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A steel plate with a yield strength of 690mpa that can withstand large heat input welding and its manufacturing method

A high-energy-input welding and yield strength technology, which is applied in the field of low-alloy high-strength steel, can solve the problems of low high-energy-input welding performance of high-strength steel plates, achieve high-energy-input welding performance, improve high-energy-input welding performance, Feasible effect

Active Publication Date: 2020-08-28
NORTHEASTERN UNIV LIAONING
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  • 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 with a yield strength of 690 MPa that can withstand large heat input welding and its manufacturing method, to solve the problem of low welding performance of high-strength steel plates with large heat input energy, and to achieve comprehensive performance of strength and toughness and large heat input welding performance Significant improvement of

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  • A steel plate with a yield strength of 690mpa that can withstand large heat input welding and its manufacturing method
  • A steel plate with a yield strength of 690mpa that can withstand large heat input welding and its manufacturing method

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Embodiment 1

[0025] In this embodiment, the steel plate with a yield strength of 690 MPa that can withstand large heat input welding, its chemical composition includes: C 0.01%, Si 0.2%, Mn 1.9%, Nb 0.02%, V 0.05%, Ti 0.005% , P0.003%, S 0.002%, Cu 0.05%, Ni 0.5%, Cr 0.05%, Mo 0.5%, B 0.0005%, N 0.001%, H 0.0002%, O 0.005%, Al 0.01%, Mg 0.001%, The balance is Fe; among the inclusions with a size of 0.2-3μm in the steel plate, the number of Ti-Mg-O composite inclusions accounts for 50%; the Ti-Mg-O inclusions contain an average of Ti15% by mass fraction; The number of inclusions with a size of 3 μm or more is 30-50 / mm 3 .

[0026]The manufacturing method of the above-mentioned steel plate: the oxygen content at the end of LD converter smelting is 650ppm, the carbon content is 0.05%, and the phosphorus content is 0.003%; RH vacuum decarburization is performed, the carbon content in molten steel is 0.008%, and the oxygen content is 150ppm; The content is 0.002%; RH vacuum degassing treatmen...

Embodiment 2

[0029] In this example, the steel plate with a yield strength of 690 MPa that can withstand large heat input welding, its chemical composition includes: C 0.04%, Si 0.1%, Mn 1.7%, Nb 0.01%, V 0.02%, Ti 0.015% , P0.005%, S 0.005%, Cu 0.5%, Ni 0.4%, Cr 0.45%, Mo 0.15%, B 0.0025%, N 0.005%, H 0.0001%, O 0.004%, Al 0.015%, Ca 0.001%, The balance is Fe; among the inclusions with a size of 0.2-3μm in the steel plate, the number of Ti-Ca-O composite inclusions accounts for 30%; the Ti-Ca-O inclusions contain an average of Ti25% by mass fraction; The number of inclusions with a size of 3 μm or more is 10 to 30 pieces / mm 3 .

[0030] The manufacturing method of the above-mentioned steel plate: the oxygen content at the end of LD converter smelting is 710ppm, the carbon content is 0.04%, and the phosphorus content is 0.005%; RH vacuum decarburization is performed, the carbon content in molten steel is 0.004%, and the oxygen content is 250ppm; content of 0.005%; RH vacuum degassing tre...

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Abstract

The invention belongs to the technical field of low-alloy high-strength steel, and in particular relates to a 690MPa grade steel plate with a yield strength that can withstand large linear energy welding and a manufacturing method thereof. The chemical composition of the steel plate includes C 0.01~0.04%, Si 0.1~0.3%, Mn 1.7~2.2%, Nb 0.01~0.05%, V 0.01~0.05%, Ti 0.005~0.025%, P 0.001~0.008%, S 0.001~0.005 %, Cu 0.05~0.5%, Ni 0.05~0.5%, Cr 0.05~0.5%, Mo 0.05~0.5%, B 0.0005~0.0025%, N 0.001~0.005%, H 0.00002~0.0002%, O 0.001~0.005%, Al 0.001~0.015%, and one of Mg and Ca, the balance is Fe; among the inclusions with a size of 0.2~3μm in the steel plate, Ti‑Mg‑O or Ti‑Ca‑O composite inclusions account for more than 10% , and contains an average of 1 to 50% Ti; the number of inclusions with a size of 3 μm or more in the steel plate is ≤120 / mm 3 . Using the LD‑RH‑LF‑RH smelting process, Ti and Mg or Ca are added when the molten steel is oxygenated at 150 to 300 ppm; two-stage controlled rolling and cooling are adopted. The steel plate of the present invention has excellent strength and toughness and can withstand large line energy welding of 100-200kJ / cm.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel, and particularly relates to a steel plate with a yield strength of 690 MPa and a manufacturing method thereof that can withstand large heat input welding. 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 va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/54C22C38/48C22C38/46C22C38/44C22C38/42C22C38/50C22C38/06C22C33/04C21C7/10C21C7/068C21C7/06C21D8/02
CPCC21C7/0006C21C7/06C21C7/068C21C7/10C21D8/0226C21D8/0263C21D2211/005C22C33/04C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 王超王丙兴王昭东邓想涛王国栋
Owner NORTHEASTERN UNIV LIAONING
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