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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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