1. Cast in bucket teeth
The base metal in the cast-in-place bucket teeth is generally high manganese steel with high toughness, and the insert block is high chromium cast iron. When it is used to excavate ore with F = 16 ~ 18 on an electric shovel with a bucket capacity of 4m3, its service life is 2.44 times that of high manganese steel. Fuxin Mining Institute adopts high chromium cast iron to insert high manganese steel bucket teeth, which prolongs its service life by 50%. The manufacturing method of Taiyuan Heavy Machinery Factory is to insert a whole piece of high chromium cast iron (containing about 15% chromium) or tic and WC Cemented Carbide into the head of the bucket teeth when pouring the bucket teeth, so as to improve the wear resistance of the bucket teeth.
2. Surfacing bucket teeth
The characteristic of wear-resistant surfacing is to weld a layer of wear-resistant alloy on the surface of high manganese steel, carbon steel or alloy steel parts with certain strength and toughness, which not only reduces the requirements for bucket tooth base material, but also reduces the material cost. When high manganese steel is used as base material, high chromium cast iron alloy is generally overlaid on its surface. A layer of chromium molybdenum electrode or cemented carbide is overlaid on the tooth tip of high manganese steel, which is suitable for mining soft ore or ore with medium hardness. The bucket teeth of domestic excavators are mostly made of medium carbon low alloy steel. It is best to carry out wear-resistant surfacing before use. Generally, high chromium alloy cast iron and martensitic alloy cast iron surfacing electrodes are better. In recent years, laser surfacing has attracted much attention. It combines the laser surfacing layer with the matrix metallurgy, refines the structure, and can realize selective surfacing.
3. Cast infiltration bucket teeth
Casting infiltration is also known as surface alloying or coating and coating casting. The service life of bucket teeth of excavators produced by this method in Russia has been extended by more than 50%.