High-strength steel having excellent brittle crack arrestability and welding part brittle crack initiation resistance, and production method therefor
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A technology of high-strength steel and brittle cracking, which is applied in the field of high-strength steel materials and its manufacturing, and can solve problems such as economic efficiency degradation
Active Publication Date: 2018-08-03
浦项股份有限公司
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[0033] The inventors of the present disclosure conducted studies and experiments to improve yield strength, brittle crack arrest, and weld zone brittle crack initiation resistance of thick steel materials, and proposed the present disclosure based on the results thereof.
[0034] In an exemplary embodiment, the steel composition, microstructure and manufacturing conditions of the steel material can be controlled, thereby improving the yield strength, brittle crack arrest and brittle crack initiation resistance of the weld zone of the thick steel material.
[0035] The main idea of an exemplary embodiment is as follows.
[0036] 1) Appropriate control of steel composition to increase strength through solid solution strengthening. Specifically, the contents of manganese (Mn), nickel (Ni), copper (Cu) and silicon (Si) are optimized for solid solution strengthening.
[0037] 2) Proper control of steel composition to increase strength by increasing hardenability. Specifically, ...
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Abstract
The purpose of another aspect of the present invention is to provide a high-strength steel having excellent brittle crack arrestability and welding part brittle crack initiation resistance, and a production method therefor. According to one aspect of the present invention, provided are a high-strength steel having excellent brittle crack arrestability and welding part brittle crack initiation resistance, and a production method therefor, the high-strength steel: comprising, in wt%, C: 0.05-0.09%, Mn: 1.5-2.2%, Ni: 0.3-1.2%, Nb: 0.005-0.04%, Ti: 0.005-0.04%, Cu: 0.1-0.8%, Si: 0.05-0.3%, Al: 0.005-0.05%, P: 100ppm or less, S: 40ppm or less, and a remainder made up by Fe and other inevitable impurities; having a center part microstructure comprising an acicular ferrite and granular bainite mixed-phase, upper bainite, and a remainder made up by one type or more selected from the group consisting of ferrite, pearlite, and a martensite-austenite (MA) constituent; having, in a 2mm or less subsurface region, a surface part microstructure comprising ferrite and a remainder made up by one type or more among bainite and martensite; and having a welding heat affected zone, which is formed during welding, that comprises, in area%, 5% or less of a martensite-austenite constituent. According to the present invention, high-strength steel having high yield strength, excellent brittle crack arrestability, and excellent welding part brittle crack initiation resistance may be obtained.
Description
technical field [0001] The present disclosure relates to a high-strength steel material having excellent brittle crack arrest and weld zone brittle crack initiation resistance and a method of manufacturing the same. Background technique [0002] Recently, in consideration of domestic and international design requirements for structures used in the fields of ships, marine transportation, construction, and civil engineering, the development of ultra-thick steel plates with high strength properties is required. [0003] In the case where high-strength steel is included in the structural design, using a steel plate having a relatively reduced thickness can easily perform machining and welding operations while economical benefits can be obtained due to reduction in structural weight. [0004] In general, in the case of high-strength steel, since the reduction ratio decreases when producing a thick steel plate, sufficient deformation is not performed compared with a thin steel pla...
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