Carbon steel ferrous product, namely for galvanization, and...

Details Carbon steel ferrous product, namely for galvanization, and... Carbon steel ferrous product, namely for galvanization, and...

C - Chemistry, Metallurgy

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C22C 38/18 (2006.01) B22D 11/06 (2006.01) C21D 8/02 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/20 (2006.01) C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/30 (2006.01) C22C 38/40 (2006.01) C22C 38/60 (2006.01) C21D 8/12 (2006.01)

Patent

CA 2415244

A metallurgical product, made of carbon steel and to be galvanized, which is in the form of a strip or of a sheet obtained from a continuously cast intermediate product having the following composition by weight: - 0,0005%<=C<=0,15%; - 0,08%<=Mn<=2%; - Si<=0,040%, preferably<=0,030%; - Al total<=0,010%, preferably<=0,004%; - Al soluble<=0,004%; - 0,0050%<=O total<=0,0500%, and of prefererce <=0,0300%; - P<=0,20%, preferably<=0,03%; - S<=0,10%, preferably<=0,03%; - each of Cu, Cr, Ni, Mo, W, Co<=1 %, preferably<=0,5%; - each of Ti, Nb, V, Zr<=0,5%, preferably<=0,2%; - each of Sn, Sb, As<=0,1%; - B<=0,1%, preferably<=0,01%; - N<=0,0400%, preferably<=0,0150%; and the remainder being iron and impurities. Also, a process for obtaining a metallurgical intermediate product, which includes: producing in a ladle a liquid steel the composition of which is C, Mn, Si, Al, P, S, Cu, Cr, Ni, Mo, W, Co, Ti, Nb, V, Zr, Sn, Sb, As, B and N as above, and in which the dissolved oxygen content is maintained between 0.0050 and 0.0500% by the establishment of a chemical equilibrium between the metal and the ladle slag; and casting the steel on a continuous casting machine.

Produit sidérurgique en acier au carbone, destiné à être galvanisé, caractérisé en ce qu'il se présente sous forme d'une bande ou d'une tôle obtenue à partir d'un demi-produit coulé en continu de composition en poids: - 0,0005%<=C<=0,15%; - 0,08%<=Mn<=2%; - Si<=0,040%, de préférence<=0,030%; - Al total<=0,010%, de préférence<=0,004%; - Al soluble<=0,004%; - 0,0050%<=O total<=0,0500%, et de préférence<=0,0300%; - P<=0,20%, de préférence<=0,03%; - S<=0,10%, de préférence<=0,03%; - chacun de Cu, Cr, Ni, Mo, W, Co<=1 %, de préférence<=0,5%; - chacun de Ti, Nb, V, Zr<=0,5%, de préférence<=0,2%; - chacun de Sn, Sb, As<=0,1%; - B<=0,1%, de préférence<=0,01%; - N<=0,0400%, de préférence<=0,0150%; le reste étant du fer et des impuretés résultant de l'élaboration. Procédé pour l'obtention d'un demi-produit sidérurgique, caractérisé en ce que: - on élabore en poche un acier liquide dont les teneurs en C, Mn, Si, Al, P, S, Cu, Cr, Ni, Mo, W, Co, Ti, Nb, V, Zr, Sn, Sb, As, B et N sont comme précédemment, et dont on maintient la teneur en oxygène dissous entre 0,0050 et 0,0500% grâce à l'établissement d'un équilibre chimique entre le métal et le laitier de poche; - et on coule ledit acier sur une machine de coulée continue.

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