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US09255305B2 High-strength steel sheet having superior toughness at cryogenic temperatures, and method for manufacturing same 有权
在低温下具有优异韧性的高强度钢板及其制造方法

High-strength steel sheet having superior toughness at cryogenic temperatures, and method for manufacturing same
Abstract:
According to one aspect, provided is a high-strength steel sheet having superior toughness at cryogenic temperature, comprising, in weight percentage, 0.02 to 0.06% of C, 0.1 to 0.35% of Si, 1.0 to 1.6% of Mn, 0.02% or less (but not 0%) of Al, 0.7 to 2.0% of Ni, 0.4 to 0.9% of Cu, 0.003 to 0.015% of Ti, 0.003 to 0.02% of Nb, 0.01% or less of P, 0.005% or less of S, the remainder being Fe and unavoidable impurities, wherein the high-strength steel sheet satisfies the condition of [Mn]+5.4[Si]+26[Al]+32.8[Nb]
Abstract(Chinese):

一方面，提供一种在低温下具有优异的韧性的高强度钢板，其重量百分比为C：0.02〜0.06％，Si：0.1〜0.35％，Mn：1.0〜1.6％，0.02％ 较少（但不是0％）的Al，0.7〜2.0％的Ni，0.4〜0.9％的Cu，0.003〜0.015％的Ti，0.003〜0.02％的Nb，0.01％以下的P，0.005％以下的 S，其余为Fe和不可避免的杂质，其中高强度钢板满足[Mn] +5.4 [Si] +26 [Al] +32.8 [Nb] <4.3的条件，其中[Mn]，[Si] [Al]，[Nb]分别表示Mn，Si，Al，Nb的含量。 当用作船舶，海上结构等的结构钢材料时，钢板确保韧性，或者在暴露于极端低温环境下用于储存和运送液化气体的罐的钢材。

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