加工強化型980MPa級薄鋼板の電縫鋼管への適用
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番 号 表( ) 図( 6 ) (写真は図に含める) 刷り上り希望大きさ 80mm 幅 170mm 幅 執筆者名 仲子 武文
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The fracture toughness of the welded joints proved that the applied stress of 400 MPa does not initiate brittle fracture from a 30 mm long and 10 mm deep surface crack