C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/42 (2006.01) C21C 5/00 (2006.01) C21C 7/04 (2006.01) C21C 7/06 (2006.01) C21C 7/10 (2006.01) C22C 38/00 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2367224
A new austenitic stainless steel contains 0.1-1.0 mass % of Si and not more than 0.003 mass % of Al. Nonmetallic inclusion dispersed in a steel matrix is converted to MnO-SiO2-Al2O3 containing not less than 15 mass % of SiO2 and not more than 40 mass % of Al2O3. During steel making, molten steel is covered with basic slag and strongly deoxidized with a Si alloy whose Al content is controlled not more than 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without occurrence of cracking due to its less crack-sensitivity and good formability.
Nouvel acier austénitique renfermant 0,1 à 1,0 % en masse de S, et au plus 0,003 % en masse d'Al. Une inclusion non métallique dispersée dans une matrice d'acier est convertie en MnO-SiO2-Al2O3 renfermant pas moins de 15 % en masse de SiO2 et pas plus de 40 % en masse d'Al2O3. Pendant la fabrication de l'acier, l'acier en fusion est recouvert d'une scorie basique et fortement désoxydé avec un alliage de Si dont la teneur en Al est maintenue à au plus 1,0 % en masse sous vide ou sous une atmosphère non oxydante. La feuille d'acier inoxydable austénitique peut être modelée en une forme quelconque sans se craqueler, cela vu sa résistance particulière au craquelage et sa bonne formabilité.
Hiramatsu Naoto
Iida Teruyoshi
Katsuki Junichi
Suzuki Satoshi
Yamauchi Takashi
Nisshin Steel Co. Ltd.
Ridout & Maybee Llp
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