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Cause Analysis of Disqualification of Q345D-Z25 Steel Plate in Ultrasonic Inspection
Author(s): 
Pages: 34-37
Year: Issue:  5
Journal: Wide and Heavy Plate

Keyword:  中心裂纹夹杂物组织偏析无损探伤;
Abstract: 运用金相显微镜、扫描电镜等手段,对济钢生产的70 mm厚度规格Q345D-Z25钢板进行显微组织分析.结果表明,钢板中心存在的裂纹、MnS夹杂物以及组织偏析是造成此次钢板探伤不合的主要原因.通过提高钢水纯净度、铸坯以及钢板内部质量,探伤合格率得到显著提高.
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