Abstract：The macrostructure and microstructure of 430 ferritic stainless steel slab were studied by means of optical microscopy (OM).The phase was analyzed by means of X-ray diffraction (XRD) and differential scanning calorimetry-thermogravimetric(DSC-TG) tests ,and the element distribution was determined by electron microprobe (EPMA). The results show that phase transformation of ferrite and austenite happened in the heating process of 430 ferritic stainless steel specimens; XRD patterns of 430 ferritic stainless steel slab was α phase with body-centered cubic; macrostructure of 430 ferritic stainless steel slab was composed of columnar grains and equiaxial crystal grains; microstructure of 430 ferritic stainless steel slab was composed of ferrite matrix and martensite with shape of long strip and block,and the composition segregation was existing; the mass fraction of martensite in the area of the columnar crystal was 30％,while the mass fraction of martensite in the area of the equiaxial crystal was 14％.
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