Typical case analysis of crane hook breakage accident

2025-07-29 05:11:30

The following are 6 representative crane hook break accident case analyses, covering accident characteristics, failure mechanisms and industry lessons:


Case 1: High temperature fracture of metallurgical hook (a steel plant in 2021)

  • Accident characteristics :

    • The hook neck suddenly broke when lifting a 1580℃ molten steel ladle

    • The cross section is a rock candy-like brittle fracture

  • Failure analysis :

    • The strength of material 34CrMo decreases by 62% at 600℃

    • Brittleness caused by precipitation of σ phase at grain boundaries (confirmed by SEM)

  • lesson :

The following are 6 representative crane hook break accident case analyses, covering accident characteristics, failure mechanisms and industry lessons:


Case 1: High temperature fracture of metallurgical hook (a steel plant in 2021)

  • Accident characteristics :

    • The hook neck suddenly broke when lifting a 1580℃ molten steel ladle

    • The cross section is a rock candy-like brittle fracture

  • Failure analysis :

    • The strength of material 34CrMo decreases by 62% at 600℃

    • Brittleness caused by precipitation of σ phase at grain boundaries (confirmed by SEM)

  • lesson :

The following are 6 representative crane hook break accident case analyses, covering accident characteristics, failure mechanisms and industry lessons:


Case 1: High temperature fracture of metallurgical hook (a steel plant in 2021)

  • Accident characteristics :

    • The hook neck suddenly broke when lifting a 1580℃ molten steel ladle

    • The cross section is a rock candy-like brittle fracture

  • Failure analysis :

    • The strength of material 34CrMo decreases by 62% at 600℃

    • Brittleness caused by precipitation of σ phase at grain boundaries (confirmed by SEM)

  • lesson :

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