关键词: 低碳合金钢复合板, 淬火分层开裂, 夹杂物, 界面

Abstract:  The 150 mm thick steel cladding plate is rolled by two block 365 mm cladding bloom, the delamination crack at 1/2 thickness of quenched-tempered cladding plate occurs when cutting four sides by flame. Analysis results show that quenching delamination crack is induced by the inclusions in central cladding interface together with the quenching stress. When the cladding bloom welding vacuum decreases from 5 x 10^-2 Pa to 1 x 10 ^-2 Pa,the cladding plate is not found inclusions in cladding interface and the delamination crack at 1/2 thickness cladding plate does not occur.