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This study investigates the hydrogenHydrogen-induced cracking (HICHydrogen-Induced Cracking (HIC)) behavior of Q345R pressure vessel steelSteel in a wet H2S environment, aiming of elucidating the microscopic mechanisms of crackCrack initiation and propagation and providing improvement strategies for enhancing its HICHydrogen-Induced Cracking (HIC) resistance. HydrogenHydrogen-induced cracking tests were conducted in accordance with the NACE TM0284 standard, indicating that HICHydrogen-Induced Cracking (HIC) cracksCrack are predominantly concentrated in the mid-thickness region of the steelSteel plate. MicrostructureMicrostructure observations reveal that cracksCrack propagate along martensite bandsMartensite bands, and MnS inclusionsMnS inclusions are present in the fractureFracture origin region. These MnS inclusionsMnS inclusions act as potent hydrogenHydrogen traps and crackCrack initiation sites, promoting microcrack formation, after which cracksCrack extend along the brittle martensite bandsMartensite bands following a low-energy pathway. The clustering of both MnS and martensiteMartensite in the central region is attributed to centerline segregationCenterline segregation in the casting slabs, which alters thermodynamicThermodynamic precipitationPrecipitation conditions and increases local hardenability. Industrial trials demonstrate that effective approaches to improve the HICHydrogen-Induced Cracking (HIC) resistance of Q345R steelQ345R steel include reducing sulfur contentSulfur content, implementing calcium treatment, and optimizing soft reductionReduction and hot-rolling cooling processesProcess to alleviate centerline segregationCenterline segregation.

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Effect of Martensite Band and MnS Inclusions on Hydrogen-Induced Cracking of Q345R Steel

  • 会议论文

  • 发表日期：

    2026年

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  • Fei-fei Yang,
  • Hao Geng,
  • Guobiao Di,
  • Shaopo Li,
  • Ruihao Li,
  • Yanqiu Fan

摘要

This study investigates the hydrogenHydrogen-induced cracking (HICHydrogen-Induced Cracking (HIC)) behavior of Q345R pressure vessel steelSteel in a wet H2S environment, aiming of elucidating the microscopic mechanisms of crackCrack initiation and propagation and providing improvement strategies for enhancing its HICHydrogen-Induced Cracking (HIC) resistance. HydrogenHydrogen-induced cracking tests were conducted in accordance with the NACE TM0284 standard, indicating that HICHydrogen-Induced Cracking (HIC) cracksCrack are predominantly concentrated in the mid-thickness region of the steelSteel plate. MicrostructureMicrostructure observations reveal that cracksCrack propagate along martensite bandsMartensite bands, and MnS inclusionsMnS inclusions are present in the fractureFracture origin region. These MnS inclusionsMnS inclusions act as potent hydrogenHydrogen traps and crackCrack initiation sites, promoting microcrack formation, after which cracksCrack extend along the brittle martensite bandsMartensite bands following a low-energy pathway. The clustering of both MnS and martensiteMartensite in the central region is attributed to centerline segregationCenterline segregation in the casting slabs, which alters thermodynamicThermodynamic precipitationPrecipitation conditions and increases local hardenability. Industrial trials demonstrate that effective approaches to improve the HICHydrogen-Induced Cracking (HIC) resistance of Q345R steelQ345R steel include reducing sulfur contentSulfur content, implementing calcium treatment, and optimizing soft reductionReduction and hot-rolling cooling processesProcess to alleviate centerline segregationCenterline segregation.