Cleanliness analysis of SUS630 stainless steel made by Japan
This article conducts a cleanliness analysis on SUS630 stainless steel for two sensors produced by die casting in a Japanese steel plant.The results show that the inclusion types in SUS630 stainless steel bars are mainly oxides O-Al-Ca-Mg,and a small number of inclusions are O-Al-Ca-Mg-S.The main types of inclusions in SUS630 stainless steel plates are oxides O-Mg-Al-Si-Mn,and a small number of inclusions are O-Mn-Al-Si-Ti and O-Mn-Si-Al-Ca.The morphology of their inclusions is spherical or nearly spherical.The inclusion density,average equivalent diameter,and area ratio of the bar are 26/mm2,3.1 μm,and 0.024%respectively,and that of the plate are 29/mm2,2.3 μm,and 0.013%respectively.The inclusion rating results of the bar are B1.0 for fine series and D1.0 for fine series,and the inclusion rating results of the plate are B0.5 for fine series and D1.0 for fine series.The overall cleanliness control level of the two materials is relatively high.In addition,there are ultrafine Nb(C,N)inclusions in steel.
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