石油化工腐蚀与防护
石油化工腐蝕與防護
석유화공부식여방호
PETROCHEMICAL CORROSION AND PROTECTION
2011年
2期
52-56
,共5页
腐蚀疲劳裂纹%应力腐蚀裂纹%固溶处理%稳定化处理%焊后热处理
腐蝕疲勞裂紋%應力腐蝕裂紋%固溶處理%穩定化處理%銲後熱處理
부식피로렬문%응력부식렬문%고용처리%은정화처리%한후열처리
corrosion fatigue cracking%stress corrosion cracking%solution heat treatment%stabilization treatment%post weld heattreatment
某石化公司在2009年装置检修中发现15台高温换热器的所有接管法兰存在大量长短不等的径向裂纹。经检测发现裂纹分为两种：一种是腐蚀疲劳裂纹；一种是应力腐蚀裂纹。这二种裂纹的性质都属于环境敏感开裂。开裂法兰的化学成分中Cr，Ni和Ti的质量分数低于JB4728—2000《压力容器用不锈铜锻件标准》的下限，同时交货状态下没有固溶处理。针对产生环境敏感开裂的原因．提出了相应的预防措施．
某石化公司在2009年裝置檢脩中髮現15檯高溫換熱器的所有接管法蘭存在大量長短不等的徑嚮裂紋。經檢測髮現裂紋分為兩種：一種是腐蝕疲勞裂紋；一種是應力腐蝕裂紋。這二種裂紋的性質都屬于環境敏感開裂。開裂法蘭的化學成分中Cr，Ni和Ti的質量分數低于JB4728—2000《壓力容器用不鏽銅鍛件標準》的下限，同時交貨狀態下沒有固溶處理。針對產生環境敏感開裂的原因．提齣瞭相應的預防措施．
모석화공사재2009년장치검수중발현15태고온환열기적소유접관법란존재대량장단불등적경향렬문。경검측발현렬문분위량충：일충시부식피로렬문；일충시응력부식렬문。저이충렬문적성질도속우배경민감개렬。개렬법란적화학성분중Cr，Ni화Ti적질량분수저우JB4728—2000《압력용기용불수동단건표준》적하한，동시교화상태하몰유고용처리。침대산생배경민감개렬적원인．제출료상응적예방조시．
A large number of crackings of different lengths were found on the flanges of 15 heat exchangers in atmospheric-vacuum distillation unit in the turnaround, 2009. The testing concluded that the crackings were divided into two types： corrosion fatigue cracking and stress corrosion cracking, which are environmental-sensitive crackings. The Cr, Ni and Ti in the cracked flanges were lower than the lower limit of specifications in JB4728-2000 ＂Standards of Stainless Steel Forgings for Pressure Vessels＂, and the flanges had not been treated by solution heat treatment before delivery. Corresponding prevention measures are recommended based upon the cause analysis.
