Observation of Three Dimensional Shape of Inclusions in Low-C Al-killed Steel by Scanning Electromicroscope

Abstract

The shapes of inclusions extracted from low-C Al-killed steel from the continuous casting process have been observed by the use of a scanning electromicroscope.
The results obtained are summarized as follows.
1) Shapes of inclusions in steel are classified into five groupes, that is, dentritic type, cloud-like type, dumpling-like type, block-like type and others.
2) The inclusion of dentritic type is a crystal, but ones of cloud-like type and dumpling-like type are coagulation-products of small particles.
The inclusions of block-like type are considered exogeneous ones.