High-tensile-strength steel and method of manufacturing the...

Details High-tensile-strength steel and method of manufacturing the... High-tensile-strength steel and method of manufacturing the...

C - Chemistry, Metallurgy

21

D

C21D 8/02 (2006.01) C22C 38/04 (2006.01) C22C 38/08 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C22C 38/16 (2006.01) C22C 38/18 (2006.01) C22C 38/48 (2006.01) C22C 38/50 (2006.01)

Patent

CA 2280923

A high-tensile-strength steel having excellent toughness throughout its thickness, excellent properties at welding joints, and a tensile strength (TS) of at least about 900 Mpa (130 ksi), and a method for making such steel, are provided. Steels according to this invention preferably having the following composition based on % by weight: carbon (C): 0.02 % to 0.1 % ; silicon (Si): not greater than 0.6 %; manganese (Mn): 0.2 % to less than 1.7 %; nickel (Ni): 0.2 % to 1.2 %; niobium (Nb): 0.01 % to 0.1 %; titanium (Ti): 0.005 % to 0.03 %; aluminum (Al): not greater than 0.1 %; nitrogen (N): 0.001 % to 0.006 %; copper (Cu): 0 % to 0.6 %; chromium (Cr): 0 % to 0.8 %; molybdenum (Mo): 0 % to 0.6 %; vanadium (V): 0 % to 0.1 %; boron (B): 0 % to 0.0025 %; and calcium (Ca): 0 % to 0.006 %. The value of Vs as defined by Vs = C + (Mn/5) + SP - (Ni/10) - (Mo/15) + (Cu/10) is 0.15 to 0.42. P and S among impurities are contained in an amount of not greater than 0.015 % and not greater than 0.003 %, respectively. The carbide size in the steel is not greater than 5 microns in the longitudinal direction.

L'invention, qui a trait à un acier à résistance élevée à la rupture, d'une ténacité excellente sur toute son épaisseur, doté de propriétés remarquables aux joints de soudure et d'une résistance à la rupture (TS) d'au moins 900 Mpa environ, concerne également un procédé de production dudit acier. La composition de l'acier de l'invention est, de préférence, la suivante, en pourcentage pondéral: carbone (C), de 0,02 à 0,1 %, silicium (S), pas plus de 0,6 %, manganèse (Mn), de 0,2 à 2,5 %, nickel (Ni), de 0,2 à 1,2 %, niobium (Nb), de 0,01 à 0,1 %, titane (Ti), de 0,005 à 0,03 %, aluminium (Al), pas plus de 0,1 %, azote (N), de 0,001 à 0,006 %, cuivre (Cu) de 0 à 0,6 %, chrome (Cr), de 0 à 0,8 %, molybdène (Mo), de 0 à 0,6 %, vanadium (V), de 0 à 0,1 %, bore (B), de 0 à 0,0025 % et calcium (Ca), de 0 à 0,006 %. La valeur de Vs telle que définie par Vs = C + (Mn/5) + 5P - (Ni/10) - (Mo/15) + (Cu/10) est comprise entre 0,15 et 0,42. Les quantités de phosphore (P) et de soufre (S), parmi les impuretés existantes, n'excèdent pas 0,015 % et 0,003 %, respectivement. la taille du carbure dans l'acier n'excède pas 5 microns dans le sens longitudinal.

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