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Analysis on Cracking Reason of 9Cr2Mo Steel High Frequency Welded Pipe Roller

Xuefeng Li

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Abstract

The cracking phenomenon was found in 9Cr2Mo steel high frequency welded pipe roller when cleaning after heat treatment.Through analysis by fracture appearance,metallographic structure,mechanical properties and etc,it found some round cracking original exist in the center of fracture surface close to inside surface,the content of Ni and H is high in roller material,much more inclusion,serious dendritic segregation,and low impact value of roller.The inspection results showed that the H content of 9Cr2Mo steel roller is high,which caused hydrogen induced crack,and then induced brittle fracture under the action of stress.

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What this paper is about

The cracking phenomenon was found in 9Cr2Mo steel high frequency welded pipe roller when cleaning after heat treatment.Through analysis by fracture appearance,metallographic structure,mechanical properties and etc,it found some round cracking original exist in the center of fracture surface close to inside surface,the content of Ni and H is high in roller material,much more inclusion,serious dendritic segregation,and low impact value of roller.The inspection results showed that the H content of 9Cr2Mo steel roller is high,which caused hydrogen induced crack,and then induced brittle fracture under the action of stress.

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Available abstract

The cracking phenomenon was found in 9Cr2Mo steel high frequency welded pipe roller when cleaning after heat treatment.Through analysis by fracture appearance,metallographic structure,mechanical properties and etc,it found some round cracking original exist in the center of fracture surface close to inside surface,the content of Ni and H is high in roller material,much more inclusion,serious dendritic segregation,and low impact value of roller.The inspection results showed that the H content of 9Cr2Mo steel roller is high,which caused hydrogen induced crack,and then induced brittle fracture under the action of stress.

Key concepts: Cracking, Materials science, Welding, Metallurgy, Brittleness, Fracture (geology), Composite material, Brittle fracture

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