HIGH STRENGTH AND WEATHER RESISTANCE FLUX CORED ARC WELD METAL UNIT HAVING EXCELLENT ULTRA-LOW TEMPERATURE IMPACT TOUGHNESS

摘要

The present invention provides a flux cored arc weld metal unit having high strength and high weather resistance properties as well as securing excellent impact toughness even under the low-temperature environment which is less than -20?ƒ. The high strength and weather resistance flux cored arc weld metal unit having excellent ultra-low temperature impact toughness is satisfied with, in wt%: C: 0.01-0.1; Si: 0.1-0.5; Mn: 1.0-3.0; Ni: 1.5-3.5; Cu: 0.2-1.0; Cr: 0.1-0.6; Mo: 0.3-1.0; Ti: 0.01-0.1; B: 0.001-0.01; Al: 0.001-0.01; N: 0.003-0.007; P: 0.03 or less; S: 0.03 or less; O: 0.03-0.07; and the remainder Fe and inevitable impurities. The composition of the strength and weather resistance flux cored arc weld metal unit having excellent ultra-low temperature impact toughness is satisfied with 0.9≤Ti/O≤1.3, 7≤Ti/N≤15, 15≤O/B≤24, 1.0≤(Ti+4B)/O≤1.6, 9≤(3Ni+2Mn+Mo)≤14, and 4.5≤(1.5Ni+3Cu+Cr)≤7.;COPYRIGHT KIPO 2014