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The distribution chute is an important component of the bell less top of a blast furnace, which is used to distribute coke, pellets, sintered ore, other minerals, and additives into the blast furnace in the best way possible. It plays a crucial role in the stable operation of the blast furnace. Due to the fact that the blast furnace material chute is located at the top of the blast furnace chamber and operates in a high temperature of around 500 ℃, it is subjected to long-term high-speed material flow impacts. When the furnace condition is not smooth, the maximum temperature can reach 700 ℃ or above, which will intensify material wear and erosion. Therefore, the material chute is prone to deformation and wear. Once the chute is severely worn or worn through, the small-sized coke used in the sintering mine first enters the furnace directly from the loophole, causing central accumulation, poor slag iron separation, more iron carried on the slag, a large amount of damage to the slag mouth, and the operation of the furnace will also be disrupted.
The service life of the fabric chute is related to the reliability of the entire bellless furnace top equipment. To ensure the service life of the chute and reduce manufacturing costs, it has become an essential manufacturing method to weld wear-resistant alloys on the surface of the lining plate of its working face. Chutes are constantly subjected to material impact at high temperatures, resulting in severe wear and tear. The harsh working conditions place high demands on wear-resistant alloys, so selecting appropriate welding materials is particularly important.
In the hardness test, the Rockwell hardness of the wear-resistant welding wire after heat treatment at 850 ℃ is above 55, which is 95.0% of that at room temperature. The wear amount after heat treatment is very low, with a relative wear amount of 5.6 times that of high chromium cast iron. It has excellent wear resistance and no weld layer detachment phenomenon was observed in the impact detachment test. Based on the results of hardness and wear tests, it can be concluded that the material has excellent comprehensive performance, indicating that it is suitable for the welding of chute lining plates. It is recommended to use this material.
