Thick steel plate suitable for large heat input welding in EH420 grade marine engineering and preparation method thereof

A technology for high-energy welding and marine engineering, applied in metal rolling and other directions, can solve the problems of limited ability of intragranular ferrite nucleation and microstructure refinement, unfavorable high-energy welding performance of thick steel plates, complex production process, etc. Achieve the effect of promoting the nucleation ability of intragranular acicular ferrite, strengthening the nucleation ability of intragranular acicular ferrite, and facilitating the popularization and application

Active Publication Date: 2019-02-12
NORTHEASTERN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The production process of the above-mentioned prior art is complex, the control is difficult, or it is difficult to form fine high-melting point inclusions uniformly dispersed in the steel, which can affect the nucleation and microstructure refinement of intragranular ferrite in the heat-affected zone of high-energy welding. Limited, which is not conducive to the significant improvement of the welding performance of thick steel plates for marine engineering with large heat input

Method used

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  • Thick steel plate suitable for large heat input welding in EH420 grade marine engineering and preparation method thereof
  • Thick steel plate suitable for large heat input welding in EH420 grade marine engineering and preparation method thereof
  • Thick steel plate suitable for large heat input welding in EH420 grade marine engineering and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this example, EH420-grade thick steel plates for marine engineering can be welded with large heat input, and the chemical composition of the steel plates includes: C 0.05%, Si 0.2%, Mn 1.7%, P 0.005%, S 0.002%, Nb 0.01 %, Ti0.005%, Cu 0.2%, Ni 0.5%, N 0.006%, O 0.001%, Al 0.005%, Mg 0.001%, Ca0.001%, the balance is Fe; Al-Mg-Ti-Ca-Mn-O-S composite inclusions accounted for 30%; Al-Mg-Ti-Ca-Mn-O-S inclusions contained 10% Al and 5% Mg on average by mass fraction , Ti10%, Ca 8%, 30% of the inclusions contain magnesium aluminum spinel structure inside, and the outer layer contains Ca oxysulfide and Mn sulfide.

[0032] The above steel plate preparation method includes the following steps: using deep desulfurized molten iron and low-sulfur steel scrap, the scrap steel ratio is ≤ 10%, adding silico-manganese to the ladle for deoxidation alloying when the steel output of the converter is 1 / 3, and the oxygen content of the molten steel after the furnace is 10ppm ; Add ferro...

Embodiment 2

[0036] In this embodiment, EH420 grade thick steel plate for ocean engineering can be welded with large heat input, and the chemical composition of the steel plate includes: C 0.08%, Si 0.3%, Mn 1.5%, P 0.001%, S 0.004%, Nb 0.03 %, Ti0.015%, Cu 0.4%, Ni 0.3%, N 0.005%, O 0.003%, Al 0.01%, Mg 0.0005%, Ca0.005%, the balance is Fe; Al-Mg-Ti-Ca-Mn-O-S composite inclusions accounted for 40%; Al-Mg-Ti-Ca-Mn-O-S inclusions contained an average of 12% Al and 6% Mg by mass fraction , Ti15%, Ca 10%, 40% of the inclusions contain magnesium aluminum spinel structure inside, and the outer layer contains Ca oxysulfide and Mn sulfide.

[0037] The above-mentioned steel plate preparation method includes the following steps: using deep desulfurized molten iron and low-sulfur steel scrap, the scrap steel ratio is ≤ 10%, adding silico-manganese to the ladle for deoxidation alloying when the steel output of the converter is 1 / 2, and the oxygen content of the molten steel after the furnace is 150p...

Embodiment 3

[0041] In this example, EH420-grade thick steel plates for marine engineering can be welded with large heat input, and the chemical composition of the steel plates includes: C 0.12%, Si 0.1%, Mn 1.0%, P 0.01%, S 0.005%, Nb 0.04 %, Ti0.025%, Cu 0.5%, Ni 0.5%, N 0.001%, O 0.001%, Al 0.025%, Mg 0.005%, Ca0.0005%, the balance is Fe; Al-Mg-Ti-Ca-Mn-O-S composite inclusions accounted for 50%; Al-Mg-Ti-Ca-Mn-O-S inclusions contained an average of 15% Al and 7% Mg by mass fraction , Ti10%, Ca 5%, 50% of the inclusions contain magnesium aluminum spinel structure inside, and the outer layer contains Ca oxysulfide and Mn sulfide.

[0042] The above steel plate preparation method includes the following steps: using deep desulfurized molten iron and low-sulfur steel scrap, the scrap steel ratio is ≤ 10%, adding silicon manganese to the ladle for deoxidation alloying when the steel output of the converter is 2 / 3, and the oxygen content of the molten steel after the furnace is 200ppm Add fe...

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Abstract

The invention belongs to the technical field of low-alloy high-strength steel, and particularly relates to a thick steel plate suitable for large heat input welding in EH420 grade marine engineering and a preparation method of the thick steel plate. The steel plate comprises the following chemical components of, by mass percentage, 0.05-0.12% of C, 0.1-0.3% of Si, 1.0-1.7% of Mn, 0.001-0.01% of P,0.001-0.005% of S, 0.01-0.04% of Nb, 0.005-0.025% of Ti, 0.2-0.5% of Cu, 0.2-0.5% of Ni, 0.001-0.006% of N, 0.001-0.005% of O, 0.005-0.025% of Al, 0.0005-0.005% of Mg, 0.0005-0.005% of Ca and the balance of Fe. Al-Mg-Ti-Ca-Mn-O-S composite inclusions account for more than 10% of inclusions with the sizes of 0.5-5 [mu]m in the steel plate and have special compositions. The steel plate is preparedaccording to the steps of adding silicon and manganese when steel is discharged from a converter, and feeding calcium wires, titanium wires, magnesium wires and aluminum wires during LF and RH refining; and adopting two-stage controlled rolling and controlled cooling. Particles of the inclusions in the steel plate are favorable for fine dispersion and distribution, have a better capability of promoting acicular ferrite nucleation, and can obviously improve low-temperature toughness of large 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 thick steel plate for EH420 grade ocean engineering that can be welded with large heat input and a preparation method thereof. Background technique [0002] With the implementation of my country's marine power strategy, the development of marine resources and the construction of marine engineering facilities have developed rapidly. Marine structures continue to be high-end, deep-sea, and large-scale, and the demand for high-performance marine engineering steels has increased significantly. Usually, the welding workload for building such large structures accounts for about 30-40% of the total workload. Therefore, on the premise of ensuring the welding quality, how to improve the welding efficiency is the key to realize low-cost and economical manufacturing. The steel plate for welding with high input energy can reduce the number of welding pass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/14C22C38/08C22C38/02C22C38/04C22C38/06C22C33/04B21B1/46
CPCB21B1/46C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14C22C38/16
Inventor 王丙兴王昭东王超贾国生李玉谦杜琦铭王国栋梅东贵
Owner NORTHEASTERN UNIV
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