High-strength steel sheet plated with zinc by hot dipping...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/38 (2006.01) C21D 9/46 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01) C22C 38/20 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C22C 38/40 (2006.01) C22C 38/58 (2006.01) C23C 2/40 (2006.01)

Patent

CA 2609240

A high-strength steel sheet plated with zinc by hot dipping which has excellent processability. It can be produced using a production line which includes zinc plating by hot dipping and in which a sufficient austempering time after annealing is not secured, without necessitating a special structural control as a pretreatment. The high-strength steel sheet plated with zinc by hot dipping contains 0.05-0.3 mass% carbon, up to 1.4 mass% (including 0 mass%) silicon, 0.08-3 mass% manganese, 0.003-0.1 mass% phosphorus, up to 0.07 mass% sulfur, 0.1-2.5 mass% aluminum, 0.1-0.5 mass% chromium, and up to 0.007 mass% nitrogen, provided that silicon + aluminum >= 0.5 mass%, with the remainder consisting of iron and unavoidable impurities. The steel sheet has a volume content of residual austenite of 3% or higher, and residual austenite grains have an average aspect ratio of 2.5 or lower.

L~invention concerne une feuille d~acier très résistante plaquée de zinc par galvanisation à chaud d~excellente formabilité. On peut l~obtenir à l~aide d~une chaîne de production englobant un placage de zinc par galvanisation à chaud et où un temps suffisant de trempe étagée bainitique sans recuit n~est pas garanti, sans exiger de contrôle structurel spécial comme prétraitement. La feuille d~acier très résistante plaquée de zinc par galvanisation à chaud contient de 0,05 à 0,3 % en masse de carbone, jusqu~à 1,4 % en masse de (y compris 0 % en masse de) silicium, de 0,08 à 3 % en masse de manganèse, de 0,003 à 0,1 % en masse de phosphore, jusqu~à 0,07 % en masse de soufre, de 0,1 à 2,5 % en masse d~aluminium, de 0,1 à 0.5 % en masse de chrome, et jusqu~à 0,007 % en masse d~azote, sous réserve que la somme de silicium + aluminium soit >= 0,5 % en masse, le reste consistant en fer et impuretés inévitables. La feuille d~acier possède une teneur en volume d~austénite résiduel supérieure ou égale à 3%, et les grains d~austénite résiduel ont un rapport d~allongement moyen inférieur ou égal à 2,5.

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