical field of low-alloy and high-strength steels, and particularly relates to a steel sheet applicable to ultrahigh heat input welding and a manufacturing method. Thesteel sheet comprises the chemical components of C, Si, Mn, Nb, V, Ti, P, S, Cu, Ni, Cr, Mo, B, N, O, Al, Mg, one of Zr and REM, and the balance Fe, wherein the types of inclusions with different sizes in the steel sheet are controlled, and thus the obvious refining of a structure in a welding heat influencing area is realized; the adding technology of Ti, Zr, REM, Mg, V and N in the smelting process is controlled; special inclusion distribution in the steel is realized; and meanwhile, the high toughness of the steel sheet is improved through a controllable rolling and cooling technology. Thesteel sheet is applicable to 500-1500kj/cm ultrahigh heat input welding and meets the demands of the fields such as the field of buildings on steels for ultrahigh heat input welding.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel, and in particular relates to a steel plate suitable for ultra-large heat input welding and a manufacturing method thereof. Background technique [0002] Most of the engineering applications of medium and thick steel plates involve welding processes. In order to ensure the quality of welded joints, strict control of welding parameters is required. The conventional welding heat input is below 50kJ / cm, increasing the heat input can improve the welding efficiency and shorten the engineering manufacturing cycle. Especially for thick steel plates, the conventional welding method requires multiple welding passes, and requires tedious auxiliary work before welding and between layers. However, the large heat input welding method can be formed in one pass, and the production efficiency can be increased several times or dozens of times. Therefore, in various engineering fields, the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/46C22C38/50C22C38/42C22C38/44C22C38/54C22C38/06C21D8/02C21D1/28C21D1/25
CPCC21D1/25C21D1/28C21D8/0226C21D8/0247C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 王超王丙兴王昭东田勇王国栋
Owner NORTHEASTERN UNIV
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