The comprehensive performance of grate plates is determined by the material formula and manufacturing process, and the material adaptability, casting accuracy, and heat treatment process directly affect their high temperature resistance, wear resistance, corrosion resistance, and service life. Unlike ordinary mechanical castings, dedicated grate plates for garbage incinerators need to adapt to extremely complex working conditions, with strict industry standards for material purity, structural accuracy, and mechanical properties.
In terms of material selection, grate plates are generally made of high chromium nickel alloy heat-resistant cast steel material, which is the optimal material for adapting to waste incineration conditions. Chromium can form a dense oxide protective film on the surface of metals, effectively resisting high-temperature oxidation and acid alkali flue gas corrosion, and preventing surface corrosion and peeling; Nickel element can enhance the high-temperature toughness and thermal stability of metals, significantly reduce the risk of thermal fatigue cracking, and adapt to the frequent fluctuations in furnace temperature. A reasonable alloy ratio can balance hardness and toughness, ensuring wear and erosion resistance of the plate surface while avoiding brittle fracture.
Conventional ordinary carbon steel materials cannot meet the requirements of incineration conditions. They are prone to rapid oxidation, corrosion, and wear in high temperature environments, and have a very short service life. They are only suitable for low temperature and light load conditions. High quality heat-resistant alloy grate plates can operate stably in high-temperature corrosive environments for a long time, with the advantages of strong load adaptability, low deformation rate, and strong impact resistance. They can adapt to various incineration materials such as urban and rural household waste and industrial solid waste.
Manufacturing process is the core link to ensure the quality of grate plates. High quality grate plates are produced using precision wax loss casting technology, forming a seamless integrated product with high dimensional accuracy and good surface smoothness. This ensures a tight fit and smooth sliding of the dynamic and static grate plates, avoiding operational stagnation, air and slag leakage. Strictly control the melting temperature and pouring speed during the casting process, eliminate internal defects such as porosity, sand holes, and shrinkage, and ensure the overall structure is uniform and stable under stress.
The subsequent heat treatment process is also crucial. Through a combination of normalizing and tempering heat treatment, the metal grains are refined, casting internal stresses are eliminated, and the high-temperature strength and fatigue resistance of the grate plate are improved, effectively avoiding deformation and cracking problems during long-term operation. Before leaving the factory, strict quality inspection processes such as size testing, hardness testing, and non-destructive testing must be carried out to ensure that the performance of each grate piece meets the standards. Scientific material selection and precision manufacturing processes are the core guarantees for the stable service of grate plates and the reduction of equipment maintenance costs.
