we bought SSCC bar more than 3 venders, but results is same like material all are carbon steel only showing, hardness 160 185HB, material composition, Fe 99.07, Mn 0.65, Cu 0.165, Cr 0.114,Pb 0.37, Mo 0.007. Hardness 165 to 185HB.,
SSCC scraper bars are frequently wearing out because the material supplied by different vendors is essentially ordinary carbon steel rather than a genuinely abrasion-resistant alloy. Laboratory analysis of samples procured from multiple vendors showed nearly identical chemical composition—approximately 99.07% iron, 0.65% manganese, 0.165% copper, 0.114% chromium, and 0.007% molybdenum—with hardness ranging from only 165 to 185 HB. This hardness level is close to that of medium carbon steel and is far below the hardness typically required for severe abrasive applications in the Ash Handling Plant.
In the submerged scraper conveyor (SSC), the scraper bars are continuously exposed to highly abrasive bottom ash and clinker particles. Since the supplied bars have relatively low hardness and minimal alloying elements, they do not possess sufficient wear resistance to withstand this service condition. As a result, the bars experience rapid erosion and require frequent replacement.
Therefore, the root cause of repeated wear is that all vendors are supplying material with similar low hardness and carbon-steel characteristics. To improve service life, the procurement specification should require certified abrasion-resistant bars with hardness above 400 HB, along with supporting Mill Test Certificates and hardness test reports.
