ZINC-BASED ALLOY-PLATED STEEL MATERIAL EXCELLENT IN RESISTANCE TO MOLTEN-METAL EMBRITTLEMENT CRACKING
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United States of America Patent
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Issued Date -
Dec 29, 2011
app pub date -
Mar 9, 2010
filing date -
Mar 10, 2009
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Abandoned
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Abstract
[Problem] To provide a zinc-based alloy-plated steel material in which low-carbon steel is used as the base material and which is excellent in resistance to molten-metal embrittlement cracking and has good workability.[Means for Resolution]A zinc-based alloy-plated steel material excellent in resistance to molten-metal embrittlement cracking, which has a zinc-based alloy-plating layer on the surface of a steel base material that has a chemical composition comprising, as % by mass, C: 0.010 to 0.100%, Si: at most 1.50%, Mn: at most 2.00%, P: at most 0.100%, S: at most 0.030%, N: at most 0.0050%, Ti: at most 0.050%, and B: 0.0003 to 0.0100%, with a balance of Fe and inevitable impurities, and having the value L to be defined by the following formula, L={(Ti/48)+(B/11)}/(N/14), of at least 5.50, and has a metallographic structure comprising ferrite: 10 to 99% by volume with a balance of bainite, pearlite, cementite or martensite.
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