CAJ | 학술논문

NK-HITEN610U2钢板已在我国用于液态烃球罐,由于液体烃中常含有水分和硫化氢,该材料在湿硫化氢环境中的耐蚀特性尚不明确.对采用回火焊道的焊接接头,经恒负荷拉伸、恒应变、焊接约束试板、氢诱导开裂、断裂韧性等试验和断口分析,对该钢板及其焊接接头在湿硫化氢环境中的抗H2S应力腐蚀开裂(SSC)性能进行了系统研究.发现其因母材中存在夹杂物偏析而对氢诱导裂纹(HIC)敏感,未经热处理的焊接接头,临界开裂应力指数Sc值小于10,材料在H2S介质中的临界应力强度因子KISCC值38 MPa·m-1/2,对SSC有一定的敏感性,认为用该材料在湿硫化氢环境中存在发生SSC的危险.据此,提出了球罐的检验和监控措施.
NK-HITEN610U2강판이재아국용우액태경구관,유우액체경중상함유수분화류화경,해재료재습류화경배경중적내식특성상불명학.대채용회화한도적한접접두,경항부하랍신、항응변、한접약속시판、경유도개렬、단렬인성등시험화단구분석,대해강판급기한접접두재습류화경배경중적항H2S응력부식개렬(SSC)성능진행료계통연구.발현기인모재중존재협잡물편석이대경유도렬문(HIC)민감,미경열처리적한접접두,림계개렬응력지수Sc치소우10,재료재H2S개질중적림계응력강도인자KISCC치38 MPa·m-1/2,대SSC유일정적민감성,인위용해재료재습류화경배경중존재발생SSC적위험.거차,제출료구관적검험화감공조시.
Though NK-HITEN610U2 steel plate has been used to fabricate spherical tank for liquid hydrocarbons, lit-tle is available about its anticorrosion behavior in liquid hydrocar-bons containing moisture and H2S. Thus the H2S stress cracking (SSC) behavior of the steel plate and its tempering welded joint in wet-H2S atmosphere were investigated by making use of uniax-ial tensile test, bent-beam test, welding of confined plate, hydro-gen-induced cracking (HIE) test, and analysis of fracture tough-ness and fractured sections. And the inspection and monitoring measurements for the spherical tank were suggested in relation to SSC. Results show that the sample was sensitive to HIC owing to the segregation of inclusions in the plate. The welding joint before heat-treatment had an Sc of less than 10 and a KISCC of 38 MPa · m-1/2, indicating that it was somewhat sensitive to SSC in wet- H2S environment.