C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/14 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2668069
A steel plate for linepipes having ultra-high strength and excellent low temperature toughness, and a method for manufacturing the same are disclosed. The steel plate has strength of 930 MPa or more and excellent toughness even with much smaller amounts of alloying elements than that of conventional steel plates, and a method for manufacturing the same. The steel comprises by weight %: 0.03 ~ 0.10% C; 0 ~ 0.6% Si; 1.6 - 2.1% Mn; 0 ~ 1.0% Cu; 0-1.0% Ni; 0.02-0.06% Nb; 0-0.1% V; 0.1-0.5% Mo; 0-1.0% Cr; 0.005-0.03% Ti; 0.01-0.06% Al; 0.0005 - 0.0025% B; 0.001 - 0.006% N; 0 - 0.006% Ca; 0.02% or less P; 0.005% or less S; and the balance of Fe and unavoidable impurities. The microstructure comprises at least about 75 area percent of a mixture of bainitic ferrite and acicular ferrite.
La présente invention concerne une plaque d'acier destinée à des tubes de canalisation ayant une résistance extrêmement élevée et une excellente résilience à basse température, ainsi qu'un procédé pour la réaliser. La plaque d'acier a une résistance d'au moins 930 MPa et une excellente résilience même avec des quantités d'éléments d'alliage beaucoup plus petites que celles des plaques d'aciers conventionnelles. L'acier comprend en poids : 0,03 ~ 0,10% C; 0 ~ 0,6% Si; 1,6 - 2,1% Mn; 0 ~ 1,0% Cu; 0-1,0% Ni; 0,02-0,06% Nb; 0-0,1% V; 0,1-0,5% Mo; 0-1,0% Cr; 0,005-0,03% Ti; 0,01-0,06% Al; 0,0005 - 0,0025% B; 0,001 - 0,006% N; 0 - 0,006% Ca; 0,02% ou moins de P; 0,005% ou moins de S; le reste étant Fe et des impuretés inévitables. La microstructure comprend au moins environ 75 pourcents en surface d'un mélange de ferrite bainitique et de ferrite aciculaire.
Ahn Seong Soo
Cho Sang Hyun
Yoo Jang Yong
Posco
Robic
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