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- W2378807029 abstract "The pits occurred on the surface while high strength bolt was produced by using SWRCH35K cold heading wire rod.The microstructure of diameter 12 mm wire rod is ferrite and pearlite.Grain size of ferrite is grade 8.5,there isn't obvious decarburized layer.It was drawn diameter 11.15 mm after 765 ℃ annealing and pickling.Pits occurred on the surface,microstructure is ferrite and pearlite,ferrite grain size is grade 9,complete decarburization depth is 0.36 mm occurred on edge.Analysis shows that the annealing temperature is high and heating time is too long,grain size growing caused plastic deformation uneven,next cold drawn deformation amount is small,coarse grain on the surface inherit to next procedure,the reason that strength of surface coarse grain is low causes pit.It is suggested that customers control wire rod quality after annealing,control grain size to assure the correct usage and processing of wire rod." @default.
- W2378807029 created "2016-06-24" @default.
- W2378807029 creator A5012340186 @default.
- W2378807029 date "2011-01-01" @default.
- W2378807029 modified "2023-09-28" @default.
- W2378807029 title "Cause analysis of cold heading bolt surface pit in production" @default.
- W2378807029 hasPublicationYear "2011" @default.
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