1Cr20Ni14Si2 stainless steel anti-wear pad was corroded or even fractured in the operation of water gas waste heat boiler. In this paper, we study the fracture failure of stainless steel anti-wear tile in vertical waste heat boiler with positive pressure water gas. X-ray diffractometer (XRD), scanning electron microscope (SEM) and electronic energy spectrum analyzer (EDS) equipment are used to test the corrosion brown powder on the surface of 1Cr20Ni14Si2 stainless steel, the composition of stainless steel surface and artificial section. XRD results show that the brown powder contains several oxides and sulfides.EDS results show that the surface of stainless steel contains a lot of S and O. This shows that 1Cr20Ni14Si2 stainless steel is easily corroded by S in the coking furnace and loses the characteristics of stainless steel. EDS results show that the Ni content of stainless steel is obviously lower than the national standard, which reduces the toughness of stainless steel and accelerates corrosion. S, C and O in the flue gas enter into the material through corrosion pores to accelerate the internal corrosion of stainless steel. The research results can be used to guide the selection and optimization of anti-wear tile materials for water gas waste heat boilers.