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HIGH TENSILE STRENGTH STEEL SHEET HAVING EXCELLENT BRITTLE CRACK GENERATION SUPPRESSION OR STOPPING PROPERTY AND LOW TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONE
HIGH TENSILE STRENGTH STEEL SHEET HAVING EXCELLENT BRITTLE CRACK GENERATION SUPPRESSION OR STOPPING PROPERTY AND LOW TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONE
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机译:在受热影响区中具有出色的脆性裂纹产生抑制或停止性能以及低温韧性的高抗拉强度钢板
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摘要
PROBLEM TO BE SOLVED: To provide a high tensile strength steel sheet having excellent low temperature toughness in HAZ and a base metal and further having excellent brittle crack suppression or stopping properties in the base metal (steel member) even if high heat input welding is performed.;SOLUTION: In the steel sheet, a chemical componential composition is suitably controlled, and, when the metallic structure in a face parallel to the rolling direction of the steel sheet with a thickness t (mm) and vertical to the steel sheet surface is observed, the following conditions (a) to (c) are satisfied: (a) where the area ratio of ferrite is ≥75%; (b) the average equivalent circle diameter of the ferrite grains at a t/2 position is ≤20.0 μm; and (c) where the average aspect ratio of the ferrite grains at a t/4 position is ≤2.0.;COPYRIGHT: (C)2009,JPO&INPIT
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