Continuous cast slab and producing method therefor

Details Continuous cast slab and producing method therefor Continuous cast slab and producing method therefor

B - Operations, Transporting

22

D

B22D 11/124 (2006.01) B22D 11/00 (2006.01) B22D 11/22 (2006.01) C22C 38/00 (2006.01) C22C 38/08 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2730174

A continuous cast slab includes the following component: by mass%, C: 0.01 ~ 0.3%, Si: 0.05 ~ 0.5%, Mn: 0.4 ~ 2%, P: 0.03% or less, S: 0.03 or less, Al: 0.005 ~ 0.03%, Ni: 0.2 ~ 2%, O: 0.006% or less, and N: 0.006% or less; wherein the balance is composed of Fe and inevitable impurities; wherein a structure in steel in a region within at least 2 mm from a broad surface is composed of ferrite and pearlite and a equivalent circular diameter of ferrite grains in the region is equal to or shorter than 30 µm.

L'invention porte sur une brame coulée en continu qui contient en masse C : 0,01 à 0,3 %, Si : 0,05 à 0,5 %, Mn : 0,4 à 2 %, P : 0,03 % ou moins, S : 0,03 % ou moins, Al : 0,005 à 0,03 %, Ni : 0,2 à 2 %, O : 0,006 % ou moins, et N : 0,006 % ou moins, le reste étant constitué par Fe et des éléments d'impureté inévitables, et dans laquelle la structure d'acier dans l'espace d'au moins 2 mm depuis les surfaces des faces latérales consiste à la fois en ferrite et en perlite avec les diamètres de cercle équivalents des grains de ferrite qui sont de 30 µm ou au-dessous.

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