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FLUX CORED ARC WELD METAL JOINT HAVING SUPERIOR CTOD IN LOW TEMPERATURE AND STEEL MEMBER HAVING THE WELD METAL JOINT
FLUX CORED ARC WELD METAL JOINT HAVING SUPERIOR CTOD IN LOW TEMPERATURE AND STEEL MEMBER HAVING THE WELD METAL JOINT
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机译：低温下药芯焊丝电弧焊具有优越的焊点性能，焊缝金属接头具有钢焊缝
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摘要
The present invention relates to a weld metal joint subjected to flux cored arc welding (FCAW) used for weld structures, such as ships, buildings, bridges, marine structures, steel pipes, and line pipes, and a steel member having the weld metal joint, and more particularly, to a flux cored arc weld (FCAW) metal joint having excellent CTOD properties at low temperature and a steel member having the FCAW metal joint. A flux cored arc weld metal joint having excellent CTOD properties at low temperature may include, by weight: 0.01 to 0.2% C, 0.1 to 0.5% Si, 1.0 to 3.0% Mn, 0.5 to 3.0% Ni, 0.01 to 0.1% Ti, 0.0010 to 0.01% B, 0.005 to 0.05% Al, 0.003 to 0.006% N, at most 0.03% P, at most 0.03% S, 0.03 to 0.07% O, the FCAW metal joint satisfying a relation of 0.7=Ti/O=1.3, 6=Ti/N=12, 7=O/B=12, and 1.2=(Ti+4B)/O=1.9, and the balance of Fe and unavoidable impurities, the FCAW metal joint including a microstructure having acicular ferrite of 85% or more and at least one of the balance of bainite, grain boundary ferrite, and polygonal ferrite. A steel member includes the metal weld joint. According to the invention, there is provided a flux cored arc weld metal joint having a high- strength property and CTOD properties at low temperatures and a steel member having the metal weld joint.
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机译：焊接金属接头及具有焊接金属接头的钢构件技术领域本发明涉及一种用于焊接结构的焊接金属接头以及用于具有焊接金属接头的钢构件，该焊接金属接头用于诸如船舶，建筑物，桥梁，海洋结构，钢管和管线管的焊接结构。特别是涉及在低温下具有优异的CTOD特性的药芯焊丝（FCAW）金属接头以及具有该FCAW金属接头的钢构件。在低温下具有优异的CTOD性能的药芯焊丝焊缝可包括0.01-0.2％C，0.1-0.5％Si，1.0-3.0％Mn，0.5-3.0％Ni，0.01-0.1％Ti， B为0.0010至0.01％，Al为0.005至0.05％，N为0.003至0.006％，P以至多0.03％S，O至0.03至0.07％O，FCAW金属接头满足0.7 = Ti / O = FCAW金属接头具有1.3、6 = Ti / N = 12、7 = O / B = 12、1.2 =（Ti + 4B）/O=1.9以及其余的Fe和不可避免的杂质的余量。贝氏体，晶界铁素体和多边形铁素体中的至少一种为85％以上。钢构件包括金属焊接接头。根据本发明，提供了一种在低温下具有高强度性能和CTOD性能的药芯焊丝电弧焊接金属接头以及具有该金属焊接接头的钢构件。
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