To provide a thick steel plate to be laser-cut which hardly causes a cutting trouble even when the laser cutting machine is used for an unattended operation during night and has superior adhesiveness of scale, and to provide a production method therefor.
The thick steel plate to be laser-cut contains, by mass%, 0.02 to 0.4% Si, has a thickness of 15 to 35 mm, and has a scale layer of 10 to 60 μm on the surface, wherein the scale layer in an amount of 80% or more remains after a bending strain of 3% has been applied thereto. The thick steel plate may include a specified amount of C, Mn, Cu, Ni, P, S, Al and N, or further Cr, Mo, Nb, V, Ti, B, Ca, Mg and REM, in addition to Si. The thick steel plate to be laser-cut having the scale layer of 10 to 60 μm on the surface of the steel plate can be produced through the steps of slab forming, heating, descaling, rolling, water cooling, flatness conditioning and radiational cooling.
COPYRIGHT: (C)2008,JPO&INPIT
Atsushi Kosegawa
Yukio Onuma
Hikaru Okada
Takao Maeda
Takayuki Uemura
Tomoya Fujiwara
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Terutada Hogami
Chihara