STEEL SHEET HAVING HIGH YOUNG''S MODULUS, HOT DIP GALVANIZED STEEL SHEET USING THE SAME , ALLOYED HOT DIP GALVANIZED STEEL SHEET STEEL PIPE HAVING HIGH YOUNG'S ,MODULUS, AND METHODS FOR MANUFACTURING THE SAME

摘要

One aspect of the steel sheet having high Young"s modulus includes in terms of mass %, C: 0.0005 to 0.30%, Si: 2.5% or less, Mn: 2.7 to 5.0%, P: 0.15% or less, S: 0.015% or less, Mo: 0.15 to 1.5%, B: 0.0006 to 0.01%, and Al: 0.15% or less, with the remainder being Fe and unavoidable impurities, wherein one or both of {110}223 pole density and {110}111 pole density in the 1/8 sheet thickness layer is 10 or more, and a Young"s modulus in a rolling direction is more than 230 GPa. Another aspect of the steel sheet having high Young"s modulus includes, in terms of mass %, C: 0.0005 to 0.30%, Si: 2.5% or less, Mn: 0.1 to 5.0%, P: 0.15% or less, S: 0.015% or less, Al: 0.15% or less, N: 0.01% or less, and further comprises one or two or more of Mo: 0.005 to 1.5%, Nb: 0.005 to 0.20%, Ti: at least 48/14xN (mass %) and 0.2% or less, and B: 0.0001 to 0.01%, at a total content of 0.015 to 1.91 mass %, with the remainder being Fe and unavoidable impurities, wherein the {110}223 pole density and/or the {110}111 pole density in the 1/8 sheet thickness layer is 10 or more, and a Young"s modulus in a rolling direction is more than 230 GPa.