A steel plate with a yield strength of 690mpa that can withstand large heat input welding and its manufacturing method
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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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[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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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 particularly relates to a yield strength 690 MPa class steel plate capable of bearing high heat input welding and a manufacturing method of the yield strength 690 MPa class steel plate. The steel plate comprises chemical components including 0.01%-0.04% of C, 0.1%-0.3% of Si, 1.7%-2.2% of Mn, 0.01%-0.05% of Nb, 0.01%-0.05% of V, 0.005%-0.025% of Ti, 0.001%-0.008% of P, 0.001%-0.005% of S, 0.05%-0.5% of Cu, 0.05%-0.5% of Ni, 0.05%-0.5% of Cr, 0.05%-0.5% of Mo, 0.0005%-0.0025% of B, 0.001%-0.005% of N, 0.00002%-0.0002% of H, 0.001%-0.005% of O 0.001%-0.015% of Al, one of Mg and Ca and the balance Fe. Ti-Mg-O or Ti-Ca-O compound occluded foreign substances accounts for 10% or higher in occluded foreign substances with the size being 0.2 micron to 3 microns, and in addition, an average of 1%-50% of Ti is contained; and the number of the occluded foreign substances with the size being 3 microns or higher in the steel plate is smaller than or equal to 120 pieces / mm<3>. An LD-RH-LF-RH smelting process is adopted, and when oxygen in molten steel is fixed to be 150 ppm to 300 ppm, Ti and Mg or Ca are added; and two-stage controlled rolling and controlled cooling are adopted. The steel plate has good toughness performance and can bear 100 kJ / cm to 200 kJ / cm high heat input welding.
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...
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