Measurement of the Size Distribution of Nonmetallic Inclusions in Steel

Allhough several lIlelhods are available Jor determining Ihe flarlicle size distribution oj nonmelallic inclusions in sleel, Ihey are not so salisJaclory Jor fnecise measuremenls.A particle size ana{yzer named Coulter Counler is ajJjJlied with a hOfJe Ihat it may measure not on{y the f1recise size but the absolule number oj nonmetallic inclusions in sleel .AJ ler a series oj experimenlal works, it has been Jound Ihal the Coulter Counler was suitable J or Ihis /)UrjlOse.The Coulter Counler has Ihe Jollowing remarkable advantages in measuring the f)article size distribution oj nonmetallic ine/l/sions in sleel.(1 ) il Jeasurement is ca,,"ied out automatical{y.( 2) Not on{y Ihe size of inclusions but their number in a unit volume oj specimen can be measured simuitaneous{Y, and IhereJore Ihe concentration q[ inclusioJls call be determined .( 3) Gn{y very small amount oJine/usiolls, i.e ., 0.1 to I mg, is enol/gh Jor precise measuremenls.