Features of grate bars:
1. Use MC type carbide reinforcement. After technical treatment, the hardness and high-temperature stability of the MC-type carbide formed in the alloy are better than those of M7C3 and M23C6 in traditional grate bar materials. With the modification treatment, the high-temperature strength and high-temperature wear resistance of the grate bar are better; in addition, On the one hand, MC-type carbides consume the C element in the alloy, allowing more chromium to enter the alloy matrix, further improving the oxidation resistance and high-temperature strength of the alloy.
2. Use rare earth and boron for modification treatment. After the modification treatment, the matrix and carbides are refined, the splitting effect of the carbides on the matrix is weakened, the grain boundaries are purified, and the oxidation resistance, impact toughness, high temperature strength and creep strength of the alloy are further improved.
3. Using the lost foam casting process, the appearance and intrinsic quality of the grate are superior to traditional sand casting.
Grate bar working environment:
1. Large temperature changes: During sintering, the temperature of the sinter can be as high as 1100°C, and the grate temperature is generally 800 to 1000°C; after unloading, the temperature quickly drops to 100-300°C in the air.
2. Gas corrosion: oxidation and corrosion of CO, CO2, SO2 and water vapor in the atmosphere.
3. High-temperature load-bearing: bear the gravity effect of sintered ore during high-temperature sintering.
4. Impact and friction wear of sinter: Impact and friction wear of sinter material during the loading and unloading process.
5. Scouring by high-temperature and high-speed powder-gas two-phase flow.
