Research On The Structure And Properties Of The Fe-Cr Heat-resistant Alloy

Lining board is one of the most important parts of Coke Dry Quenching tank, itsperformance and the cost has an important impact on the coke production. At present, thedomestic liner materials is not ideal in use process due to the defects in performance or cost,etc.In this paper, ferritic and austenitic matrix type heat-resistant steels were chosen as pilotstudy in order to get an ideal liner material.The results indicated that, the structure of30Cr7Si2V consisted of ferritic matrix, asmall amount of pearlite and a small amount of carbide; the structure of30Cr12Al4SiV con-sisted of ferrite, all alloy elements were dissolved in ferrite; the structure of60Cr18Si2Vconsisted of ferritic matrix, pearlite and carbide; the structure of30Cr18Ni3Mn5SiN consis-ted of austenite matrix.The oxide film of30Cr18Ni3Mn5SiN was Cr2O3, Fe3O4, MnO2and Mn2CrO4compo-site oxide, the alloy of30Cr12Al4SiV formed of Cr2O3, Al2O3, Fe2O3and SiO2compositeoxide film, the oxide film of two kinds of alloy was very smooth, oxide particles arrangeddense and uniform,.Hardness and strength of the alloy increases with the content of C,Cr,Mn,Ni. In fourkinds of alloy,30Cr18Ni3Mn5SiN had the highest hardness and tensile strength, valueswere266HBS and623MPa;30Cr12Al4SiV had a excellent wear resistance performance;the thermal shock resistance of30Cr18Ni3Mn5SiN was best. In the four kinds of alloy,increasing the content of Cr, Ni could improve effectively the high temperature strength andthermal shock performance of heat resistant steel.Comprehensive comparison of four kinds of alloy,30Cr18Ni3Mn5SiN which wasuniphase austenite was the best in high temperature strength, high temperature oxidationresistance, wear resistance and thermal shock performance.