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And a method of manufacturing the same circumferential weld joints in the pipeline for high-strength steel with excellent resistance to low cycle fatigue properties
And a method of manufacturing the same circumferential weld joints in the pipeline for high-strength steel with excellent resistance to low cycle fatigue properties
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机译:以及在管道中制造具有相同的低周疲劳性能的高强度钢相同圆周焊缝的方法
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摘要
PROBLEM TO BE SOLVED: To provide a circumferential weld joint of a high strength steel pipe for a pipeline suppressing deterioration of low cycle fatigue resistance, preventing a fatigue crack, and excellent in low cycle fatigue resistance.;SOLUTION: A weld metal part 21 of a circumferential weld part 20 includes a lower weld metal 21A positioned on a steel pipe inner surface side and an upper weld metal 21B positioned on a steel pipe outer surface side. The relationship among the Vickers hardness Hv (BM) of a base material, the Vickers hardness Hv (WM1) of the lower weld metal 21A, and the Vickers hardness Hv (WM2) of the upper weld metal 21B satisfies the following formula, {Hv(WM1)≤0.8Hv(BM)}, or the following formula, {Hv(WM2)≥Hv(BM)}. The relationship between a longitudinal cross sectional area S (WM1) of the lower weld metal 21A and a longitudinal cross sectional area S (WM1+WM2) of the whole of the weld metal part 21 satisfies the following formula, {0.4≤S(WM1)/S(WM1+WM2)≤0.6}.;COPYRIGHT: (C)2012,JPO&INPIT
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