C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C21D 9/46 (2006.01) C22C 38/48 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2546003
Disclosed is a high-rigidity high-strength thin steel sheet having a tensile strength of not less than 590 MPa and a Young's modulus of not less than 225 GPa at the same time. The high-rigidity high-strength thin steel sheet has a composition consisting of, in mass%, C:0.02-0.15%, Si: 1.5% or less, Mn: 1.5- 4.0%, P: 0.05% or less, S: 0.01% or less, Al: 1.5% or less, N: 0.01% or less, Nb: 0.02-0.40%, and the balance of iron and unavoidable impurities, wherein the C, N and Nb contents satisfy the following relations: 0.01 <= C + (12/14) × N - (12/92.9) × Nb <= 0.06 and N <= (14/92.9) × (Nb - 0.01). The structure of such a steel sheet has a main phase composed of a ferrite phase, and contains not less than 1% of a martensite phase in the area ratio as a second phase.
Il est prévu une feuille mince d'acier haute rigidité haute résistance ayant une résistance de rupture à la traction supérieure ou égale à 590 Mpa et un module de Young supérieur ou égal à 225 GPa dans le même temps. La feuille mince d'acier haute rigidité haute résistance a la composition suivante, en pourcentage de masse, C:0,02-0,15%, Si: 1,5% ou moins, Mn: 1,5-4,0%, P: 0,05% ou moins, S: 0,01% ou moins, Al: 1,5% ou moins, N: 0,01% ou moins, Nb: 0,02-0,40%, et le solde étant constitué de fer et des inévitables impuretés, où les teneurs en C, N et Nb satisfont aux relations suivantes : 0,01 <= C + (12/14) × N - (12/92,9) × Nb <= 0,06 et N <= (14/92,9) × (Nb - 0,01). La structure d~une telle feuille d~acier a une phase principale composée d~une phase ferrite, et contient au moins 1 % d~une phase martensite dans le rapport de surface comme seconde phase.
Hosoya Yoshihiro
Kizu Taro
Okuda Kaneharu
Urabe Toshiaki
Yoshida Hiromi
Jfe Steel Corporation
Robic
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