桥梁板厚度1/4处探伤不合原因分析及改进措施  

Reason Analysis and Improvement Measures for Nonconforming Flaw Detection at 1/4 Thickness of Bridge Plate

作　　者：陈建超 岳土民 陈浩 CHEN Jianchao;YUE Tumin;CHEN Hao(Hebei Puyang Iron and Steel Co.,Ltd.Technical Center,Handan 056305,China;Hebei Technological Innovation Center for Wear Resistant Steel Plate of High plasticity and High Toughness,Handan 056305,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]河北普阳钢铁有限公司技术中心,河北邯郸056305 [2]河北省高塑韧性耐磨钢板技术创新中心,河北邯郸056305 [3]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《山东冶金》2024年第5期16-18,共3页Shandong Metallurgy

摘　　要：针对20mm规格Q345qD桥梁钢板厚度1/4处出现的探伤不合格问题,对探伤缺陷位置精确定位并取样。通过金相显微镜和扫描电子显微镜等分析手段,发现钢板1/4处存在超长超粗的点链状含Al、Ca、Mg的氧化物,并伴随有氢致裂纹是造成钢板探伤不合的主要原因。根据分析结果,对桥梁钢的冶炼和连铸工艺提出避免精炼后期补铝线、保证软吹时间、减少中间包干式料脱落、降低钢中氢含量等改进措施,解决了探伤不合格问题,提高了桥梁钢板的探伤合格率。In response to the problem of unqualified flaw detection at a quarter thickness of the 20 mm thick Q345qD bridge steel plate,the location of the flaw detection defect was accurately located and sampled.Through analysis methods such as metallographic microscopy and scanning electron microscopy,it is found that the presence of ultra long and ultra coarse point chain oxides containing Al,Ca,and Mg at one quarter of the steel plate,accompanied by hydrogen induced cracks,is the main reason for the unsatisfactory detection of the steel plate.Based on the analysis results,improvement measures have been proposed for the smelting and continuous casting process of bridge steel,such as avoiding aluminum wire supplementation in the later refining stage,ensuring soft blowing time,reducing dry material detachment in the intermediate ladle,and reducing hydrogen content in the steel.These measures have solved the quality problem and increased the qualification rate of bridge steel plates inspection.

关 键 词：桥梁板 厚度1/4 探伤不合 B类夹杂物 软吹时间 

分 类 号：TG115.285[金属学及工艺—物理冶金]