Stainless steel product containing b and method for...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/54 (2006.01) B21B 3/02 (2006.01) B21B 37/00 (2006.01) B23K 9/04 (2006.01) B23K 15/00 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/44 (2006.01) B21B 1/02 (2006.01)

Patent

CA 2498585

A stainless steel slab containing B, wherein a protecting material is joined onto at least two faces across the bloom from each other in a stainless steel bloom containing B of 0.3 - 2.5 mass %, being integrated into one-piece by forming a weld metal comprising a stainless steel with chemical composition that satisfies the relationship expressed by following formulas (1) - (4), and a method to produce a steel product by rolling said slab. Further, it is preferable to interpose an insert material between above stainless steel bloom and above protecting material in bonding process. 15~Cr eq~30 --- (1), 4~Cr eq - Ni eq~17 --- (2), Cr eq = Cr + 1.5 Si + Mo - 5 B --- (3), Ni eq = Ni + 30 (C + N) + 0.5 Mn --- (4) Herein, each symbol of a chemical element designates the content (mass %) of relevant chemical element contained in steel. Accordingly, it makes it possible to subject a stainless steel slab containing B to hot working without generating edge cracking, so as to be used as a source material of a neutron shielding container and a separator of a fuel cell.

L'invention concerne un bloom d'acier inoxydable contenant du bore, qui comprend un bloom d'acier inoxydable contenant entre 0,3 et 2,5 % de bore et une matière de protection assemblés à l'aide d'un métal fondu, dont les composants chimiques satisfont aux formules suivantes (1 à 4) : </= éq Clr5 </= 30 --- (1), 4 </= éq Cr éq Ni </= 17 --- (2), éq Cr = Cr + 1,5 Si + Mo 5B --- (3), et éq Ni = Ni + 30(C + N) + 0,5 Mn --- (4). Le symbole d'un élément représente la teneur de l'acier en cet élément ( % en poids), destiné à être incorporé dans le bloom ; le bloom d'acier inoxydable contenant du bore comprend aussi de préférence une matière qu'on insère entre le bloom et la matière de protection pendant l'assemblage. L'invention concerne également un procédé de production d'un produit d'acier, qui comporte une étape de laminage du bloom d'acier inoxydable contenant du bore. Ledit bloom peut être laminé à chaud sans produire de fissures d'angle, et peut servir de matériau de blindage neutronique et de séparateur dans une pile à combustible.

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