how to confirm the bucket tooth pin is insert casting piece or not?

　　Firstly: famous brands bucket tooth pin manufacturer said the surface color for these insert casting bucket tooth pin is not evenness and uniform, for example, the around color of insert casting bucket tooth pin is light gray color, but its center part has the more darkness color, and the position, which has covered up must be the insert part.

　　Secondly: expect of different appearance, famous brands bucket tooth pin manufacturer said the second method is confirm on the harden testing data, for example, the harden degree for these insert casting bucket tooth pin would has a big tolerance on two sides of boundary line, and the sealing part must be the insert part, the around part can be regard as basic body.

　　Lastly: the actual mechanical performance of metal material is depends on different metal element content and heat treatment technology, so famous brands bucket tooth pin manufacturer said if the element content is similar, but the harden degree has a big difference, it means this insert casting bucket tooth pin is not produced by heat treatment anymore.