The 69-day Ansteel Steel Coking Plant No. 2 dry quenching overhaul project was successfully completed, and the total period made the shortest record in the like scale overhaul in the industry. It is understood that the dry quenching system overhaul project covered the dry extruding furnace maintenance, the boiler maintenance, and dust removal system, all at a synchronous pace. It was a ”reborn" type system transformation and solved more than 150 problems.