Development of Steels Resistant to Hydrogen Induced Cracking in Wet Hydrogen Sulfide Environment

作者：Y. Nakai, Hayao KURAHASHI, Toshihiko Emi, Osamu Haida · 发表于：Transactions of the Iron and Steel Institute of Japan · 年份：1979 · 被引用次数：36 · 研究领域：Material Properties and Failure Mechanisms、Fatigue and fracture mechanics、Engineering Diagnostics and Reliability

Fa ctors illfluencing Ihe occurrencr oj Hydrogen Induced Crackillg (HIC) in sleel plates Jor lillepipe use have been illvestigated by mealls oj ultrasonic C-scanning oj plate specimens preliminarily immersed into sYllthetic .lenwa ter saturated with H ,S.The cracks were most Jrequently observed in the area corresponding to A-and V-segregates oj mother ingots , illitiating at elongated MnS illclusions {m d propagatillg along anomalous structure in which Mn alld P WfTe segregated.Th e rest area was rather insu.<ceptible to HIC.The occurrellce oj HIC in the Jormer area was slightly decreased but cOllld not be prevented even by decreasing average S content oj the I)lates as low as O.OOlwt % .The addition oj copt)er markedly reduced the rate oj hy drogell permeation, bllt hardly prevented the Jormatioll oj H IC. Hea t treatments to imlJTove Ihe solute segregation ill slabs or to make the structure ill plates homogelleous helped decreasing the susceptibility to HIC.The treatments , however, were impracticable Jor commercia l cOlltrol-rolied plates.All e./fective meallS to overcome these difficulties has beell Jound 10 strictly cOlltroliillg the ratio oj e/fective cerium or calcium to suljilr ill the melt (alomic ratio ~ 1 •. 1) alld preven ting the reoxidation 0/ Ihe two elements d,/Tillg Ihe teemillg oj the melt.Resulting I)lales which Jl/bjecled to COII-Irolled roliing hfl ve been highlv re.<istanl or lolall y in.