About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
|
Advances in Ferrous Metallurgy
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Presentation Title |
Failure Investigation of Edger Roll Housing Bolts
in a Hot Strip Mill of an Integrated Steel Plant
|
Author(s) |
Soumendu Monia, Piyas Palit, Hari Om Bairwa, Prabhash Gokarn, Anup Kumar |
On-Site Speaker (Planned) |
Soumendu Monia |
Abstract Scope |
Bolt failures are a major concern in the manufacturing industry as they adversely affect mill productivity. The present study talks about failure of housing bolts of edger roll in a hot strip mill of an integrated steel plant. Root cause failure analysis was carried out using destructive metallography techniques. Six bolts fractured into three pieces; one from shank and head interphase and another from middle of shank portion where end plate and roll neck were connected. Bolt thread was found damaged at the shank portion. All the fracture surfaces of bolts indicated shear failure in overload except one bolt. That one bolt revealed signatures of fatigue arrest marks. Microstructural characterization of damaged thread location of bolt revealed severe deformation and grain flow. The analysis revealed that initial fracture took place in fatigue mode from the roll neck end plate connection followed by fracture of other bolts in overloading. |