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STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK PROPAGATION STOPPING CHARACTERISTIC AND FATIGUE CRACK PROPAGATION CHARACTERISTIC AFTER PLASTIC DEFORMATION AND MANUFACTURING METHOD THEREOF
STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK PROPAGATION STOPPING CHARACTERISTIC AND FATIGUE CRACK PROPAGATION CHARACTERISTIC AFTER PLASTIC DEFORMATION AND MANUFACTURING METHOD THEREOF
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机译:具有出色的脆性裂纹扩展停止特性和疲劳裂纹扩展特性的结构钢及其塑性变形后的制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a structural steel having excellent brittle crack propagation stopping characteristic and fatigue crack propagation characteristic even after receiving plastic deformation.;SOLUTION: A steel base material after heated is hot rolled under a condition, which is controlled to that the accumulation draft in a temperature range of 1000-900°C is ≥15%, and the accumulation draft in a temperature range of 900-725°C is ≥75%, and the rolling termination temperature is 850-725°C, and is cooled down to 400°C at 5°C/s cooling rate to form an aggregative texture, in which the X-ray intensity ratio in (211) plane of the rolled surface is ≥1.5 and is larger than the X-ray intensity ratio in (100) plane.;COPYRIGHT: (C)2002,JPO
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