Steel plate exhibiting excellent bendability by line heating and process for production of the plate

A bending workability, linear heating technology, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as cost increase, and achieve the effects of cost reduction, increase in bending deformation, and reduction in energy consumption

Inactive Publication Date: 2012-07-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The bending process using this linear heating takes a long time to form a predetermined shape, so it is one of the bottlenecks in the shipbuilding process and becomes a major factor of cost increase

Method used

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  • Steel plate exhibiting excellent bendability by line heating and process for production of the plate
  • Steel plate exhibiting excellent bendability by line heating and process for production of the plate
  • Steel plate exhibiting excellent bendability by line heating and process for production of the plate

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Embodiment

[0102] In the steelmaking process, the chemical composition of molten steel is adjusted, and then cast slabs are produced by continuous casting. Table 1 shows the chemical composition. Steel types A to P in the table are steel types satisfying the chemical composition requirements of the present invention, and steel types Q to X are steel types not satisfying the chemical composition requirements of the present invention. In addition, steel grades A to P satisfying the chemical composition requirements of the present invention contain Si≤0.02%, Mn≤0.03%, Cu≤0.03%, Ni≤0.03%, Cr≤0.04%, Mo≤0.004%, Nb≤0.002% %, V ≤ 0.002%, Ti ≤ 0.002%, B ≤ 0.0002%, Ca ≤ 0.0002%, Mg ≤ 0.0002%, REM ≤ 0.0001%. The quality is shown in Table 1. In addition, Ar in the table 3 The transformation point (°C) is obtained by applying heat to austenitizing treatment at 1200°C and then cooling at 0.5°C / sec using Fumasta test pieces prepared from these slabs. The value obtained from the thermal expansion cu...

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Abstract

For the purpose of improving the operating efficiency in the plate bending by line heating, the invention provides a steel plate which exhibits large bending deformation even under the conditions of enhanced heating rate and shortened heating time and a process for production of the plate. The steel plate has both a chemical composition which contains by mass C:0.01 to 0.08%, P: <=0.05%, S: <=0.05%, Al: 0.002 to 0.1%, and N: 0.001 to 0.008% with the balance being iron and unavoidable impurities and a microstructure which comprises a non-deformed ferrite phase at an area fraction of 90% or above and in which the mean grain diameter of theferrite phase is 15 to 45[mu]m and cementite particles having circle-equivalent diameters of 0.5[mu]m or below are present in the ferrite grains at a number density of 100000 particles / mm2 or above. Further, the plate exhibits a yield strength of 235MPa or above at room temperature, a yield strength of 180MPa or below at 400 DEG C, and an average Charpy absorbed energy of 100J or above at 0 DEG C.

Description

technical field [0001] The present invention relates to the field of welded steel structures such as shipbuilding, buildings, bridges, marine structures, etc., especially in the field of shipbuilding, the deformation and forming of steel plates using linear (linear) heating, that is, the use of gas combustion A thick steel plate that has a large amount of deformation and can improve work efficiency in hot working of a steel plate that heats the surface or back of the steel plate in a linear manner, and then water-cools the heated portion to bend the steel plate, and a method for manufacturing the same. Background technique [0002] Ship structures such as ship hulls in the shipbuilding field must have a continuous and smooth surface of curvature in order to reduce water flow resistance during navigation. Therefore, a thick steel plate with a thickness of 10 to 30 mm is mainly bent into a predetermined shape in advance, and then the end faces of the steel plates are welded to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/06C22C38/54
CPCC21D8/0226C21D9/46C21D2211/005C22C38/001C22C38/002C22C38/005C22C38/06
Inventor 中岛清孝皆川昌纪小田直树益田晋宇
Owner NIPPON STEEL CORP
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