Facing the constraints of the "dual carbon" goals, the casting manhole cover industry is accelerating its low-carbon transformation. Technologies such as the replacement of traditional blast furnaces with medium-frequency induction furnaces and the recycling of scrap iron resources are widely applied. Currently, the industry's electric furnace smelting penetration rate has reached 61%, and the average utilization rate of scrap steel has increased to 92%. Leading enterprises have reduced the energy consumption per casting by 22% through low-carbon smelting processes, and their carbon footprint has decreased by 28% compared to traditional methods. Additionally, a "manufacturing - service - recycling" closed-loop system is gradually taking shape. Through digital twin technology, the first-pass yield of products has been raised to 96.8%. The high-purity reuse technology of recycled molten iron further reduces the reliance on raw materials. Many enterprises have gained ESG rating bonuses by virtue of their green production systems, thus gaining a competitive edge in municipal procurement.