ANALYSIS FOR CAUSE OF CRACKS IN HAZ OF X52 ERW PIPELINE
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摘要: 采用金相显微镜和扫描电镜检验X52试验钢焊管裂纹断口和夹杂物形貌,并对夹杂物进行微区成分分析,确定了钢中存在大量密集分布的稀土硫化物和稀土硫氧化物层带状夹杂是形成裂纹的主要原因,层带状夹杂物在高温和焊接挤压力的作用下内部分离而产生裂纹。Abstract: Adopting metalloscope and SEM to inspect the fracture and inclusions in the cracks of X52 experimental-welded-pipe steel,the composition of the inclusions was analyzed.The results show that the mass dense RE-sulphide and RE-sulphide-oxide laminated zonal inclusions are the main causes of the cracks. With high temperature and welding pressure,the severance of inclusions forms crack.
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Key words:
- pipeline steel /
- ERW /
- crack /
- rare-earth inclusion
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