CAJ | 학술논문

针对某公司乙二醇装置R－110/R－120环氧乙烷反应器在含磷酸钠锅炉水中出现的应力腐蚀裂纹问题，通过楔形张开加载（WOL）预裂纹试样应力腐蚀试验和慢应变速率试验，研究SA543钢在含Na3 PO4锅炉水和改进后含（NH4）3 PO4锅炉水中的应力腐蚀开裂行为。楔形张开加载预裂纹试样应力腐蚀试验结果表明，SA543钢在100℃的锅炉水中应力腐蚀裂纹扩展速率几乎为零；慢应变速率试验发现SA543钢在260℃下含Na3 PO4的锅炉水环境中的应力腐蚀敏感性指数较大，有应力腐蚀倾向；而在含（NH4）3 PO4锅炉水中的应力腐蚀敏感性指数均小于25％，没有应力腐蚀倾向。说明在改进后的高温锅炉水中，SA543钢应力腐蚀裂纹萌生和扩展的抗力明显增强，为环氧乙烷反应器缺陷的安全评定提供了数据支撑。
침대모공사을이순장치R－110/R－120배양을완반응기재함린산납과로수중출현적응력부식렬문문제，통과설형장개가재（WOL）예렬문시양응력부식시험화만응변속솔시험，연구SA543강재함Na3 PO4과로수화개진후함（NH4）3 PO4과로수중적응력부식개렬행위。설형장개가재예렬문시양응력부식시험결과표명，SA543강재100℃적과로수중응력부식렬문확전속솔궤호위령；만응변속솔시험발현SA543강재260℃하함Na3 PO4적과로수배경중적응력부식민감성지수교대，유응력부식경향；이재함（NH4）3 PO4과로수중적응력부식민감성지수균소우25％，몰유응력부식경향。설명재개진후적고온과로수중，SA543강응력부식렬문맹생화확전적항력명현증강，위배양을완반응기결함적안전평정제공료수거지탱。
To solve the stress corrosion crack (SCC) problem of Ethylene Oxide (EO) reactors in the boiler feed water containing Na 3 PO4 of a company,the stress corrosion cracking of SA543 steel in the boil-er feed water containing Na 3 PO4 and improved boiler feed water containing (NH4 ) 3 PO4 were investigated by using stress corrosion tests with pre -cracked wedge-open loading (WOL) specimens and slow strain rate tests (SSRT).The results of WOL tests show that the stress corrosion crack growth rate of SA 543 steel is nearly zero in the improved boiler feed water at 100 ℃;the SSRT tests find that sensitivity index of SA543 steel to stress corrosion at the 260 ℃ boiler feed water containing Na 3 PO4 is comparatively high,which has certain stress corrosion tendency;while the sensitivities indexes of SA543 steel in the boil-er feed water containing (NH4 )3 PO4 are slightly lower than 25% without stress corrosion tendency .The experimental results implies the resistance to SCC initiation and propagation of SA 543 steel significantly increases in the improved boiler feed water,which provide some technical supports for safety assessment of Ethylene Oxide reactors.