Arc welding joint

Abstract

The purpose of this invention is to provide an arc-welded joint. This invention is an arc-welded joint formed by joining steel plates together through weld metal. The steel plates have: a steel plate composition; and a microstructure with ferrous sulfate as the base phase. The steel plate composition, by mass%, contains: C: 0.10% to 0.70%, Si: less than 1.00%, Mn: 20.0% to 40.0%, P: less than 0.030%, S: less than 0.0070%, Al: 0.010% to 5.000%, Cr: 0.500% to 7.000%, N: 0.005% to 0.050%, O: less than 0.0050%, Ti: less than 0.005%, and Nb: 0.005%. The weld metal comprises, but is composed of, Fe and unavoidable impurities; the weld metal has: a weld metal composition; and a microstructure with ferroferrite as the base phase; the weld metal composition, by mass%, contains: C: 0.05% to 1.00%, Si: 0.05% to 1.00%, Mn: 25.0% to 40.0%, P: less than 0.100%, S: less than 0.100%, Al: 0.005% to 5.000%, Cr: 0.400% to 10.000%, N: less than 0.400%, and O: less than 0.1500%, and the remainder comprises, Fe and unavoidable impurities.

Images