Cantor Colburn LLP
Steel sheet having excellent resistance to liquid metal embrittlement cracks and method for manufacturing the same
Provided is a steel sheet having excellent resistance to liquid metal embrittlement cracks and a method for manufacturing the same. The steel sheet includes, by weight %, 0.04% to 0.35% of C, 0.99% or less of Al+Si, 3.5% to 10% of Mn, 0.05% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), and 0.02% or less of N (excluding 0%) with a remainder of Fe and other inevitable impurities, wherein the steel sheet comprises a microstructure comprising at least 10% of residual austenite, at least 60% of annealed martensite and 20% or less of alpha martensite and epsilon martensite, by volume fraction, and an average thickness of a Mn-depleted layer is at least 0.5 μm from a product surface.
POSCO
C C C C C C C C C C B C C C C B C C C C C C C C C C C C C
C21D C21D C23C C22C C22C C21D C23C C21D C21D C21D B32B C21D C21D C23C C23C B32B C23C C21D C22C C21D C22C C21D C22C C21D C21D C22C C22C C22C C23C
inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional additional inventional additional inventional additional inventional inventional inventional inventional inventional inventional inventional
Ki-Cheol Kyoo-Young Sea-Woong Joo-Hyun
Kang Lee Lee Ryu