油罐底板焊缝应力腐蚀开裂行为  

Stress Corrosion Cracking Behavior for Bottom Plate of Oil Tank

作　　者：刘涛[1] 张喜亮[1] 付全荣[1] 卢宝城[2] 

机构地区：[1]河北工程大学装备制造学院,河北邯郸056038 [2]河北钢铁集团邯钢公司能源中心,河北邯郸056015

出　　处：《广东化工》2013年第16期194-196,共3页Guangdong Chemical Industry

摘　　要：通过对我国某国家石油储备基地的10万m3原油储罐SPV490Q钢焊缝在实际服役介质中应力腐蚀试验,并结合断口形貌分析以及能谱分析等手段,对大型原油储罐底板焊缝应力腐蚀开裂行为进行研究。试验与理论分析结果表明:SPV490Q焊缝在罐底水中会发生应力腐蚀开裂,其在服役环境下临界应力强度因子KISCC=38.61 MPam,应力腐蚀裂纹扩展速率为:da/dt=1.25×10-9m/s;氯离子的存在是导致SPV490Q钢焊缝在含氯高硫低的罐底水中的应力腐蚀的主要因素;罐底沉积水中溶解的氧也是促使致SPV490Q钢焊缝裂纹扩展的因素之一,在裂纹尖端,阴极发生吸氧腐蚀,容易形成Fe(OH)2,Fe(OH)3等腐蚀产物。The stress corrosion cracking behavior of SPV490Q weld used in 100000 m3 crude oil tank bottom of some National Oil Reserve Base of our country was researched by means of the stress corrosion tests, combining fracture appearance analysis and energy spectrum analysis in actual service medium. The experimental results and theoretical analysis showed that stress corrosion cracking of SPV490Q weld would occur in tank bottom sewerage medium, and the critical stress corrosion factors and the crack propagation rates of SPV490Q weld in practical service medium is 38.61 MPa√m and 1.25× 10-9 m/s, respectively. The chloride ion is the primary factor to cause stress corrosion for SPV490Q weld in the condition of tank bottom sewerage medium with much chlorine and little sulfur. Dissolved oxygen is another factor to promote crack propagation in SPV490Q weld, and corrosion products Fe（OHh, Fe（OH）3 would be formed in the crack tip because of the cathode oxygen corrosion.

关 键 词：SPV490Q焊缝 断口形貌 应力腐蚀开裂 大型储罐 

分 类 号：TE972[石油与天然气工程—石油机械设备]