HIGH YOUNG'S MODULUS STEEL PLATE, ZINC HOT DIP GALVANIZED STEEL SHEET USING THE SAME, ALLOYED ZINC HOT DIP GALVANIZED STEEL SHEET, HIGH YOUNG'S MODULUS STEEL PIPE, AND METHOD FOR PRODUCTION THEREOF

摘要

An embodiment of a high Young's modulus steel sheet, wherein it has a chemical composition, in mass %, that 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%, Al: 0.15 % or less, and the balance: Fe and inevitable impurities, and wherein both or any of {110}<223> and {110}<111> in a layer at 1/8 of the thickness of the sheet have a pole density of 10 or more and a Young' modulus in the rolling direction of more than 230 GPa: and another embodiment of a high Young's modulus steel sheet, wherein it has a chemical composition, in mass %, that 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 0.015 to 1.91 % by mass in total of one or more of Mo: 0.005 to 1.5 %, Nb: 0.005 to 0.20 %, Ti: (48/14 X N)% to 0.2 % and B: 0.0001 to 0.01%, and the balance: Fe and inevitable impurities, and wherein {110}<223> and/or {110}<111> in a layer at 1/8 of the thickness of the sheet have a pole density of 10 or more and a Young' modulus in the rolling direction of more than 230 GPa.