Shunji Hiwatari

TL;DR: In this paper, a hot dip galvanized steel sheet is composed of C, Si, Mn, P, S, Al and N. The problem of improving tensile strength and press workability of a steel sheet by specifying the contents of C and Si, and specifying the relation between the amounts of Si and C, and between the amount of Cr and Mn to be added is solved.

TL;DR: In this article, a steel sheet which has a composition consisting of, by mass, 0.1 to 0.4%, 0.001 to 3.0%, 1.5 to 4.0% Si, 1.1% P, ≤0.05% S, 0,005 to 0,1% Al, ≤ 0.01% N and the balance Fe with inevitable impurities was heated at 1 to 100°C/sec heating rate, held in a temperature region of 700 to 850°C for 10 to 6,000 sec and then press formed in a

TL;DR: In this paper, the authors proposed a high yield ratio and high strength hot-rolled steel plate having excellent weldability and ductility is a steel containing, by mass%, over 0.68 or more and less than 0.0040 of B and the balance of iron and inevitable impurities.

TL;DR: In this article, an embodiment of a high Young's modulus steel sheet, wherein it has a chemical composition comprising, by mass, C: 0.0005 to 0.30%, Si: 2.5% or less, Mn:0.1 to 5.0%, P: 0,015 to 1.5%, Nb: 0., 0.005 to 0., and Ti: 48/14×N (mass%) to 0,

TL;DR: In this article, the authors proposed a method to provide a high-strength steel sheet, a high strength galvanized steel sheet and a highstrength galvannealed steel sheet in a class of 440 to 780 MPa which have excellent strength-flanging properties and impact resistance, and provide a production method therefor.