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Q345qD桥梁板低温冲击性能不合格原因分析

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某公司生产的Q345qD桥梁板陆续出现低温冲击性能不合格的现象,不合格板主要集中在16 mm的厚度.通过对送检的不合格试样进行一系列分析检测,找出了 Q345qD钢板低温冲击性能不合格的主要原因是试样心部存在严重偏析,以及偏析带中存在贝氏体组织,同时,试样中存在的非金属夹杂物也影响了板材的低温冲击性能,对此提出了相应的改进措施.
Cause analysis of unqualified low-temperature impact performance of Q345qD bridge slab
The unsatisfactory low-temperature impact performance of Q345qD bridge slabs produced by one company was observed successively.The unqualified slabs were mainly concentrated in the thickness of 16 mm.Through a series of anal-ysis and testing on the unqualified samples submitted for inspection,the main reasons for the unqualified low-temperature impact performance of Q345qD steel plate were identified,i.e.,the severe segregation in the center of the sample as well as the presence of bainite structure in the segregation zone.At the same time,the nonmetallic inclusions in the sample also affected the low-temperature impact performance of the plate.The corresponding improvement measures were also proposed.

Q345qDlow temperature impact performancetissue segregationbainiteinclusion

邱健兴

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福建三钢闽光股份有限责任公司,福建三明 365000

Q345qD 低温冲击性能 组织偏析 贝氏体 夹杂物

2024

物理测试
中国钢研科技集团有限公司

物理测试

影响因子:0.363
ISSN:1001-0777
年,卷(期):2024.42(6)